2024/02/09 更新

写真a

タネ マサカズ
多根 正和
TANE Masakazu
担当
大学院工学研究科 機械系専攻 教授
工学部 機械工学科
職名
教授
所属
工学研究院
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担当・職階

  • 大学院工学研究科 機械系専攻 

    教授  2022年04月 - 継続中

  • 工学部 機械工学科 

    教授  2022年04月 - 継続中

取得学位

  • 博士(工学) ( 大阪大学 )

研究分野

  • ナノテク・材料 / 構造材料、機能材料

研究キーワード

  • マイクロメカニックス

  • 統計ゆらぎ

  • 結晶弾性論

  • 相転移

  • 力学特性

  • オメガ変態(無拡散等温オメガ変態)

  • チタン合金

  • 単結晶

研究概要

  • 構造・機能材料の力学および相転移現象

所属学協会

  • 日本鉄鋼協会

      国内

  • 日本金属学会

      国内

  • 日本機械学会

      国内

  • 軽金属学会

      国内

委員歴(学外)

  • 委託講師   国立大学法人大阪大学  

    2023年10月 - 2024年03月 

  • 講演大会委員会委員   日本金属学会  

    2019年04月 - 継続中 

  • 委員   日本金属学会 会誌・欧文誌編集委員会  

    2016年04月 - 2021年03月 

  • 委員   日本金属学会 会報編集委員会  

    2015年04月 - 2017年04月 

  • 専門調査員   文部科学省 科学技術政策研究所 科学技術動向研究センター  

    2015年04月 - 2016年03月 

  • 委員   日本学術振興会 加工プロセスによる材料新機能発現 第176委員会  

    2011年10月 - 2020年03月 

  • 委員   日本学術振興会 合金状態図 第172委員会  

    2011年08月 - 2021年03月 

▼全件表示

受賞歴

  • Acta Materialia and Scripta Materialia Outstanding Reviewer award

    Masakazu Tane

    2021年02月  

  • 第78回 日本金属学会功績賞

    多根 正和

    2020年03月   日本金属学会  

  • 大阪大学賞(若手教員部門)

    多根 正和

    2017年11月   大阪大学  

  • 第38回 本多記念研究奨励賞

    多根 正和

    2017年05月   公益財団法人 本多記念会  

  • 第13回 村上奨励賞

    多根 正和

    2016年09月   日本金属学会  

  • 優秀発表賞 H27年度シンクロLPSO合宿研究会

    多根 正和

    2016年09月   新学術領域研究 「シンクロ型LPSO構造の材料科学 ‐次世代軽量構造材料への革新的展開‐」  

  • 優秀発表賞 H25年度シンクロLPSO中間報告会

    多根 正和

    2013年09月   新学術領域研究 「シンクロ型LPSO構造の材料科学 ‐次世代軽量構造材料への革新的展開‐」  

  • 大阪大学総長奨励賞

    多根 正和

    2013年08月   大阪大学  

  • 優秀発表賞 H24年度 研究成果報告会

    多根 正和

    2013年03月   新学術領域研究 「シンクロ型LPSO構造の材料科学 ‐次世代軽量構造材料への革新的展開‐」  

  • 大阪大学総長奨励賞(研究部門)

    多根 正和

    2012年08月   大阪大学   「微細組織および形態制御と平均場理論の構築による金属材料の力学機能性の研究」

  • 最優秀ポスター賞

    宋 榮換, 多根 正和, 中嶋 英雄

    2012年03月   グローバルCOEプログラム「構造・機能先進材料デザイン教育研究拠点」   ロータス金属における高ひずみ速度圧縮下でのプラトー領域の発現メカニズムの解明

  • 論文賞

    宋 榮換, 多根 正和, 中嶋 英雄

    2012年02月   グローバルCOEプログラム「構造・機能先進材料デザイン教育研究拠点」  

  • 論文賞

    多根 正和, 中野 貴由, 倉本 繁, 原 昌司, 新家 光雄, 武末 尚久, 矢野 壮, 中嶋 英雄

    2012年02月   グローバルCOEプログラム「構造・機能先進材料デザイン教育研究拠点」   Low Young's Modulus in Ti-Nb-Ta-Zr-O Alloys: Cold Working and Oxygen Effects

  • Excellence Award of Poster Presentation

    T. B. Kim, M. Tane, S. Suzuki, T. Ide, H. Utsunomiya, H. Nakajima

    2011年01月   The 12th International Symposium on Eco-materials Processing and Design  

  • 論文賞

    多根 正和, 秋田 真吾, 中野 貴由, 萩原 幸司, 馬越 祐吉, 新家 光雄, 中嶋 英雄

    2009年03月   グローバルCOEプログラム「構造・機能先進材料デザイン教育研究拠点」   Peculiar elastic behavior of Ti-Nb-Ta-Zr single crystals

  • 第11回 優秀ポスター賞 (2008年日本金属学会 秋期講演大会)

    橘 孝洋, 中野 貴由, 萩原 幸司, 馬越 佑吉, 井手 拓哉, 多根 正和, 中嶋 英雄

    2008年09月   日本金属学会   変形モード制御によるポーラス材料の新たな可能性

  • 第2回 Joint JIM/TMS Young Leader International Scholar

    多根 正和

    2008   日本金属学会  

  • 最優秀ポスター賞

    多根 正和, 中嶋 英雄, 中野 貴由, 萩原 幸司, 馬越 祐吉

    2007年03月   21世紀COEプログラム「構造・機能先進材料デザイン研究拠点の形成」   弾性率測定に基づいたβ型Ti-Nb-Ta-Zr合金の相安定性と変形モードとの相関関係の解明

  • 第16回 日本金属学会奨励賞

    多根 正和

    2006年09月   日本金属学会  

  • 最優秀ポスター賞

    関 宏範, 多根 正和, 中嶋 英雄

    2006年03月   21世紀COEプログラム「構造・機能先進材料デザイン研究拠点の形成」  

  • 最優秀ポスター賞

    井手拓哉, 多根 正和, 中嶋 英雄

    2006年03月   21世紀COEプログラム「構造・機能先進材料デザイン研究拠点の形成」   ロータス型ポーラス金属間化合物の作製と機械的性質

▼全件表示

職務経歴(学外)

  • 国立研究開発法人科学技術振興機構   戦略的創造研究推進事業個人研究   さきがけ研究者 (兼任)

    2019年10月 - 継続中

  • 大阪大学   大学院工学研究科 マテリアル生産科学専攻   招聘教授

    2022年01月 - 継続中

  • 大阪大学   産業科学研究所    招聘教授

    2021年06月 - 2022年03月

  • 大阪市立大学   大学院工学研究科 機械物理系専攻   教授

    2021年04月 - 2022年03月

  • 東北大学   金属材料研究所   客員准教授

    2017年10月 - 2018年03月

  • 大阪大学   産業科学研究所   准教授

    2010年04月 - 2021年03月

  • 大阪大学   産業科学研究所   助教

    2007年04月 - 2010年03月

  • 大阪大学   産業科学研究所   助手

    2004年04月 - 2007年03月

▼全件表示

学歴

  • 大阪大学   基礎工学研究科   博士課程後期   卒業・修了

    2002年04月 - 2004年03月

  • 大阪大学   基礎工学研究科   博士課程前期   卒業・修了

    2000年04月 - 2002年03月

  • 大阪大学   基礎工学部     卒業・修了

    1996年04月 - 2000年03月

論文

  • Effects of aluminum and oxygen additions on quenched-in compositional fluctuations, dynamic atomic shuffling, and their resultant diffusionless isothermal ω transformation in ternary Ti–V-based alloys with bcc structure 査読

    Masakazu Tane, Hiroki Nishio, Daisuke Egusa, Taisuke Sasaki, Eiji Abe, Eisuke Miyoshi, Shota Higashino

    Acta Materialia   255   119034-1 - 119034-13   2023年06月

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    担当区分:筆頭著者, 責任著者   掲載種別:研究論文(学術雑誌)   国際・国内誌:国際誌  

    DOI: 10.1016/j.actamat.2023.119034

    DOI: 10.1016/j.actamat.2023.119034

  • Nanocomposite microstructures dominating anisotropic elastic modulus in carbon fibers (vol 166, pg 75, 2019) 査読

    Tane Masakazu, Okuda Haruki, Tanaka Fumihiko

    ACTA MATERIALIA   172   200 - 201   2019年06月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.actamat.2019.04.048

  • Diffusionless isothermal omega transformation in titanium alloys driven by quenched-in compositional fluctuations 査読

    Masakazu Tane, Hiroki Nishiyama, Akihiro Umeda, Norihiko L. Okamoto, Koji Inoue, Martin Luckabauer, Yasuyoshi Nagai, Tohru Sekino, Takayoshi Nakano, Tetsu Ichitsubo

    AMER PHYSICAL SOC PHYSICAL REVIEW MATERIALS   3 ( 4 )   043604   2019年04月( ISSN:2475-9953

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    掲載種別:研究論文(学術雑誌)  

    In titanium alloys, the omega(hexagonal)-phase transformation has been categorized as either a diffusion-mediated isothermal transformation or an athermal transformation that occurs spontaneously via a diffusionless mechanism. Here we report a diffusionless isothermal omega transformation that can occur even above the omega transformation temperature. In body-centered cubic beta-titanium alloyed with beta-stabilizing elements, there are locally unstable regions having fewer beta-stabilizing elements owing to quenched-in compositional fluctuations that are inevitably present in thermal equilibrium. In these locally unstable regions, diffusionless isothermal omega transformation occurs even when the entire beta region is stable on average so that athermal omega transformation cannot occur. This anomalous, localized transformation originates from the fluctuation-driven localized softening of 2/3[111](beta) longitudinal phonon, which cannot be suppressed by the stabilization of beta phase on average. In the diffusionless isothermal and athermal omega transformations, the transformation rate is dominated by two activation processes: a dynamical collapse of {111}(beta) pairs, caused by the phonon softening, and a nucleation process. In the diffusionless isothermal transformation, the omega-phase nucleation, resulting from the localized phonon softening, requires relatively high activation energy owing to the coherent beta/omega interface. Thus, the transformation occurs at slower rates than the athermal transformation, which occurs by the widely spread phonon softening. Consequently, the nucleation probability reflecting the beta/omega interface energy is the rate-determining process in the diffusionless omega transformations.

    DOI: 10.1103/PhysRevMaterials.3.043604

  • Impact of grain shape on the micromechanics-based extraction of single-crystalline elastic constants from polycrystalline samples with crystallographic texture 査読

    Masakazu Tane, Keisuke Yamori, Tohru Sekino, Tsuyoshi Mayama

    PERGAMON-ELSEVIER SCIENCE LTD Acta Materialia   122   236 - 251   2017年01月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

    A micromechanics-based method ("inverse self-consistent approximation") that can extract all the independent elastic constants of single crystals from those of polycrystals with crystallographic texture was newly developed. In the developed method, all the elastic constants in an anisotropic polycrystal were measured by resonant ultrasound spectroscopy, and the crystallographic orientations and shapes of the grains were analyzed. Then, the elastic constants of a single crystal, which reproduce those of the polycrystal, were determined on the basis of Eshelby's inclusion theory and the effective-medium approximation, taking into account the elastic interaction between the grains, which reflects their shapes and orientations. The developed method determined the elastic constants of pure Cu and pure Mg single crystals from those of polycrystals quite precisely. The differences between the elastic constants obtained using our method and the values measured using single crystals were only similar to 1%. In contrast, the application of an inverse Voigt-Reuss-Hill approximation, which cannot consider the effect of the grain shape on the elastic interaction, resulted in a relatively poor evaluation for pure single-crystalline Cu which exhibits strong elastic anisotropy. This indicates that the grain shape clearly affects the elastic interaction between the grains exhibiting high elastic anisotropy and influences the extracted single crystalline elastic constants. In terms of the actual application of the inverse self-consistent approximation, the single-crystalline elastic constants of AZ31 Mg alloy, whose single crystals cannot be prepared easily, were clarified. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.actamat.2016.09.040

  • Elastic-modulus enhancement during room-temperature aging and its suppression in metastable Ti-Nb-Based alloys with low body-centered cubic phase stability 査読

    M. Tane, K. Hagihara, M. Ueda, T. Nakano, Y. Okuda

    PERGAMON-ELSEVIER SCIENCE LTD Acta Materialia   102   373 - 384   2016年01月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

    Changes in the elastic properties during room-temperature aging (RT aging) of metastable Ti-Nb-based alloy single crystals with low body-centered cubic (bcc)-phase stability were investigated. The elastic stiffness components of Ti-Nb-Ta-Zr alloys with different Nb concentrations were measured by resonant ultrasound spectroscopy during RT aging; the results revealed that shear moduli c' and c(44) were increased by RT aging. In the alloy with the lowest Nb concentration, i.e., with the lowest bcc phase stability, shear moduli c' and c44 were enhanced by the largest amount. The increase rates were similar to 5% for 1.1 x 10(7) s (127 days), whereas the bulk modulus was hardly changed by aging. In Ti-Nb-Ta-Zr-O alloys with different oxygen concentrations, shear moduli cl and c44 of the alloy with the lowest oxygen concentration increased most significantly. Moreover, the electrical resistivity of Ti-Nb-Ta-Zr and Ti-Nb-Ta-Zr-O alloys was increased by RT aging. Importantly, the enhancements of shear moduli and electrical resistivity were suppressed by increases in the bcc-phase stability (i.e., increase in the Nb concentration) and oxygen concentration; these factors are known to suppress omega (hexagonal) phase formation. However, transmission electron microscopy (TEM) observations revealed that only a diffuse or structure-an omega-like lattice distortion-was formed after RT aging. On the basis of alloying element effects, TEM observations, and analysis of the changes in elastic properties by using a micromechanics model, it was deduced that the enhancements of shear moduli and electrical resistivity were possibly caused by the formation of a diffuse omega structure. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.actamat.2015.09.030

  • A comprehensive review of the elastic constants of carbon fibers: implications for design and manufacturing of high-performance composite materials 査読

    F. Tanaka, H. Ishikawa, M. Tane

    Advanced Composite Materials   2023年08月

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    担当区分:最終著者   掲載種別:研究論文(学術雑誌)   国際・国内誌:国際誌  

    DOI: 10.1080/09243046.2023.2245210

  • Toward Tungsten Electrodeposition at Moderate Temperatures Below 100° C Using Chloroaluminate Ionic Liquids 査読

    Shota Higashino, Yoshikazu Takeuchi, Masao Miyake, Takuma Sakai, Takumi Ikenoue, Masakazu Tane, Tetsuji Hirato

    Journal of The Electrochemical Society   170 ( 5 )   052501   2023年05月

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    掲載種別:研究論文(学術雑誌)   国際・国内誌:国際誌  

    DOI: 10.1149/1945-7111/accfc4

  • Change in elastic properties during room-temperature aging in body-centered cubic Mg-Li and Mg-Li-Al single crystals 査読 国際共著

    Ruxia Liu, Shota Higashino, Koji Hagihara, Lianmeng Zhang, Tohru Sekino, Masakazu Tane

    Journal of Materials Science & Technology   109   49 - 53   2022年05月

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)   共著区分:共著   国際・国内誌:国際誌  

  • Tungsten(II) chloride hydrates with high solubility in chloroaluminate ionic liquids for the electrodeposition of Al–W alloy films 査読

    Shota Higashino, Yoshikazu Takeuchi, Masao Miyake, Takumi Ikenoue, Masakazu Tane, Tetsuji Hirato

    Journal of Electroanalytical Chemistry   912   2022年05月( ISSN:15726657

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.jelechem.2022.116238

  • Elastic isotropy originating from heterogeneous interlayer elastic deformation in a Ti3SiC2 MAX phase with a nanolayered crystal structure 査読 国際共著

    Ruxia Liu, Masakazu Tane, Hajime Kimizuka, Yuji Shirakami, Ken-ichi Ikeda, Seiji Miura, Koji Morita, Tohru S. Suzuki, Yoshio Sakka, Lianmeng Zhang, Tohru Sekino

    Journal of the European Ceramic Society   41 ( 4 )   2278 - 2289   2021年04月( ISSN:0955-2219

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   共著区分:共著   国際・国内誌:国際誌  

    DOI: 10.1016/j.jeurceramsoc.2020.11.026

  • Evolution of microstructure and variations in mechanical properties accompanied with diffusionless isothermal ω transformation in β-titanium alloys 査読

    Norihiko L. Okamoto, Shuhei Kasatani, Martin Luckabauer, Robert Enzinger, Satoshi Tsutsui, Masakazu Tane, Tetsu Ichitsubo

    American Physical Society (APS) Physical Review Materials   4 ( 12 )   2020年12月( ISSN:2475-9953

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  • Effects of solute oxygen on kinetics of diffusionless isothermal ω transformation in β-titanium alloys 査読

    Norihiko L. Okamoto, Shuhei Kasatani, Martin Luckabauer, Masakazu Tane, Tetsu Ichitsubo

    Elsevier BV Scripta Materialia   188   88 - 91   2020年11月( ISSN:1359-6462

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.scriptamat.2020.07.005

  • Nanocomposite microstructures dominating anisotropic elastic modulus in carbon fibers 査読

    M. Tane, H. Okuda, F. Tanaka

    Acta Materialia   166   75 - 84   2019年03月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.actamat.2018.12.029

  • Superior energy absorption in porous magnesium: contribution of texture development triggered by intra-granular misorientations 査読

    T. Mayama, M. Tane, Y. Tadano

    Acta Materialia   165   62 - 72   2019年02月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.actamat.2018.11.037

  • Effect of Crystallographic Orientation, Grain Shape, and Elastic Anisotropy on X-ray Stress Factor in Polycrystals with Crystallographic Textures 査読

    Masakazu Tane

    Iron and Steel Institute of Japan Tetsu-to-Hagane   105 ( 11 )   1080 - 1089   2019年( ISSN:0021-1575

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    掲載種別:研究論文(学術雑誌)   共著区分:単著  

    DOI: 10.2355/tetsutohagane.tetsu-2019-052

  • Self-Activated surface dynamics in gold catalysts under reaction environments 査読

    Naoto Kamiuchi, Keju Sun, Ryotaro Aso, Masakazu Tane, Takehiro Tamaoka, Hideto Yoshida, Seiji Takeda

    Nature Publishing Group Nature Communications   9 ( 1 )   2060   2018年12月( ISSN:2041-1723

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    掲載種別:研究論文(学術雑誌)  

    Nanoporous gold (NPG) with sponge-like structures has been studied by atomic-scale and microsecond-resolution environmental transmission electron microscopy (ETEM) combined with ab initio energy calculations. Peculiar surface dynamics were found in the reaction environment for the oxidation of CO at room temperature, involving residual silver in the NPG leaves as well as gold and oxygen atoms, especially on {110} facets. The NPG is thus classified as a novel self-Activating catalyst. The essential structure unit for catalytic activity was identified as Au-AgO surface clusters, implying that the NPG is regarded as a nano-structured silver oxide catalyst supported on the matrix of NPG, or an inverse catalyst of a supported gold nanoparticulate (AuNP) catalyst. Hence, the catalytically active structure in the gold catalysts (supported AuNP and NPG catalysts) can now be experimentally unified in low-Temperature CO oxidation, a step forward towards elucidating the fascinating catalysis mechanism of gold.

    DOI: 10.1038/s41467-018-04412-4

  • Crystal plasticity analysis of anisotropic deformation behavior of porous magnesium with oriented pores 査読

    T. Mayama, M. Tane, Y. Tadano

    Journal of Physics: Conference Series   1063   012047   2018年08月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1088/1742-6596/1063/1/012047

  • Insignificant elastic-modulus mismatch and stress partitioning in two-phase Mg–Zn–Y alloys comprised of α-Mg and long-period stacking ordered phases 査読

    Masakazu Tane, Shogo Suzuki, Michiaki Yamasaki, Yoshihito Kawamura, Koji Hagihara, Hajime Kimizuka

    Elsevier BV Materials Science and Engineering: A   710   227 - 239   2018年01月( ISSN:0921-5093

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.msea.2017.10.069

  • Formation of metastable phases in Zr-ion-irradiated Al2O3 upon thermal annealing 査読

    Naomasa Oka, Manabu Ishimaru, Masakazu Tane, Younes Sina, Carl J. McHargue, Kurt E. Sickafus, Eduardo Alves

    OXFORD UNIV PRESS Microscopy   66 ( 6 )   388 - 396   2017年12月( ISSN:2050-5698

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    掲載種別:研究論文(学術雑誌)  

    Formation of metastable phases in Zr-ion-irradiated corundum alumina (Al2O3) upon thermal annealing was examined using transmission electron microscopy. A metastable cubic spinel phase was formed in the topmost layer of the as-irradiated microstructure. During thermal annealing at temperatures ranging from 1073 to 1273 K, this spinel layer grew in extent via an unusual corundum-to-spinel phase transformation. A normal spinel-to-corundum phase transformation was observed at post-irradiation annealing temperatures greater than 1473 K. In addition, ZrO2 nanocrystals embedded in alpha-Al2O3 were observed to form at these higher temperatures. High-resolution transmission electron microscopy observations and electron diffraction experiments revealed that the structure of the ZrO2 precipitates observed in this study are consistent with a high-pressure metastable orthorhombic phase of ZrO2 known as the Ortho-I phase.

    DOI: 10.1093/jmicro/dfx028

  • Two distinct crystallization processes in supercooled liquid 査読

    Masakazu Tane, Hajime Kimizuka, Tetsu Ichitsubo

    AMER INST PHYSICS Journal of Chemical Physics   144 ( 19 )   194505   2016年05月( ISSN:0021-9606

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    掲載種別:研究論文(学術雑誌)  

    Using molecular dynamics simulations we show that two distinct crystallization processes, depending on the temperature at which crystallization occurs, appear in a supercooled liquid. As a model for glass-forming materials, an Al2O3 model system, in which both the glass transition and crystallization from the supercooled liquid can be well reproduced, is employed. Simulations in the framework of an isothermal-isobaric ensemble indicate that the calculated time-temperature-transformation curve for the crystallization to gamma(defect spinel)-Al2O3 exhibited a typical nose shape, as experimentally observed in various glass materials. During annealing above the nose temperature, the structure of the supercooled liquid does not change before the crystallization, because of the high atomic mobility (material transport). Thus, the crystallization is governed by the abrupt crystal nucleation, which results in the formation of a stable crystal structure. In contrast, during annealing below the nose temperature, the structure of the supercooled liquid gradually changes before the crystallization, and the formed crystal structure is less stable than that formed above the nose temperature, because of the restricted material transport. Published by AIP Publishing.

    DOI: 10.1063/1.4949329

  • Effects of stacking sequence and short-range ordering of solute atoms on elastic properties of Mg-Zn-Y alloys with long-period stacking ordered structures 査読

    M. Tane, H. Kimizuka, K. Hagihara, S. Suzuki, T. Mayama, T. Sekino, Y. Nagai

    PERGAMON-ELSEVIER SCIENCE LTD ACTA MATERIALIA   96   170 - 188   2015年09月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

    The effects of stacking sequence and short-range ordering of solute atoms on the elastic properties of Mg-Zn-Y alloy single crystals with an 18R- or 10H-type long-period stacking ordered (LPSO) structure were studied. Instead of single crystals, the growth of which can be quite difficult, two directionally solidified (DS) Mg-Zn-Y alloy polycrystals, mainly consisting of 18R- or 10H-type LPSO structure, were prepared. X-ray pole figure analyses revealed that fiber textures, which differed in the two prepared alloys, were formed in the DS polycrystals. For the DS polycrystals, a complete set of elastic constants was measured during cooling from 300 to 7.5 or 5.5 K. By analyzing the elastic stiffness of DS polycrystals on the basis of a newly developed inverse Voigt-Reuss-Hill approximation, in which the detailed crystallographic texture could be taken into account, the elastic stiffness components of the single-crystalline LPSO phases from 300 to 7.5 or 5.5 K were determined. The elastic properties of the 18R- and 10H-LPSO phases were also evaluated by first-principles calculations based on density functional theory. Comparison of the measured elastic properties at 5.5 or 7.5 K with the first-principles calculations revealed that the elastic properties of the LPSO phase were virtually dominated by the stacking sequence of the LPSO structures and the formation energy of short-range ordered solute atom clusters, formed at the four consecutive atomic stacking layers. Importantly, the effects of the formation energy and stacking sequence were significant in the elastic moduli related to the atomic bonding between the stacking layers. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.actamat.2015.06.005

  • Corrigendum to “Elastic properties of single-crystalline ω phase in titanium” [Acta Materialia 61 (2013) 7543–7554] 査読

    M. Tane, Y. Okuda, Y. Todaka, H. Ogi, A. Nagakubo

    Elsevier BV Acta Materialia   84   515 - 515   2015年02月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.actamat.2014.11.006

  • Effect of crystallographic texture on mechanical properties in porous magnesium with oriented cylindrical pores 査読

    M. Tane, T. Mayama, A. Oda, H. Nakajima

    PERGAMON-ELSEVIER SCIENCE LTD ACTA MATERIALIA   84   80 - 94   2015年02月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

    The tensile and compressive deformation in porous Mg with unidirectionally oriented cylindrical pores and a unique fiber texture in which the normal direction of the {10 $(1) over bar $3} plane was preferentially oriented was studied. Porous Mg specimens with unidirectional pores and texture were prepared by unidirectional solidification in a hydrogen atmosphere using a continuous-casting technique and their quasi-static tensile deformation and quasi-static and dynamic compressions were investigated. In tensile loading parallel to the orientation direction of the pores (the "pore direction"), the porous Mg exhibited a large tensile elongation of similar to 60% strain despite the presence of, similar to 42% porosity, whereas it showed high energy absorption of similar to 30 kJ kg(-1) along the same direction. To clarify these superior mechanical properties, the underlying operative deformation modes and rotation of crystallographic orientation during loadings were analyzed by X-ray pole figures, optical microscopy and crystal plasticity finiteelement modeling. The analyses revealed that in the initial stage of both the compression and tensile loadings along the pore direction, basal slip mainly operated. Importantly, the activity of basal slip was enhanced during the tensile loading by rotation of the crystallographic orientation, which resulted in high tensile elongation. On the other hand, the activation of basal slip was initially suppressed by the crystal rotation during compression. However, the localization of basal slip originating from the elongated grains with the unique texture subsequently enhanced the activity of basal slip, which suppressed the steep increase in the flow stress. This unique localized deformation gave rise to the superior impact energy absorption. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.actamat.2014.10.024

  • Crystallographic nature of deformation bands shown in Zn and Mg-based long-period stacking ordered (LPSO) phase 査読

    Koji Hagihara, Michiaki Yamasaki, Masahito Honnami, Hitoshi Izuno, Masakazu Tane, Takayoshi Nakano, Yoshihito Kawamura

    TAYLOR & FRANCIS LTD PHILOSOPHICAL MAGAZINE   95 ( 2 )   132 - 157   2015年01月( ISSN:1478-6435

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    掲載種別:研究論文(学術雑誌)  

    Formation of curious deformation bands has been reported as one of the deformation mechanisms occurring in an Mg-based long-period stacking ordered (LPSO) phase. The origin of the deformation band is still unknown, and the possibility of the deformation kink band and/or the deformation twin has been discussed. To clarify this, the crystallographic nature of deformation bands formed in the LPSO phase was examined by scanning electron microscope-electron backscatter diffraction (SEM-EBSD) pattern analysis. The results were compared to those of the deformation kink bands formed in hcp-Zn and deformation twins formed in hcp-Mg polycrystals. The deformation bands in the LPSO phase was confirmed not to exhibit a fixed crystal orientation relationship with respect to the matrix, different from the case shown in the deformation twin. Instead, the deformation band in the LPSO phase showed three arbitrariness on its crystallographic nature: an ambiguous crystal rotation axis that varied on the [0001] zone axis from band to band; an arbitral crystal rotation angle that was not fixed and showed relatively wide distributions; and a variation in crystal rotation angle depending on the position even within a deformation band boundary itself. These features were coincident with those observed in the deformation bands formed in Zn polycrystals, suggesting that the formed deformation bands in LPSO phase crystals are predominantly deformation kink bands.

    DOI: 10.1080/14786435.2014.987843

  • 六方晶系材料にて観察される変形帯の特徴 査読

    本浪雅史, 萩原幸司, 伊津野仁史, 多根正和, 山崎倫昭, 眞山剛, 中野貴由, 河村能人

    第58回 日本学術会議材料工学連合講演会 講演論文集   2014年10月

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    掲載種別:研究論文(学術雑誌)  

  • Diffusion of oxygen in amorphous Al2O3, Ta2O5, and Nb2O5 査読

    R. Nakamura, T. Toda, S. Tsukui, M. Tane, M. Ishimaru, T. Suzuki, H. Nakajima

    AMER INST PHYSICS JOURNAL OF APPLIED PHYSICS   116 ( 3 )   33504 (8 pages)   2014年07月( ISSN:0021-8979

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    掲載種別:研究論文(学術雑誌)  

    The self-diffusivity of oxygen in amorphous Al2O3 (a-Al2O3), a-Ta2O5, and a-Nb2O5 was investigated along with structural analysis in terms of pair distribution function (PDF). The low activation energy, similar to 1.2 eV, for diffusion in the oxides suggests a single atomic jump of oxygen ions mediated via vacancy-like defects. However, the pre-exponential factor for a-Ta2O5 and a-Nb2O5 with lower bond energy was two orders of magnitude larger than that for a-Al2O3 with higher bond energy. PDF analyses revealed that the short-range configuration in a-Ta2O5 and a-Nb2O5 was more broadly distributed than that in a-Al2O3. Due to the larger variety of atomic configurations of a-Ta2O5 and a-Nb2O5, these oxides have a higher activation entropy for diffusion than a-Al2O3. The entropy term for diffusion associated with short-range structures was shown to be a dominant factor for diffusion in amorphous oxides. (C) 2014 AIP Publishing LLC.

    DOI: 10.1063/1.4889800

  • Formation mechanism of a plateau stress region during dynamic compression of porous iron: Interaction between oriented cylindrical pores and deformation twins 査読

    M. Tane, F. Zhao, Y.H. Song, H. Nakajima

    Elsevier BV Materials Science and Engineering: A   591   150 - 158   2014年01月( ISSN:0921-5093

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.msea.2013.10.078

  • Elastic properties of single-crystalline ω phase in titanium 査読

    M. Tane, Y. Okuda, Y. Todaka, H. Ogi, A. Nagakubo

    Acta Materialia   61 ( 20 )   7543 - 7554   2013年12月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.actamat.2013.08.036

  • Elastic properties of an Mg–Zn–Y alloy single crystal with a long-period stacking ordered structure 査読

    M. Tane, Y. Nagai, H. Kimizuka, K. Hagihara, Y. Kawamura

    Acta Materialia   61 ( 17 )   6338 - 6351   2013年10月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.actamat.2013.06.041

  • Effect of Solidification Condition and Alloy Composition on Formation and Shape of Pores in Directionally Solidified Ni-Al Alloys 査読

    Takuya Ide, Masakazu Tane, Hideo Nakajima

    SPRINGER METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   44A ( 9 )   4257 - 4265   2013年09月( ISSN:1073-5623

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    掲載種別:研究論文(学術雑誌)  

    The effect of the solidification condition and alloy composition on the formation of cylindrical pores oriented along the solidification direction was investigated in Ni(100-x)Al (x) (x = 20, 25, 30, and 50 at. pct) alloys that were solidified unidirectionally in hydrogen atmosphere. It was revealed that the uniformity of the pores strongly correlates with the width of the mushy zone (i.e., the region of solid-liquid coexistence) in the solidification front. In alloys with x = 25 and 50 (i.e., NiAl and Ni3Al intermetallic compounds, respectively), uniform cylindrical pores were formed, reflecting small freezing intervals, which lead to narrow mushy zones. On the other hand, irregular pores were formed in x = 20 and 30 two-phase alloys comprising Ni solid-solution and Ni3Al phases and Ni3Al and NiAl phases, respectively, that had large freezing intervals leading to wide mushy zones. This is because the large amount of primary crystals with dendritic structures prevents the growth of directional pores in the mushy zone. For the x = 20 and 30 alloys, the increase in the temperature gradient of the solidification front, which decreases the mushy zone width, clearly enhances the uniformity of the pores. Consequently, decreasing the mushy zone width results in the growth of uniform cylindrical pores.

    DOI: 10.1007/s11661-013-1790-z

  • ω Transformation in Cold Worked Ti-Nb-Ta-Zr-O Alloys with Low Body-centered Cubic Phase Stability and Its Correlation with Their Elastic Properties 査読

    M. Tane, T. Nakano, S. Kuramoto, M. Niinomi, N. Takesue, H. Nakajima

    Acta Materialia   61 ( 1 )   139 - 150   2013年01月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.actamat.2012.09.041

  • Pore formation and compressive deformation in porous TiAl-Nb alloys containing directional pores 査読

    F. Yang, M. Tane, J. P. Lin, Y. H. Song, H. Nakajima

    Elsevier Ltd Materials and Design   49   755 - 760   2013年( ISSN:1873-4197

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    掲載種別:研究論文(学術雑誌)  

    Porous Ti-xAl-8Nb (x=45, 48, and 49at%) alloys (i.e., intermetallic TiAl-Nb compounds) with cylindrical pores oriented along a single direction were prepared via unidirectional solidification in a hydrogen and helium gas atmosphere, while making use of the differences in the hydrogen solubilities of the liquid and solid phases of the alloys. The microstructures and pore morphologies of the alloys revealed that pore formation in the alloys was closely related to their solidification processes. In the case of the alloy with x=45at%, a primary solidified β (bcc) phase with high hydrogen solubility suppressed the formation of pores during solidification. On the other hand, in the case of the alloy with x=49at%, the formation of the primary β phase was suppressed, leading to the formation of elongated pores along the solidification direction. After being heat treated, the porous TiAl-Nb alloys exhibited a fully lamellar structure composed of α2-Ti3Al and γ-TiAl phases. These porous TiAl-Nb alloys with lamellar structures and directional pores exhibited superior compressive properties parallel to the direction of the pores. © 2013 Elsevier Ltd.

    DOI: 10.1016/j.matdes.2013.02.031

  • Compressive properties of lotus-type porous iron 査読

    Matej Vesenjak, Aljaz Kovacic, Masakazu Tane, Matej Borovinsek, Hideo Nakajima, Zoran Ren

    ELSEVIER SCIENCE BV COMPUTATIONAL MATERIALS SCIENCE   65   37 - 43   2012年12月( ISSN:0927-0256

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    掲載種別:研究論文(学術雑誌)  

    Lotus-type porous materials exhibit some unique anisotropic mechanical and thermal properties which are very useful for a number of industrial applications. This paper evaluates several computational models for determining the compressive engineering elastic modulus and engineering yield stress of lotus-type iron in transversal and longitudinal direction in regard to pore orientation with parametric nonlinear finite element computational simulations for porosities ranging from 0 to 0.65. The considered pore topologies of evaluated computational models are either regular (indirectly reconstructed) or irregular (directly reconstructed). Comparison of computational results, experimental tests and analytical estimations shows good correlation of some evaluated computational models. The simplified porous model with pi/4 rotated aligned regular pores can be recommended for fast computational estimation of lotus-type material behaviour under mechanical loading, when some material parameters for homogenised lotus-type material modelling have to be determined. Crown Copyright (c) 2012 Published by Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.commatsci.2012.07.004

  • Biocompatible low Young's modulus achieved by strong crystallographic elastic anisotropy in Ti-15Mo-5Zr-3Al alloy single crystal 査読

    S. -H. Lee, M. Todai, M. Tane, K. Hagihara, H. Nakajima, T. Nakano

    ELSEVIER SCIENCE BV JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS   14   48 - 54   2012年10月( ISSN:1751-6161

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    掲載種別:研究論文(学術雑誌)  

    The elastic anisotropy of the Ti-15Mo-5Zr-3Al (mass%) beta-Ti alloy, an ISO certified biomedical material, was investigated using its single crystal. It was revealed that the Young's modulus exhibited pronounced anisotropy. The Young's modulus was reduced to 44.4 GPa along the < 100 > direction in the Ti-15Mo-5Zr-3Al single crystal, that is comparable to that of human cortical bones. We determined the strategy that beta-Ti alloys with extremely low moduli can be developed by reducing the electron-atom (e/a) ratio in alloys, and by suppressing the formation of the omega-phase at the same time. This new knowledge must lead to the development of "single crystalline beta-Ti implant materials" as hard tissue replacements for reducing the stress shielding effect. (C) 2012 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jmbbm.2012.05.005

  • On the Anisotropy of Lotus-Type Porous Copper 査読

    Thomas Fiedler, Christoph Veyhl, Irina Veniaminovna Belova, Masakazu Tane, Hideo Nakajima, Timo Bernthaler, Markus Merkel, Andreas Oechsner, Graeme Elliott Murch

    WILEY-V C H VERLAG GMBH ADVANCED ENGINEERING MATERIALS   14 ( 3 )   144 - 152   2012年03月( ISSN:1438-1656

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    掲載種別:研究論文(学術雑誌)  

    This paper addresses the thermal and mechanical properties of lotus-type porous copper. Due to their cellular metal characteristics in combination with strong anisotropy, lotus-type materials exhibit unique properties. As an example, directional thermal conduction enables the controlled transport of thermal energy in the pore direction without the need of strong thermal insulation. In this paper, thermal and mechanical finite element analyses are performed. The effective thermal conductivity, Young's modulus, and the 0.2%-offset yield strength are determined. Special consideration is given to the anisotropy of the material. In order to guarantee accurate discretization of the complex material geometry, calculation models are directly based on computed microtomography data. Elastic properties are compared to experimental data and good agreement is found. For the characterization of the thermal anisotropy, a second numerical approach, called the Lattice Monte Carlo method, is used along with thermal finite element analysis. In addition to the numerical methods, the analytical Maxwell, Dulynev, and Bruggeman models are applied. Good agreement for the application of two-dimensional versions of Dulynev's and Bruggeman models is observed whereas the Maxwell model significantly overestimates the material properties.

    DOI: 10.1002/adem.201100205

  • Dynamic and quasi-static compression of porous carbon steel S30C and S45C with directional pores 査読

    Y. H. Song, M. Tane, H. Nakajima

    ELSEVIER SCIENCE SA MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   534   504 - 513   2012年02月( ISSN:0921-5093

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    掲載種別:研究論文(学術雑誌)  

    Dynamic and quasi-static compressive deformation of as-cast and normalized porous S30C and S45C carbon steels with unidirectional cylindrical pores was investigated to evaluate the effect of matrix brittleness on the appearance of a plateau stress region where deformation proceeds with almost no stress increase. Dynamic compression tests were carried out at room (298 K) and cryogenic (77 K) temperatures using the split Hopkinson pressure bar method, and quasi-static compression tests were carried out at room temperature using universal testing machine. Compression perpendicular to the orientation of the pores does not generate a plateau stress region, regardless of the matrix brittleness, which depends on the strain rate, temperature, carbon content, and heat-treatment conditions. Localized deformation and crack formation originating from a high concentration of stress around the pores during perpendicular compression promote densification in the early stage of the stress-strain curves, thereby precluding the appearance of the plateau stress region. On the other hand, a plateau stress region appears during compression parallel to the orientation of the pores. The appearance of the plateau stress region is, however, limited when rapid crack propagation and large work hardening are suppressed by the ductility of the matrix and the formation of deformation bands, which originate from the intermediate brittleness of the matrix metal and anisotropic pores. The appearance of the plateau stress region confers a high-energy absorption capacity on the as-cast porous carbon steel S45C, with an absorbed energy value of 86.8 +/- 1.6 kJ kg(-1), which is ten times higher than that of aluminum foams with isotropic pores. The energy absorption efficiency reaches 85.9 +/- 6.8%, which is almost the same as that of the aluminum foams. (C) 2011 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.msea.2011.11.099

  • Peculiar formation mechanism of a plateau stress region during dynamic compressive deformation of porous carbon steel with oriented cylindrical pores 査読

    Y. H. Song, M. Tane, H. Nakajima

    PERGAMON-ELSEVIER SCIENCE LTD ACTA MATERIALIA   60 ( 3 )   1149 - 1160   2012年02月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

    Dynamic and quasi-static compressive deformation of as-cast and normalized porous S15CK carbon steels with cylindrical pores oriented in one direction was investigated at 298 and 77 K, using the split Hopkinson pressure bar method and a universal testing machine, combined with an acoustic emission measurement system, to clarify the formation mechanism of a plateau stress region where deformation proceeds with almost no stress increase. Dynamic and quasi-static compressions perpendicular to the orientation of the pores at 298 and 77 K do not produce a plateau stress region in the as-cast and normalized porous S15CK, because the localized crack formation and slip deformation that originate from the large concentration of stress around pores promotes densification in the early stage of the stress-strain curves. When the samples undergo dynamic compression parallel to the pore direction at 77 K, the matrix becomes brittle, and cracks are easily formed. However, the pores do not easily collapse, because they are oriented along the compressive direction. Therefore, densification occurs at a higher strain level. In addition, the formation of small cracks in the matrix decreases the work hardening rate. As a result, a plateau stress region with high stress amplitude and wide strain range appears, which is independent of the microstructure. This mechanism for the formation of the plateau stress region is completely different from that of metal foams with isotropic pores, which is based on sequential inhomogeneous deformation. As a result, energy absorption 10 times that of commercial aluminum foams is achieved. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.actamat.2011.11.001

  • Anisotropic Dynamic Compressive Properties of Lotus-type Porous Carbon Steel 査読

    Y. H. Song, M. Tane, H. Nakajima

    GS INTERVISION POROUS METALS AND METALLIC FOAMS, METFOAM 2011   469 - 472   2012年

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    掲載種別:研究論文(学術雑誌)  

    Dynamic and quasi-static compressive deformation of lotus-type porous carbon steel S15CK (lotus S15CK) with cylindrical pores elongated in one direction was investigated. In the quasi-static and dynamic compressions parallel and perpendicular to the pore direction, a clear plateau stress region does not appear. However, in the dynamic parallel compression, the rate of increase in the flow stress is rather low in the strain range of similar to 5-50%. Therefore, the efficiency of absorbed energy is comparable to that of conventional aluminum foams, and the absorbed energy is ten times higher than that of conventional aluminum foams. This is because the cylindrical pores parallel to the compressive direction suppress the stress concentration around pores and the densification in early stage of compression.

  • Elastic Properties of Nanoporous Amorphous Al2O3 査読

    M. Tane, S. Nakano, R. Nakamura, H. Ogi, M. Ishimaru, H. Kimizuka, H. Nakajima

    GS INTERVISION POROUS METALS AND METALLIC FOAMS, METFOAM 2011   637 - 640   2012年

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    掲載種別:研究論文(学術雑誌)  

    Amorphous Al2O3 thin films containing nanovoids were fabricated through the annealing of amorphous Al2O3 thin films that were prepared by an electron beam deposition method. The elastic properties of nanoporous amorphous Al2O3 thin films were measured by a picosecond laser ultrasound method, which clarified that the elastic stiffness drastically increased after the annealing despite nanovoid formation; this increase indicate a change in the amorphous structure during the annealing.

  • Low Young’s modulus in Ti-Nb-Ta-Zr-O alloys: Cold working and oxygen effects 査読

    M. Tane, T. Nakano, S. Kuramoto, M. Hara, M. Niinomi, N. Takesue, T. Yano, H. Nakajima

    PERGAMON-ELSEVIER SCIENCE LTD Acta Materialia   59 ( 18 )   6975 - 6988   2011年10月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

    The origin of the low Young's modulus of cold worked Ti-36Nb-2Ta-3Zr-xO mass% polycrystals with a body-centered cubic (beta-phase) structure, referred to as gum metal, was investigated with a focus on the roles of oxygen concentration, the electron-atom (e/a) ratio, and the cold working process. Analysis of the temperature dependence of the microstructures and elastic properties of single crystals at x = 0.09, 0.36, 0.51% O using transmission electron microscopy and an electromagnetic acoustic resonance method, respectively, revealed that the shear moduli c' and c(44) of the 0.36 and 0.51% O alloys softened upon cooling near room temperature (RT) and exhibited low values at RT. This was because suppression of the alpha '' martensitic transformation by oxygen addition led to retention of the low stability single beta-phase state at RT. The Hill approximation indicated that the low c' and c(44) values caused by softening gave rise to the low Young's modulus, which is common to some Ti-Nb-based alloys with an c/a ratio of similar to 4.24. Analysis of the microstructures and elastic properties of solution-treated and cold worked x = 0.06, 0.30, 0.47% O alloy polycrystals at RT revealed that the Young's modulus increased upon 90% cold working due to formation of the alpha '' martensite phase (0.09% O) and omega phase (0.09, 0.30, and 0.47% O) with a high elastic modulus in the beta-phase matrix. However, increasing the oxygen concentration suppresses the increase in Young's modulus because oxygen addition decreases the amount of alpha '' and omega phases formed while retaining the low stability beta phase. Therefore, cold working combined with oxygen addition produces a low Young's modulus compatible with high strength. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.actamat.2011.07.050

  • Enhancement of nanovoid formation in annealed amorphous Al2O3 including W 査読

    R. Nakamura, M. Ishimaru, A. Hirata, K. Sato, M. Tane, H. Kimizuka, T. Shudo, T. J. Konno, H. Nakajima

    AMER INST PHYSICS JOURNAL OF APPLIED PHYSICS   110 ( 6 )   2011年09月( ISSN:0021-8979

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    掲載種別:研究論文(学術雑誌)  

    The effect of W on the nanovoid formation in annealed amorphous Al2O3 was studied by transmission electron microscopy and molecular dynamics simulations. A comparison of the void formation behavior in electron-beam deposited Al2O3 (without W) and resistance-heating deposited Al2O3 (with 10 at. % W) revealed that W enhances the formation and growth of nanovoids. An analysis of the pair distribution function (PDF) in both types of amorphous Al2O3 showed that the introduction of W into amorphous Al2O3 brings about a significant change in the amorphous structure. Furthermore, it was found by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) that sub-nm sized W clusters exist in as-deposited Al2O3 prepared by resistance-heating and then dissolve in the amorphous matrix with annealing. The combination of PDF analysis and HAADF-STEM observation provides evidence that the enhancement of void formation originates in the heterogeneous short-range atomic configurations induced by the addition of W. (C) 2011 American Institute of Physics. [doi:10.1063/1.3639290]

    DOI: 10.1063/1.3639290

  • Nanovoid formation by change in amorphous structure through the annealing of amorphous Al2O3 thin films 査読

    M. Tane, S. Nakano, R. Nakamura, H. Ogi, M. Ishimaru, H. Kimizuka, H. Nakajima

    PERGAMON-ELSEVIER SCIENCE LTD ACTA MATERIALIA   59 ( 11 )   4631 - 4640   2011年06月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

    The formation mechanism of a high density of nanovoids by annealing amorphous Al2O3 thin films prepared by an electron beam deposition method was investigated. Transmission electron microscopy observations revealed that nanovoids similar to 1-2 nm in size were formed by annealing amorphous Al2O3 thin films at 973 K for 1-12 h, where the amorphous state was retained. The elastic stiffness, measured by a picosecond laser ultrasound method, and the density, measured by X-ray reflectivity, increased drastically after the annealing process, despite nanovoid formation. These increases indicate a change in the amorphous structure during the annealing process. Molecular dynamics simulations indicated that an increase in stable AlO6 basic units and the change in the ring distribution lead to a drastic increase in both the elastic stiffness and the density. It is probable that a pre-annealed Al2O3 amorphous film consists of unstable low-density regions containing a low fraction of stable AlO6 units and stable high-density regions containing a high fraction of stable AlO6 units. Thus, local density growth in the unstable low-density regions during annealing leads to nanovoid formation (i.e., local volume shrinkage). (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.actamat.2011.04.008

  • Appearance of a plateau stress region during dynamic compressive deformation of porous carbon steel with directional pores 査読

    Y. H. Song, M. Tane, H. Nakajima

    PERGAMON-ELSEVIER SCIENCE LTD SCRIPTA MATERIALIA   64 ( 8 )   797 - 800   2011年04月( ISSN:1359-6462

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    掲載種別:研究論文(学術雑誌)  

    The dynamic compression behavior of porous carbon steels with cylindrical pores oriented in one direction was investigated. The application of dynamic compression parallel to the orientation of the pores at 77 K resulted in the formation of a plateau stress region, in which considerable impact energy is absorbed. The amount of energy absorbed is 10 times that of commercial aluminum foams. Plateau stress regions appear when crack propagation is suppressed, suggesting a starkly different mechanism from that of metal foams. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.scriptamat.2011.01.006

  • Strength and pore morphology of porous aluminum and porous copper with directional pores deformed by equal channel angular extrusion 査読

    T. B. Kim, M. Tane, S. Suzuki, H. Utsunomiya, T. Ide, H. Nakajima

    ELSEVIER SCIENCE SA MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   528 ( 6 )   2363 - 2369   2011年03月( ISSN:0921-5093

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    掲載種別:研究論文(学術雑誌)  

    Porous aluminum with a porosity of 17.6% and porous copper with a porosity of 39.7% (the pores of both aluminum and copper were cylindrical and oriented in one direction) were deformed by equal channel angular extrusion using a 150 degrees die with sequential 180 degrees rotations (route C), and the mechanical strength and pore morphology after the extrusions were investigated. In the case of porous aluminum with low porosity, the pores were collapsed by the extrusions that were both parallel and perpendicular to the orientation direction of the pores. In contrast, the porosity of porous copper decreased slightly after extrusions that were parallel to the orientation direction of the pores, and the pores thus remained even after four extrusions. The yield strength after the second extrusion was 7.3 times greater than it was before the extrusion, even though there was a decrease in porosity of only 8%. On the other hand, almost all the pores of the porous copper collapsed after the fourth extrusion, when the extrusion direction was perpendicular to the orientation direction of the pores. Thus, the yield stress cannot be enhanced without being accompanied by progressive densification. 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.msea.2010.12.051

  • Anisotropic Tensile Deformation of Lotus-type Porous Copper 査読

    Masakazu Tane, Rika Okamoto, Hideo Nakajima

    TRANS TECH PUBLICATIONS LTD ECO-MATERIALS PROCESSING AND DESIGN XII   695   545 - 548   2011年( ISSN:0255-5476

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    掲載種別:研究論文(学術雑誌)  

    The tensile deformation of lotus-type porous copper with cylindrical pores oriented in one direction was investigated. Deformation was occured homogeneously in the copper matrix for loadings parallel to the orientation direction of pores (pore direction), while deformation was localized in the matrix around pores for loadings perpendicular to the pore direction. In the case of parallel loading the decrease in cross section of tensile specimen was smaller than that of nonporous copper, because of the constant-volume law (i.e. incompressibility condition) for deformation was not applicable to the deformation of pores. In the case of perpendicular loading, the deformed regions were disconnected and constant-volume law holds only in the matrix around the pores, and thus, the cross section hardly decreases during the tensile deformation.

    DOI: 10.4028/www.scientific.net/MSF.695.545

  • Improvement of Strength of Lotus-type Porous Aluminum through ECAE Process 査読

    Tae Bum Kim, Masakazu Tane, Shinsuke Suzuki, Takuya Ide, Hiroshi Utsunomiya, Hideo Nakajima

    TRANS TECH PUBLICATIONS LTD ECO-MATERIALS PROCESSING AND DESIGN XII   695   263 - +   2011年( ISSN:0255-5476

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    掲載種別:研究論文(学術雑誌)  

    Lotus-type porous aluminum with cylindrical pores oriented in one direction was deformed by Equal Channel Angular Extrusion (ECAE) through a 150 degrees die with sequential 180 degrees rotations, and the pore morphology and Vickers hardness after the extrusion were investigated. The Vickers hardness increases with increasing number of passes in the extrusions both parallel and perpendicular to the pore direction, accompanied by the decrease of porosity. The densification occurs more easily in the perpendicular extrusions than in the parallel extrusions, and the large deformation by the densification gives rise to the large increase in the Vickers hardness for the perpendicular extrusions.

    DOI: 10.4028/www.scientific.net/MSF.695.263

  • Low Young’s modulus of Ti–Nb–Ta–Zr alloys caused by softening in shear moduli c′ and c44 near lower limit of body-centered cubic phase stability 査読

    M. Tane, S. Akita, T. Nakano, K. Hagihara, Y. Umakoshi, M. Niinomi, H. Mori, H. Nakajima

    Elsevier BV Acta Materialia   58 ( 20 )   6790 - 6798   2010年12月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

    The composition and temperature dependence of the elastic properties and phase stability of quaternary Ti-Nb-Ta-Zr beta-phase alloys with a body-centered cubic structure, developed for biomedical applications, were investigated using their single crystals, in order to clarify the origin of the low Young's modulus in polycrystals. Transmission electron microscopy observations clarified that alpha '' martensitic transformation occurred in a temperature range that depended on the beta-phase stability below room temperature. Electromagnetic acoustic resonance measurements clarified that the shear moduli c' and c(44) of single crystals softened upon cooling from room temperature and became rather low near the martensitic transformation start temperature, i.e. the lower limit of beta-phase stability. An analysis by the Hill approximation indicates that low c' and c(44) caused the low Young's modulus, and thus it is probable that the softening in c' and c(44) is the origin of the low Young's modulus. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.actamat.2010.09.007

  • Pore Morphology of Porous Al-Ti Alloy Fabricated by Continuous Casting in Hydrogen Atmosphere 査読

    T. B. Kim, M. Tane, S. Suzuki, H. Nakajima

    JAPAN INST METALS MATERIALS TRANSACTIONS   51 ( 10 )   1871 - 1877   2010年10月( ISSN:1345-9678

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    掲載種別:研究論文(学術雑誌)  

    Porous Al 5 mass%Ti alloy was fabricated by unidirectional solidification in hydrogen atmosphere using a continuous casting technique The porous Al Ti alloy was prepared at different transfer (solidification) velocities and the effect of transfer velocity on the pore morphology was investigated It was found that the pore shape changes with increasing transfer velocity while the porosity does not change with increasing transfer velocity In the case of a low transfer velocity (0 5 mm min(-1)) elongated pores surrounded by the columnar microstructure are formed which indicates that the pores grow along the solidification direction together with the solid phase In the case of a middle transfer velocity (5 0 mm min(-1)) elongated pores surrounded by the columnar microstructure and needle or plate like Al3Ti alloys are formed In the case of a high transfer velocity (10 0 mm min(-1)) spherical pores surrounded by the equiaxed microstructure are formed because the primary crystals formed in the solidification front prevent the growth of elongated pores It is suggested that the pore morphology is closely related with the solidification rate [doi 10 2320/matertrans M2010223]

    DOI: 10.2320/matertrans.M2010223

  • Tensile deformation of anisotropic porous copper with directional pores 査読

    M. Tane, R. Okamoto, H. Nakajima

    MATERIALS RESEARCH SOC JOURNAL OF MATERIALS RESEARCH   25 ( 10 )   1975 - 1982   2010年10月( ISSN:0884-2914

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    掲載種別:研究論文(学術雑誌)  

    The tensile deformation of anisotropic porous copper with unidirectionally oriented cylindrical pores was investigated by an acoustic emission method. In the loadings parallel and perpendicular to the orientation direction of the pores, many cracks are formed after yielding and they strongly affect the deformation. The formed cracks rapidly grow and connect with each other near the peak stress of the stress strain curve, thereby leading to final fracture. Crack formation is easier under perpendicular loading than under parallel loading, because high stress concentration and stress triaxiality occurs around the pores. As a result, the strength and elongation for perpendicular loading are much smaller than those for parallel loading. Furthermore, in the case of perpendicular loading, the localized deformation around pores drastically decreases the plastic Poisson's ratio. These results indicate that a porous copper macroscopically behaves as a semibrittle material under perpendicular loading, while the porous copper exhibits ductility under parallel loading.

    DOI: 10.1557/JMR.2010.0261

  • Fabrication of Al-3.7 Pct Si-0.18 Pct Mg Foam Strengthened by AlN Particle Dispersion and its Compressive Properties 査読

    Yeong Hwan Song, Masakazu Tane, Takuya Ide, Yoshihiro Seimiya, Bo Young Hur, Hideo Nakajima

    SPRINGER METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   41A ( 8 )   2104 - 2111   2010年08月( ISSN:1073-5623

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    掲載種別:研究論文(学術雑誌)  

    Al-3.7 pct Si-0.18 pct Mg foams strengthened by AlN particle dispersion were prepared by a melt foaming method, and the effect of foaming temperature on the foaming behavior was investigated. Al-3.7 pct Si-0.18 pct Mg alloy containing AlN particles was prepared by noncompressive infiltration of Al powder compacts with molten Al alloy in nitrogen atmosphere, and it was foamed at different foaming temperatures ranging from 1023 to 1173 K. The porosity of prepared foam decreases and the pore structure becomes homogeneous with increasing foaming temperature. When the foaming temperature is higher than 1123 K, homogeneous pores are formed in the prepared ingot without using oxide particles and metallic calcium granules, which are usually used for stabilizing a foaming process. This stabilization of the foaming at high temperatures is possibly caused by Al3Ti intermetallic compounds formed at high temperature and AlN particles. Compression tests for the prepared foams revealed that the absorbed energy per unit mass of prepared Al-3.7 pct Si-0.18 pct Mg foam is higher than those of aluminum foams strengthened by alloying or dispersion of reinforcements. It is remarkable that the oscillation in stress, which usually appears in strengthened aluminum foams, does not appear in the plateau stress region of the present Al-3.7 pct Si-0.18 pct Mg foam. The homogeneity in cell walls and pore morphology due to the stabilization of pore formation and growth by AlN and Al3Ti particles is a possible cause of this smooth plateau stress region.

    DOI: 10.1007/s11661-010-0247-x

  • アコースティックエミッション法を用いたロータス型ポーラス銅の変形挙動の解析 査読

    岡本理佳, 多根正和, 中嶋英雄

    銅と銅合金   49 ( 1 )   190 - 193   2010年08月

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    掲載種別:研究論文(学術雑誌)  

  • Strain rate dependence of anisotropic compression behavior in porous iron with unidirectional pores 査読

    Masakazu Tane, Tae Kawashima, Hiroyuku Yamada, Keitaro Horikawa, Hidetoshi Kobayashi, Hideo Nakajima

    CAMBRIDGE UNIV PRESS JOURNAL OF MATERIALS RESEARCH   25 ( 6 )   1179 - 1190   2010年06月( ISSN:0884-2914

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    掲載種別:研究論文(学術雑誌)  

    The strain rate dependence of anisotropic compression behavior in porous iron with cylindrical pores oriented in one direction was investigated. Through high strain rate (similar to 10(3) s(-1)) compression tests along the orientation direction of pores using the split Hopkinson pressure bar method, it was shown that the stress-strain curve exhibits a unique plateau-stress region where deformation proceeds with almost no stress increase. The appearance of the plateau-stress region is related to the buckling deformation of the iron matrix and provides superior energy absorption. However, for the middle (similar to 10(-1) s(-1)) and low strain rates (similar to 10(-4) s(-1)), compression along the same direction produces no such plateau region. In fact, in contrast to compression in the parallel direction, compression perpendicular to the orientation direction of pores produces no plateau-stress regions in any of the three strain rates.

    DOI: 10.1557/JMR.2010.0147

  • Properties of lotus-type Porous Metals 査読

    H. Nakajima, M. Tane

    Encyclopedia of Materials: Science and Technology   2010年01月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/B978-008043152-9.02241-7

  • Dynamic Compression Behavior of Lotus-type Porous Iron 査読

    Masakazu Tane, Tae Kawashima, Keitaro Horikawa, Hidetoshi Kobayashi, Hideo Nakajima

    TRANS TECH PUBLICATIONS LTD ECO-MATERIALS PROCESSING AND DESIGN XI   658   193 - +   2010年( ISSN:0255-5476

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    掲載種別:研究論文(学術雑誌)  

    Dynamic and quasi-static compression tests were conducted on lotus-type porous iron with porosity of about 50% using the split Hopkinson pressure bar method and universal testing machine, respectively. In the dynamic compression parallel to the pore direction, a plateau stress region appears where deformation proceeds at nearly constant stress, while the plateau stress region does not appear in the quasi-static compression. The plateau stress region is probably caused by the buckling deformation of matrix iron which occurs only in the dynamic compression. In contrast, the compression perpendicular to the orientation direction of pores exhibits no plateau-stress regions in the both dynamic and quasi-static compression.

    DOI: 10.4028/www.scientific.net/MSF.658.193

  • Elastic and Plastic Deformation Behaviors of Lotus-type Porous Copper 査読

    Masakazu Tane, Hideo Nakajima

    TRANS TECH PUBLICATIONS LTD ECO-MATERIALS PROCESSING AND DESIGN XI   658   332 - 335   2010年( ISSN:0255-5476

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    掲載種別:研究論文(学術雑誌)  

    The elastic and plastic deformation behaviors of lotus-type porous copper (lotus copper) with cylindrical pores oriented in one direction were investigated using two acoustic methods (resonant ultrasound spectroscopy and acoustic emission method). All the independent components of elastic stiffness were determined by resonant ultrasound spectroscopy combined with electromagnetic acoustic resonance method, which revealed that the Young's modulus exhibits the anisotropy originating from the anisotropic porous structure and anisotropic matrix texture. The porosity dependence of the anisotropic Young's modulus can be calculated by the micromechanics modeling based on effective-mean-field theory. The tensile deformation behavior of lotus copper was analyzed by acoustic emission method, which revealed that many burst acoustic emission signals are detected during the tensile deformation. This implies that many cracks are formed during the tensile deformation.

    DOI: 10.4028/www.scientific.net/MSF.658.332

  • Effect of Foaming Temperature on Pore Morphology of Al/AlN Composite Foam Fabricated by Melt Foaming Method 査読

    Yeong Hwan Song, Masakazu Tane, Takuya Ide, Yoshihiro Seimiya, Bo Young Hur, Hideo Nakajima

    TRANS TECH PUBLICATIONS LTD ECO-MATERIALS PROCESSING AND DESIGN XI   658   189 - +   2010年( ISSN:0255-5476

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    掲載種別:研究論文(学術雑誌)  

    Al foams whose matrix contains dispersed AlN particles (Al/AlN composite foams) were prepared by a melt foaming method, and the effect of foaming temperature on the pore morphology of the prepared foams was investigated. First, Al/AlN composites were prepared by non-compressive infiltration of Al powder compacts with molten Al alloy in nitrogen atmosphere. Next, the prepared composites were melted by induction heating and foamed at various temperatures using TiH2 powders as blowing agents. The porosity of prepared Al/AlN composite foams slightly decreases with increasing foaming temperature, and the pore morphology of the foam becomes homogeneous simultaneously. When the foaming temperature is 1123 K, homogeneous pores are formed in all over the ingot. This pore homogeneity is probably achieved by the stabilization of the foaming behavior due to the formation of Al3Ti particles in the melt and dispersion of AlN particles.

    DOI: 10.4028/www.scientific.net/MSF.658.189

  • Fabrication of lotus-type porous metals through thermal decomposition of compounds 査読

    H. Nakajima, M. Tane, S. Suzuki, S. Y. Kim

    The Minerals, Metals and Materials Society - 3rd International Conference on Processing Materials for Properties 2008   2009年12月

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    掲載種別:研究論文(学術雑誌)  

  • Fabrication of Lotus-Type Porous Aluminum Utilizing Decomposition of Moisture 査読

    Masakazu Tane, Hideo Nakajima

    JAPAN INST METALS MATERIALS TRANSACTIONS   50 ( 6 )   1477 - 1481   2009年06月( ISSN:1345-9678

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    掲載種別:研究論文(学術雑誌)  

    Lotus-type porous aluminum with cylindrical pores oriented in one direction was fabricated by a casting method utilizing the decomposition of moisture in a vacuum. Hydrogen decomposed from moisture is utilized for cylindrical pores to grow during unidirectional solidification. However, pores are not formed in the case of a casting in hydrogen or argon atmosphere, because hydrogen or argon gas pressure suppresses the pore growth. The porosity of lotus aluminum does not depend on the moisture amount, which indicates that the moisture amount is almost saturated within the amount used in this study. The average pore diameter does not depend on the moisture amount, because the pore diameter depends mainly on ambient pressure and solidification rate. The distribution of pores becomes homogeneous by decreasing melting temperature, because the rate of the reaction of moisture possibly becomes low (more suitable for pore growth) by decreasing the melting temperature. [doi:10.2320/matertrans.M2009032.]

    DOI: 10.2320/matertrans.M2009032

  • Compressive Deformation Behavior of Porous γ-TiAl with Directional Pores 査読

    T. Ide, M. Tane, H. Nakajima

    Materials Science and Engineering A   508 ( 1-2 )   220 - 225   2009年05月( ISSN:0921-5093

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.msea.2009.01.046

  • Anisotropic Mechanical Properties of Lotus-Type Porous Metals 査読

    H. Nakajima, M. Tane, S. K. Hyun, H. Seki

    SPRINGER IUTAM SYMPOSIUM ON MECHANICAL PROPERTIES OF CELLULAR MATERIALS   12   43 - 50   2009年

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    掲載種別:研究論文(学術雑誌)  

    The mechanical properties of lotus metals were experimentally investigated and the effect of the anisotropic pores on the mechanical properties was clarified. The mechanical strength in the direction parallel to the pore direction linearly decreases with increasing porosity, while that perpendicular to the pore direction drastically decreases. This is caused by the anisotropy of stress concentration. The porosity dependence of the mechanical strength obeys a power-law formula.

    DOI: 10.1007/978-1-4020-9404-0_6

  • Fabrication of lotus-type porous magnesium through thermal decomposition of magnesium hydride 査読

    M. Tane, H. Nakajima

    Institute of Physics Publishing Journal of Physics: Conference Series   165   2009年( ISSN:1742-6596

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    掲載種別:研究論文(学術雑誌)  

    Lotus-type porous magnesium was fabricated through thermal decomposition of MgH2 powders as a source of hydrogen. Liquid magnesium was cast into a mold in which MgH2 powders were placed and solidified unidirectionally in the mold, which achieved the growth of unidirectional elongated pores in magnesium matrix. The fabrication method is safer than a conventional method using pressurized hydrogen atmosphere, because the risk of explosion can be avoidable. The effect of the amount of MgH2 powders and the distance from the bottom of the ingot on the porous structure was investigated, which clarified that the two factors have the large influence on the pore growth. © 2009 IOP Publishing Ltd.

    DOI: 10.1088/1742-6596/165/1/012065

  • Peculiar elastic behavior of Ti-Nb-Ta-Zr single crystals 査読

    Tane M., Akita S., Nakano T., Hagihara K., Umakoshi Y., Niinomi M., Nakajima H.

    ACTA MATERIALIA   56 ( 12 )   2856 - 2863   2008年07月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.actamat.2008.02.017

  • Fabrication of porous magnesium with directional pores through use of hydrogen thermally decomposed from MgH2 powders during unidirectional solidification 査読

    Tane Masakazu, Nakajima Hideo

    JOURNAL OF MATERIALS RESEARCH   23 ( 3 )   849 - 855   2008年03月( ISSN:0884-2914

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1557/JMR.2008.0105

  • Thermal Property of Lotus-Type Porous Copper and Application to Heat Sinks 査読

    Tetsuro Ogushi, Hiroshi Chiba, Masakazu Tane, Hideo Nakajima

    John Wiley and Sons Cellular and Porous Materials: Thermal Properties Simulation and Prediction   239 - 265   2008年01月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/9783527621408.ch8

  • Fatigue crack initiation and propagation in lotus-type porous copper 査読

    Seki Hironori, Tane Masakazu, Nakajima Hideo

    MATERIALS TRANSACTIONS   49 ( 1 )   144 - 150   2008年01月( ISSN:1345-9678

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.2320/matertrans.MRA2007623

  • Effects of Pore Size Distribution and Loading Direction on Fatigue Property of Lotus-type Porous Copper 査読

    H. Seki, M. Tane, H. Nakajima

    DESTECH PUBLICATIONS, INC POROUS METALS AND METALLIC FOAMS: METFOAM 2007   237 - 240   2008年

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    掲載種別:研究論文(学術雑誌)  

    We studied the effect of pore size distribution and loading direction on fatigue property of lotus-type porous copper with anisotropic pore structure. The fatigue strength at finite life is closely related to its pore morphology. The strength depends on applied stress direction; the fatigue life is the longest in the direction parallel to the longitudinal axis of cylindrical pores. Abnormally large pores decrease the fatigue strength of lotus copper.

  • Fabrication and Plastic Deformation Behavior of Lamellar Ti-rich TiAl Crystals with Lotus-Type Aligned Pores 査読

    T. Nakano, T. Tachibana, K. Hagihara, Y. Umakoshi, T. Ide, M. Tane, H. Nakajima

    DESTECH PUBLICATIONS, INC POROUS METALS AND METALLIC FOAMS: METFOAM 2007   213 - +   2008年

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    掲載種別:研究論文(学術雑誌)  

    Ti-rich TiAl crystals are a promising candidate as light-weight and heat-resistant materials for aerospace and automobile applications.
    In this study, we fabricated Ti-48.0at.%Al (Ti-rich TiAl) crystals with lotus-type aligned pores, and examined the microstructure and plastic deformation behavior. We succeeded in obtaining the gamma/alpha(2) two-phase lamellar Ti-rich TiAl crystals with elongated pores aligned parallel to the heat transfer direction by the floating zone method under the pressure of hydrogen and helium mixed gas at a crystal growth :ate of 330 mu m/s. The as-grown and annealed crystals show a well-developed lamellar structure with a strict orientation relationship between the alpha(2) phase and six gamma variants in each grain. However, these crystals exhibit no strong texture of lamellar grains. The total pore volume and the mean pore diameter are approximately 52 % and 380 pm, respectively.
    The macro-yield stress strongly depends on the loading axis relative to the elongated pore. When the loading axis is parallel and perpendicular to the elongated pore direction, the yield stress obeys K=1 and 2.5, respectively, in the equation of sigma=sigma(0)(1-P)(kappa), where a is the macro-yield stress with pores, sigma(0) is the macro-yield stress without pores and P is the volume fraction of pores. The difference of K value, K=1 and 2.5, indicates the change in deformation manner, i.e. macroscopically homogeneous and locally heterogeneous plastic deformation, respectively. The plastic deformation behavior was also investigated at elevated temperatures up to 1273 K. The relatively high stress was maintained independent of the loading axis up to around 1073 K. The K value shows no strong temperature dependence because aligned pores give no change in deformation behavior at elevated temperatures.

  • Effects of anisotropic pore structure and fiber texture on fatigue properties of lotus-type porous magnesium 査読

    Seki H., Tane M., Nakajima H.

    JOURNAL OF MATERIALS RESEARCH   22 ( 11 )   3120 - 3129   2007年11月( ISSN:0884-2914

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1557/JMR.2007.0385

  • Effective-mean-field theory for electrical conductivity of multiphase composite materials 査読

    Tane Masakazu, Nakajima Hideo

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   46 ( 8A )   5221 - 5225   2007年08月( ISSN:0021-4922

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1143/JJAP.46.5221

  • ロータス型ポーラス銅の疲労強度に及ぼす気孔率および気孔径分布の影響 査読

    関 宏範, 多根正和, 中嶋英雄, 大塚正久

    銅と銅合金   46 ( 1 )   90 - 94   2007年08月

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    掲載種別:研究論文(学術雑誌)  

  • Three-dimensional image-based modeling of lotus-type porous carbon steel and simulation of its mechanical behavior by finite element method 査読

    T. Kujime, M. Tane, S. K. Hyun, H. Nakajima

    ELSEVIER SCIENCE SA MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   460   220 - 226   2007年07月( ISSN:0921-5093

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    掲載種別:研究論文(学術雑誌)  

    Lotus-type porous carbon steel with cylindrical pores was fabricated by the continuous zone melting method in pressurized hydrogen gas. A three-dimensional (3D) reconstruction of the microstructure of the lotus-type porous car bon steel was made by using an image-based modeling to simulate the mechanical behavior. The stress-strain behavior of the 3D models of the lotus-type porous carbon steel was predicted by using finite element method (FEM) and was compared with the experimental results. Until the strain reaches 0.05, the compressive stress of the predicted model reaches the almost same value of the experimental result. The tensile stress also reaches approximately 0.9 times value of the experimental result. (C) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.msea.2007.01.101

  • Effects of pore morphology on fatigue strength and fracture surface of lotus-type porous copper 査読

    H. Seki, M. Tane, M. Otsuka, H. Nakajima

    MATERIALS RESEARCH SOCIETY JOURNAL OF MATERIALS RESEARCH   22 ( 5 )   1331 - 1338   2007年05月( ISSN:0884-2914

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    掲載種別:研究論文(学術雑誌)  

    We studied the effect of anisotropic pore morphology on the fatigue behavior and fracture surface of lotus-type porous copper, which was fabricated through unidirectional solidification in pressurized hydrogen and argon atmospheres. The fatigue strength at finite life is closely related to the pore morphology. The fatigue strength decreases with increasing porosity, and the strength depends on applied-stress direction. The fatigue life is the longest in the direction parallel to the longitudinal axis of cylindrical pores. The fatigue strength at finite life is proportional to the ultimate tensile strength and can be expressed by a simple power-law formula. Anisotropic pores affect the fracture surface of lotus copper; crack-initiation site depends on applied-stress direction, and the anisotropic shape pores affect the direction of crack propagation and final fracture surface.

    DOI: 10.1557/JMR.2007.0164

  • 生体材料最適形状設計のための金属インプラント周囲ならびに一方向性孔内部に導入される新生骨の骨質評価 査読

    石本卓也, 中野貴由, 寒知子, 大橋芳夫, 藤谷渉, 馬越佑吉, 服部友一, 樋口裕一, 多根正和, 中嶋英雄

    日本金属学会誌   71 ( 4 )   432 - 438   2007年04月( ISSN:0021-4876

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.2320/jinstmet.71.432

  • Extended mean-field method for predicting yield behaviors of porous materials 査読

    Masakazu Tane, Tetsu Ichitsubo, Masahiko Hirao, Hideo Nakajima

    ELSEVIER SCIENCE BV MECHANICS OF MATERIALS   39 ( 1 )   53 - 63   2007年01月( ISSN:0167-6636

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    掲載種別:研究論文(学術雑誌)  

    We extend Qiu and Weng's mean-field approach for predicting yield behaviors of porous metals [J. Appl. Mech.-Trans. ASME 59, 261-268, 1992] in a more rigorous mathematical form. This extended method can explicitly take account of the pore morphology and the elastic and plastic anisotropies of metal matrix. The validity of our method is first demonstrated by applying to the lotus-type porous iron that exhibits the anisotropic yield behavior experimentally. We next consider the porous materials possessing elastically and plastically anisotropies, and carry out the calculations of their macroscopic yield behaviors. The calculations revealed that the yield stress is virtually independent of the elastic anisotropy of the matrix. but strongly depends on the plastic anisotropy and also on the pore morphology. (C) 2006 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.mechmat.2006.02.008

  • Fabrication of lotus-type porous metals by continuous zone melting and continuous casting techniques 査読

    H. Nakajima, S. K. Hyun, J. S. Park, M. Tane

    TRANS TECH PUBLICATIONS LTD THERMEC 2006, PTS 1-5   539-543   187 - +   2007年( ISSN:0255-5476

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    掲載種別:研究論文(学術雑誌)  

    Lotus-type porous metals with low thermal conductivity are fabricated by continuous zone melting technique, which possess directional elongated pores. The porous metals have been able to be fabricated through the conventional casting method by utilizing the solubility gap between solid and liquid in pressurized gas atmosphere. However, there is a shortcoming that the pores are coarsened in the part farther from the chill plate in the ingot. In order to overcome such a shortcoming, we developed the continuous zone melting technique and successfully produced the lotus-type porous metals with even low thermal conductivity such as stainless steel and superalloys. Furthermore, from the viewpoint of mass production with low cost, we invented novel "continuous casting technique". The molten metals dissolving gas are solidified continuously by passing through the mold cooled with chiller and thus, lotus-type porous metal plate as long as one meter was produced for short time. Sufficient uniformity of the porosity and pore size was obtained in such long porous ingots. This technique is prospective method for commercial mass production.

    DOI: 10.4028/www.scientific.net/MSF.539-543.187

  • ポーラス金属の作製と機能的特性 ロータス型ポーラス金属の物性および特性 3‐7 圧縮降伏応力(ロータス型ポーラスステンレス鋼) 査読

    井手拓哉, 多根正和, 池田輝之, 中嶋英雄

    ポーラス金属の作製と機能的特性 平成15−18年度   105-106   2007年

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    掲載種別:研究論文(学術雑誌)  

    J-GLOBAL

  • Pore morphology of lotus-type porous copper fabricated by continuous casting technique 査読

    J. S. Park, S. K. Hyun, M. Tane, H. Nakajima

    TRANS TECH PUBLICATIONS LTD ADVANCES IN NANOMATERIALS AND PROCESSING, PTS 1 AND 2   124-126   1725 - +   2007年( ISSN:1012-0394

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    掲載種別:研究論文(学術雑誌)  

    We investigated the pore morphology in lotus-type porous copper fabricated by continuous casting technique as a function of transference velocity range from 1 to 100 mm.min(-1) under hydrogen gas pressure of 1.0 MPa. Lotus-type porous copper with long cylindrical pores aligned in one direction parallel to the transference direction was fabricated, which posses a sufficient uniformity of the porosity and pore size. The pores formed at transference velocity of 1 mm.min(-1) were larger than other condition. Necks were observed in these pores, whose formation may be attributed to bubbling in the melt. The pore size decreased with increasing transference velocity, while the porosity was not varied much by transference velocity.

    DOI: 10.4028/www.scientific.net/SSP.124-126.1725

  • Microstructure and deformation behavior of lamellar Ti-rich TiAl crystal with lotus-type aligned pores 査読

    Takayoshi Nakano, Takahiro Tachibana, Koji Hagihara, Yukichi Umakoshi, Takuya Ide, Masakazu Tane, Hideo Nakajima

    TRANS TECH PUBLICATIONS LTD PRICM 6: SIXTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, PTS 1-3   561-565   383 - +   2007年( ISSN:0255-5476

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    掲載種別:研究論文(学術雑誌)  

    A porous Ti-48.0at.%Al (Ti-rich TiAl) crystal, in which lotus-type long cylindrical pores were aligned and (gamma/alpha(2)) two-phase lamellar structure was simultaneously developed, was fabricated by floating zone method under the pressure of hydrogen and helium mixed gas. Plastic deformation behavior and microstructure of the Ti-rich TiAl crystal with lotus-type aligned pores were investigated by focusing on the elongated pore direction. The as-grown and annealed crystals show a well-developed lamellar structure and no texture accompanied by 52% porosity and a mean pore diameter of 380 mu m. Yield stress strongly depends on the loading direction against the elongated pore. When loading directions are parallel and perpendicular to the pore direction, yield stresses obey K=1 and 2.5, respectively, in equation of sigma=sigma(0)(1-P)(K), where a is the yield stress with pores, sigma(0) is the yield stress without pores and p is porosity. This reflects macroscopically homogeneous and locally heterogeneous plastic deformation between pores, respectively.

    DOI: 10.4028/www.scientific.net/MSF.561-565.383

  • Fatigue strength of lotus-type porous magnesium 査読

    Hironori Seki, Masakazu Tane, Hideo Nakajima

    TRANS TECH PUBLICATIONS LTD PRICM 6: SIXTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, PTS 1-3   561-565   1681 - 1684   2007年( ISSN:0255-5476

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    掲載種別:研究論文(学術雑誌)  

    We studied the fatigue strength of lotus-type porous magnesium with cylindrical pores aligned unidirectionally, which was fabricated through unidirectional solidification in pressurized hydrogen atmospheres. The fatigue strength shows anisotropy; the fatigue strength in the direction parallel to the longitudinal axis of pores is higher than that in the perpendicular direction. Not only anisotropic pores but also fiber texture grown along the pore direction contributes to the anisotropy in the fatigue strength.

    DOI: 10.4028/www.scientific.net/MSF.561-565.1681

  • Fabrication of lotus-type porous NiTi shape memory alloys using the continuous zone melting method and tensile property 査読

    Sugiyama Masayuki, Hyun Soong-Keun, Tane Masakazu, Nakajima Hideo

    HIGH TEMPERATURE MATERIALS AND PROCESSES   26 ( 4 )   297 - 301   2007年( ISSN:0334-6455

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    掲載種別:研究論文(学術雑誌)  

  • Fabrication of lotus-type porous NiAl and Ni3Al intermetallic compounds 査読

    Takuya Ide, Masakazu Tane, Hideo Nakajima

    TRANS TECH PUBLICATIONS LTD ADVANCES IN NANOMATERIALS AND PROCESSING, PTS 1 AND 2   124-126   1721 - +   2007年( ISSN:1012-0394

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    掲載種別:研究論文(学術雑誌)  

    Lotus-type porous NiAl and Ni3Al intermetallic compounds, possessing cylindrical pores aligned in the direction parallel to the solidification direction, were fabricated by using a unidirectional solidification technique in a pressurized hydrogen atmosphere of 2.5MPa. The porosity of lotus NiAl is 24.2%, and the porosity of lotus Ni3Al is 3.2%; the porosity of the porous NiAl is larger than that of Ni3Al. This is because the solubility gap of hydrogen between liquid and solid phases of NiAl is larger than that of N(i)3Al.

    DOI: 10.4028/www.scientific.net/SSP.124-126.1721

  • Effect of pore morphology on compressive yield strength of lotus-type porous copper with various specimen sizes 査読

    Jae-Soung Park, Soong-Keun Hyun, Hidekazu Sueno, Masakazu Tane, Hideo Nakajima, Yong-Su Um, Bo-Young Hur, Fumio Ono

    JAPAN INST METALS MATERIALS TRANSACTIONS   47 ( 9 )   2208 - 2212   2006年09月( ISSN:1345-9678

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    掲載種別:研究論文(学術雑誌)  

    Lotus-type porous copper with long cylindrical pores aligned in one direction parallel to the solidification direction was fabricated by unidirectional solidification of the melt in a mixed gas of hydrogen and argon. Compression tests were performed in the direction parallel to the cylindrical pores in order to investigate the relationship between the specimen size and compressive yield strength. The compressive yield strengths and the standard deviation decrease with an increase in specimen size. Increments of the standard deviation are caused by the standard deviation of porosity occurred by inhomogeneous pore diameter and irregular pore arrangement.

    DOI: 10.2320/matertrans.47.2208

  • Size effects on tensile strength of lotus-type porous copper 査読

    Hidekazu Sueno, Masakazu Tane, Jae-Soung Park, Soong-Keun Hyun, Hideo Nakajima

    JAPAN INST METALS MATERIALS TRANSACTIONS   47 ( 9 )   2203 - 2207   2006年09月( ISSN:1345-9678

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    掲載種別:研究論文(学術雑誌)  

    Effects of specimen thickness on the tensile strength of lotus-type porous copper were investigated. The ultimate tensile strength in the direction perpendicular to the longitudinal axis of pores hardly depends on the thickness of a specimen when the width of the specimen is large enough compared with the pore diameter, while the ultimate tensile strength increases with an increase in the thickness when the width is not large enough compared with the pore diameter. The 0.2% offset strength in the direction and strain at the peak stress depend on the thickness of specimens; the 0.2% offset strength decreases with an increase in the thickness, and the strain at peak stress increases with the increase in the thickness.

    DOI: 10.2320/matertrans.47.2203

  • Prediction of the thermal properties of lotus-type and quasi-isotropic porous metals: Numerical and analytical methods 査読

    Andreas Ochsner, Masakazu Tane, Hideo Nakajima

    ELSEVIER SCIENCE BV MATERIALS LETTERS   60 ( 21-22 )   2690 - 2694   2006年09月( ISSN:0167-577X

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    掲載種別:研究論文(学術雑誌)  

    The geometrical effective thermal conductivity of different porous materials is investigated based on two different approaches: the finite element method as a representative for numerical approximation methods and the mean-field method as a representative for analytical methods. Different pore geometries, i.e., cylindrical and spherical, and different arrangements of these pores, namely in different periodic ways and random distribution are considered. It is found that the relative conductivity is practically independent of the specific pore arrangement. Only the morphology (spherical or cylindrical) of the structure influences the conductivity. (c) 2006 Elsevier B.V All rights reserved.

    DOI: 10.1016/j.matlet.2006.01.067

  • Influence of ultrasonic agitation on pore formation and growth during unidirectional solidification of water-carbon dioxide solution 査読

    Masakazu Tane, Hideo Nakajima

    JAPAN INST METALS MATERIALS TRANSACTIONS   47 ( 9 )   2183 - 2187   2006年09月( ISSN:1345-9678

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    掲載種別:研究論文(学術雑誌)  

    We studied the influence of agitation by ultrasonic vibration on pore formation and growth during the unidirectional solidification of watercarbon dioxide solution. The agitation of liquid affects the pore formation and growth, and the morphology of pores formed during solidification depends on the magnitude of agitation; the agitation ofliquid during unidirectional solidification shortens the length of cylindrical pores in lotus metals. This is because the agitation decreases the concentration of carbon dioxide near the solid-liquid interface.

    DOI: 10.2320/matertrans.47.2183

  • Fabrication of lotus-type porous Ni3Al with and without boron 査読

    Ide Takuya, Tane Masakazu, Hyun Soong-Keun, Nakajima Hideo

    MATERIALS TRANSACTIONS   47 ( 9 )   2116 - 2119   2006年09月( ISSN:1345-9678

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.2320/matertrans.47.2116

  • Evaluation of elastic and thermoelastic properties of lotus-type porous metals via effective-mean-field theory 査読

    M Tane, SK Hyun, H Nakajima

    PERGAMON-ELSEVIER SCIENCE LTD SCRIPTA MATERIALIA   54 ( 4 )   545 - 552   2006年02月( ISSN:1359-6462

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    掲載種別:研究論文(学術雑誌)  

    The effective-mean-field (EMF) theory, consisting of Mori-Tanaka's mean-field theory and Bruggeman's effective medium approximation. was extended in order to calculate the coefficients of thermal expansion (CTE) of composite materials. The effective elastic constants and CTE of lotus-type porous metals, possessing cylindrical pores aligned unidirectionally, were evaluated with the EMF theory. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.scriptamat.2005.10.049

  • Vibration-damping capacity of lotus-type porous magnesium 査読

    ZK Xie, M Tane, SK Hyun, Y Okuda, H Nakajima

    ELSEVIER SCIENCE SA MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   417 ( 1-2 )   129 - 133   2006年02月( ISSN:0921-5093

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    掲載種別:研究論文(学術雑誌)  

    Lotus-type porous magnesium with cylindrical pores aligned unidirectionally was fabricated by the unidirectional solidification of molten magnesium under pressurized hydrogen atmosphere. The apparent attenuation coefficient of the free vibration of lotus-type porous magnesium was measured by hammering-vibration-damping tests, which revealed that the apparent attenuation coefficient increases with increase in porosity, i.e., the damping capacity of lotus magnesium is higher than that of non-porous magnesium. The mechanism of high damping capacity was analyzed by using the Fourier transform technique, which revealed that various vibration modes of high frequency are excited by a hammering. The excited vibrations of high frequency enhance the damping capacity of lotus-type porous magnesium. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.msea.2005.10.061

  • Compressive properties of lotus-type porous stainless steel 査読

    Ide T, Tane M, Ikeda T, Hyun SK, Nakajima H

    JOURNAL OF MATERIALS RESEARCH   21 ( 1 )   185 - 193   2006年01月( ISSN:0884-2914

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    掲載種別:研究論文(学術雑誌)  

  • Effect of porosity on fatigue strength of lotus-type porous copper 査読

    H Seki, S Yamazaki, M Otsuka, M Tane, SK Hyun, H Nakajima

    TRANS TECH PUBLICATIONS LTD ECO-MATERIALS PROCESSING & DESIGN VII   510-511   966 - 969   2006年( ISSN:0255-5476

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    掲載種別:研究論文(学術雑誌)  

    Tension and compression fatigue property was investigated for lotus-type porous copper possessing cylindrical pores aligned in one direction. The cyclic stress was applied in the direction parallel and perpendicular to the longitudinal axis of the pores. It was found that the fatigue strength at finite life of lotus-type porous copper is lower than that of nonporous copper, and the strength in the direction parallel to the longitudinal axis of the pores is higher than that in the perpendicular direction.

    DOI: 10.4028/www.scientific.net/MSF.510-511.966

  • Vibration-damping capacity of lotus-type porous magnesium at room temperature 査読

    Xie Zhen-kai, Banno Takumi, Yamada Yasuo, Tane Masakazu, Hyun Soong-keun, Okuda Yosiyuki, Nakajima Hideo

    ECO-MATERIALS PROCESSING & DESIGN VII   510-511   694 - 697   2006年( ISBN:0-87849-995-4

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    掲載種別:研究論文(学術雑誌)  

  • Fabrication and tensile properties of lotus-type porous iron and SUS304L stainless steel 査読

    Hyun Soong-Keun, Ikeda Teruyuki, Tane Masakazu, Nakajima Hideo

    ADVANCED STRUCTURAL AND FUNCTIONAL MATERIALS DESIGN, PROCEEDINGS   512   337 - 341   2006年( ISBN:0-87849-996-2

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    掲載種別:研究論文(学術雑誌)  

  • Fabrication and properties of porous materials with directional elongated pores 査読

    Nakajima H, Hyun SK, Tane M, Nakahata T

    ADVANCED STRUCTURAL AND FUNCTIONAL MATERIALS DESIGN, PROCEEDINGS   512   295 - 300   2006年( ISBN:0-87849-996-2

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    掲載種別:研究論文(学術雑誌)  

  • Extended effective-mean-field analysis for electrical conductivity of lotus-type porous nickel 査読

    Tane M, Hyun SK, Nakajima H

    ADVANCED STRUCTURAL AND FUNCTIONAL MATERIALS DESIGN, PROCEEDINGS   512   331 - 336   2006年( ISBN:0-87849-996-2

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    掲載種別:研究論文(学術雑誌)  

  • Anisotropic electrical conductivity of lotus-type porous nickel 査読

    Tane M, Hyun SK, Nakajima H

    JOURNAL OF APPLIED PHYSICS   97 ( 10 )   2005年05月( ISSN:0021-8979

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1063/1.1897069

  • Anisotropic yield behavior of lotus-type porous iron: Measurements and micromechanical mean-field analysis 査読

    M Tane, T Ichitsubo, SK Hyun, H Nakajima

    CAMBRIDGE UNIV PRESS JOURNAL OF MATERIALS RESEARCH   20 ( 1 )   135 - 143   2005年01月( ISSN:0884-2914

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    掲載種別:研究論文(学術雑誌)  

    Anisotropic yield behavior of lotus-type porous iron fabricated using the continuous-zone-melting method in a pressurized nitrogen and hydrogen atmosphere has been investigated. The 0.2% offset strength (compressive yield stress) in the loading direction parallel to the longitudinal axis of pores decreases linearly with increasing porosity, while the perpendicular strength decreases steeply. The strength versus porosity curves can be expressed using a well-known power law formula. In addition, the 0.2% offset strength of lotus iron prepared in a nitrogen and hydrogen atmosphere is found to be larger than that of lotus iron prepared in a hydrogen and helium atmosphere, which is attributed to the solid solution hardening by the solute nitrogen. Furthermore, we compare the experimental results to calculations obtained by means of the extended Qiu-Weng's mean-field method, and the comparison suggests that local stresses deviated from the average stress are dominant in the macroscopic yield behavior of lotus metals.

    DOI: 10.1557/JMR.2005.0009

  • Micromechanical mean-field analysis for stress-strain curve of lotus-type porous iron 査読

    M Tane, SK Hyun, T Ichitsubo, H Nakajima

    TRANS TECH PUBLICATIONS LTD ECO-MATERIALS PROCESSING & DESIGN VI   486-487   489 - 492   2005年( ISSN:0255-5476

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    掲載種別:研究論文(学術雑誌)  

    We studied the plastic behavior of lotus-type porous iron with unidirectional long cylindrical pores. Lotus-type porous iron with different porosities was fabricated by the continuous zone melting method in a pressurized hydrogen and helium atmosphere. To calculate the stress-strain curves for lotus iron, we applied a modified Qiu-Weng's micromechanical mean-field theory that has recently been proposed by the present authors [J. Mater. Res., in press], and compared the results with those of compression tests. We experimentally found that the deformation resistance and work hardening rate depend on the sample porosity and loading direction. They decrease with an increase in porosity, and their values in the loading along the direction perpendicular to the longitudinal axis of pores are smaller than those in the parallel-direction loading. Our micromechanical calculations reproduce well the stress-strain curves experimentally obtained and express the experimental trends successfully.

    DOI: 10.4028/www.scientific.net/MSF.486-487.489

  • Elastic constants of lotus-type porous magnesium: Comparison with effective-mean-field theory 査読

    Tane M, Ichitsubo T, Hirao M, Ikeda T, Nakajima H

    JOURNAL OF APPLIED PHYSICS   96 ( 7 )   3696 - 3701   2004年10月( ISSN:0021-8979

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1063/1.1776316

  • Elastic properties of lotus-type porous iron: acoustic measurement and extended effective-mean-field theory 査読

    M Tane, T Ichitsubo, H Nakajima, SK Hyun, M Hirao

    PERGAMON-ELSEVIER SCIENCE LTD ACTA MATERIALIA   52 ( 17 )   5195 - 5201   2004年10月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

    We studied the elastic properties of lotus-type porous iron experimentally and theoretically. First we determined the elastic constants of lotus iron fabricated by the continuous zone-melting method by using the acoustic resonance techniques. All the elastic moduli are found to follow the well-known power-law formula. Next, we extended the effective-mean-field (EMF) theory so as to consider effects of the pore orientation on the effective elastic constants. The model calculations proved that the extended EMF theory is capable of calculating satisfactorily the elastic properties of lotus metals. (C) 2004 Acta Materialia, Inc. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.actamat.2004.07.030

  • Effective-mean-field approach for macroscopic elastic constants of composites 査読

    Masakasu Tane, Tetsu Ichitsubo

    Applied Physics Letters   85 ( 2 )   197 - 199   2004年07月( ISSN:0003-6951

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    掲載種別:研究論文(学術雑誌)  

    The effective-mean-field method, an evaluation method for macroscopic elastic constants of composites, was discussed. It was found that the method was based on Mori-Tanaka's mean-field (MTMF) and the effective-medium approximation methods were replaced by the average fields of a virtually homogenized composite. It was observed that the effective elastic constants of the lotus-type porous copper were calculated. Analysis shows that for porous samples the method reproduced power-law behavior with regard to porosity.

    DOI: 10.1063/1.1769587

  • Temperature dependence of elastic constants of lotus-type porous copper 査読

    M Tane, T Ichitsubo, M Hirao, R Takeda, T Ikeda, H Nakajima

    ELSEVIER SCIENCE BV MATERIALS LETTERS   58 ( 11 )   1819 - 1824   2004年04月( ISSN:0167-577X

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    掲載種別:研究論文(学術雑誌)  

    We studied temperature dependence of anisotropic elastic constants of lotus-type porous copper that consists of unidirectionally aligned pores and the matrix of oriented crystallites. All the independent elastic constants were measured from room temperature to 400 degreesC using an electromagnetic acoustic resonance method. All the elastic constants decrease with increase of temperature. The porosity and oriented crystallites have the influence on the temperature dependence of the elastic constants. Micromechanics theory allows calculation of the temperature dependence of the elastic constants of lotus copper from those of monocrystal copper and shows agreement with the measurements. It is concluded that micromechanics model is then valid to predict the temperature dependence of the elastic constants of the lotus-type porous metals. (C) 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.matlet.2003.11.013

  • Anisotropic elastic constants of lotus-structured porous metals 査読

    M. Tane, T. Ichitsubo, H. Ogi, M. Hirao, T. Ikeda, H. Nakajima

    Cellular Metals: Manufacture, Properties and Applications (Eds: J. Banhart, N. Fleck, and A. Mortensen)   2003年12月

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    掲載種別:研究論文(学術雑誌)  

  • 超音波共鳴法によるロータス型ポーラスマグネシウムの弾性定数測定 査読

    多 根 正 和, 市 坪, 哲, 武 田, 亮, 平 尾 雅 彦, 池 田 輝 之, 中 嶋 英 雄

    日本金属学会 (JAPAN INST METALS, AOBA ARAMAKI, SENDAI, 980, JAPAN) 日本金属学会誌   67 ( 9 )   417 - 419   2003年09月( ISSN:0021-4876

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    掲載種別:研究論文(学術雑誌)  

    We measured the anisotropic elastic constants of a lotus-type porous magnesium, which possesses cylindrical pores aligned unidirectionally. We used the combination of resonant ultrasound spectroscopy and electromagnetic acoustic resonance methods to determine a complete set of the elastic constants. The acoustic measurements revealed that lotus magnesium shows hexagonal elastic symmetry with the c-axis along the longitudinal direction of the pores. Young's modulus E-parallel to parallel to the pore direction decreases linearly with porosity, while the normal Young's modulus E-perpendicular to drops rapidly.

    DOI: 10.2320/jinstmet1952.67.9_417

  • Elastic property of aged duplex stainless steel 査読

    M Tane, T Ichitsubo, H Ogi, M Hirao

    PERGAMON-ELSEVIER SCIENCE LTD SCRIPTA MATERIALIA   48 ( 3 )   229 - 234   2003年02月( ISSN:1359-6462

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    掲載種別:研究論文(学術雑誌)  

    We have measured the elastic constants of duplex stainless steel, JIS-SCS14A (MM), aged isothermally at 400 degreesC up to 10,000 h, using resonant ultrasound spectroscopy method. The elastic constant c(11) (= lambda + 2mu) increases monotonically with the aging time, but C-44 (= mu) remains virtually unchanged. Using a micromechanics model, we have deduced the elastic constants of alpha-phase on the assumption that those of gamma-phase are unchanged with the aging. The increase of the alpha-phase elastic constants reflects the spinodal decomposition of alpha-phase. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

    DOI: 10.1016/S1359-6462(02)00388-3

  • ロータス型ポーラス銅の異方的弾性定数 査読

    多根正和, 市坪哲, 荻博次, 平尾雅彦, 池田輝之, 中嶋英雄

    日本伸銅協会 銅と銅合金   42 ( 1 )   83 - 86   2003年01月

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    掲載種別:研究論文(学術雑誌)  

  • Anisotropic elastic constants of unidirectional porous copper measured with resonance ultrasound spectroscopy 査読

    T Ichitsubo, M Tane, H Ogi, M Hirao, T Ikeda, H Nakajima

    SPRINGER-VERLAG BERLIN NONDESTRUCTIVE CHARACTERIZATION OF MATERIALS XI   841 - 846   2003年

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    掲載種別:研究論文(学術雑誌)  

    We studied the elastic constants of unidirectional (lotus-structured) porous copper, regarding it as a composite material showing hexagonal elastic symmetry with the c-axis along the longitudinal direction of the pores. We used the combination of resonance ultrasound spectroscopy and electromagnetic acoustic resonance methods to determine five independent elastic constants c(ij) of the composite. The resulting Young's modulus E-// decreases linearly with porosity, while E-L drops rapidly and then slowly: they are given by E-// = 73.1x(1-p)(1.14) and E-perpendicular to == 96.6x(1-p)(2.26) GPa for porosity p, respectively.

  • 超音波共鳴法とマイクロメカニックスによるポーラス銅の異方性弾性定数 査読

    多 根 正 和, 市 坪, 哲, 平 尾 雅 彦, 森 下 智 博, 中 嶋 英 雄

    日本金属学会 (JAPAN INST METALS, AOBA ARAMAKI, SENDAI, 980, JAPAN) 日本金属学会誌   66 ( 11 )   1073 - 1077   2002年11月( ISSN:0021-4876

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    掲載種別:研究論文(学術雑誌)  

    We have studied the anisotropic elastic constants of crept copper with the oblate ellipsoidal pores and lotus-type porous copper with long straight pores aligned unidirectionally. We used the combination of resonant ultrasound spectroscopy and electromagnetic acoustic resonance methods to determine all the independent elastic constants with high accuracy. The elastic anisotropy depends on porosity, pore shape, pore orientation, and matrix's texture. We have calculated the elastic constants by a micromechanics theory, assuming that the pores are ellipsoidal inclusions of zero elasticity. We have obtained good agreement between micromechanics calculations and measurements.

    DOI: 10.2320/jinstmet1952.66.11_1073

  • Anisotropic elastic constants of lotus-type porous copper: measurements and micromechanics modeling 査読

    Ichitsubo T, Tane M, Ogi H, Hirao M, Ikeda T, Nakajima H

    ACTA MATERIALIA   50 ( 16 )   4105 - 4115   2002年09月( ISSN:1359-6454

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    掲載種別:研究論文(学術雑誌)  

▼全件表示

書籍等出版物

  • チタンの基礎と応用 査読

    池田勝彦(関西大学 名誉教授,株式会社日本スペリア社)/伊藤芳典(静岡県工業技術研究所) /伊藤喜昌(日本チタン協会)/上杉徳照(大阪公立大学)/上田正人(関西大学)/岡部 徹(東京大学)/小川 厚(JFEテクノリサーチ株式会社)/小池 磨(神鋼鋼線工業株式会社)/北河久和(日鉄テクノロジー株式会社)/小林千悟(愛媛大学)/小林俊郎(豊橋技術科学大学 名誉教授)/佐藤 裕(東北大学)/佐原亮二(物質・材料研究機構)/鈴木昭弘(大同特殊鋼株式会社)/竹田 修(東北大学)/武智 勉(日本製鉄株式会社)/多根正和(大阪公立大学)/仲井正昭(近畿大学)/中野貴由(大阪大学)/中山武典(元 株式会社神戸製鋼所)/成島尚之(東北大学)/新家光雄(東北大学 名誉教授)/萩原幸司(名古屋工業大学)/萩原益夫(物質・材料研究機構)/塙 隆夫(東京医科歯科大学)/古原 忠(東北大学)/細田秀樹(東京工業大学)/三浦秀士(九州大学 名誉教授)/三木 基(日本チタン協会)/御手洗容子(東京大学)/山出善章(日本製鉄株式会社)( 担当: 分担執筆)

    内田老鶴圃  2023年03月  ( ISBN:4753651126

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    総ページ数:464   担当ページ:95-112   著書種別:教科書・概説・概論  

  • バイオマテリアル研究の最前線

    多根 正和( 担当: 単著)

    日本金属学会  2014年12月 

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    著書種別:学術書  

  • マクロおよびナノポーラス金属の開発最前線

    多根 正和( 担当: 単著)

    シーエムシー出版  2011年07月 

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    著書種別:学術書  

  • Cellular and Porous Materials: Thermal Properties Simulation and Prediction, edited by Andreas Ochsner, Graeme E. Murch, Marcelo J. S. de Lemos

    T. Ogushi, H. Chiba, M. Tane, H. Nakajima( 担当: 単著)

    WILEY-VCH Verlag GmbH & Co. KGaA  2008年04月 

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    著書種別:学術書  

MISC(その他記事)

  • 金属3Dプリンティングの特異界面形成によるカスタム力学機能制御学の構築~階層化異方性骨組織に学びつつ~ 査読 国際共著

    中野 貴由, 石本 卓也, 松垣 あいら, 小笹 良輔, ゴクチェカヤ オズカン, 安田 弘行, 趙 研, 小泉 雄一郎, 奥川 将行, 吉矢 真人, 藤井 進, 多根 正和, 三好 英輔, 東野 昭太

    まてりあ   63 ( 1 )   36 - 41   2024年01月

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  • 凍結された合金組成ゆらぎに支配される無拡散等温オメガ変態および動的原子シャッフリング 査読

    材料   72 ( 9 )   638 - 641   2023年09月

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  • チタンおよびチタン合金の弾性特性 査読

    多根正和

    軽金属   2018年05月

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    掲載種別:記事・総説・解説・論説等(学術雑誌)   共著区分:単著  

  • bcc系チタン合金において生じる室温時効に伴う弾性率増加 査読

    多根正和, 梅田旭洋, 関野徹, 中野貴由, 岡本範彦, 市坪哲

    日本金属学会講演概要(CD-ROM)   162nd   2018年( ISSN:2433-3093

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    J-GLOBAL

  • 室温付近におけるTi-V合金の相変態挙動 査読

    笠谷周平, LUCKABAUER Martin, 岡本範彦, 多根正和, 市坪哲

    日本金属学会講演概要(CD-ROM)   162nd   2018年( ISSN:2433-3093

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    J-GLOBAL

  • Ti-V合金の低温における微細なω相の形成とそれを利用したα相析出強化の検討 査読

    笠谷周平, LUCKABAUER Martin, 岡本範彦, 多根正和, 市坪哲

    日本金属学会講演概要(CD-ROM)   163rd   2018年( ISSN:2433-3093

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    J-GLOBAL

  • 結晶配向性を有する多結晶体の弾性率から単結晶弾性率を決定する方法の構築 査読

    多根 正和

    まてりあ   2017年09月

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    掲載種別:記事・総説・解説・論説等(学術雑誌)   共著区分:単著  

    DOI: 10.2320/materia.56.541

  • 一方向性気孔を有するポーラス純鉄および炭素鋼の衝撃エネルギー吸収特性 査読

    多根 正和, 宋榮換, 中嶋英雄

    金属   2016年06月

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • OS0101 LPSO相の塑性変形にて形成する変形帯の特徴 査読

    萩原 幸司, 本浪 雅史, 山崎 倫昭, 岡本 拓也, 伊津野 仁史, 多根 正和, 中野 貴由, 河村 能人

    一般社団法人 日本機械学会 M&M材料力学カンファレンス   2014 ( 0 )   _OS0101 - 1_-_OS0101-2_   2014年

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    Formation of curious deformation bands has been reported as one of the deformation mechanisms occurring in a Mg-based long period stacking ordered (LPSO) phase. The origin of the deformation band is still unknown, and the possibility of the deformation kink band and/or the deformation twin has been discussed. To clarify this, the crystallographic nature of deformation bands formed in the LPSO phase was examined by scanning electron microscope-electron backscatter diffraction (SEM-EBSD) pattern analysis. The deformation band in the LPSO phase was found to show three arbitrariness on its crystallographic nature: an ambiguous crystal rotation axis that varied on the [0001] zone axis from band to band; an arbitral crystal rotation angle that was not fixed and showed relatively wide distributions; and a variation in crystal rotation angle depending on the position even within a deformation band boundary itself. These features were coincident with those observed in the deformation bands formed in Zn polycrystals, suggesting that the formed deformation bands in LPSO phase crystals are mainly deformation kink bands.

    DOI: 10.1299/jsmemm.2014._OS0101-1_

    CiNii Article

  • アモルファス酸化物の構造変化および結晶化に伴うナノポーラス化 査読

    仲村 龍介, 石丸 学, 平田 秋彦, 佐藤 和久, 多根 正和, 君塚 肇, 今野 豊彦, 中嶋 英雄

    まてりあ   2012年03月

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: 10.2320/materia.51.95

  • ロータス型ポーラス金属の変形挙動 査読

    多根正和, 中嶋英雄

    金属   Vol. 80 (2010), pp.837-843.   2010年10月

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • 発泡Al/AlN複合材の気孔形態と圧縮特性に及ぼすAlN粒子の影響 査読

    宋 榮換, 多根 正和, 井手 拓哉, 中嶋 英雄, 清宮 義博, HUR Bo-Young

    高温学会誌   36 ( 3 )   31 - 32   2010年05月( ISSN:0387-1096

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    CiNii Article

  • 一方向気孔を有するポーラス金属の物性評価 査読

    中嶋 英雄, 多根 正和, 中田 一博, 藤本 慎司, 市坪 哲, 田中 徹, 山田 康雄

    日本鉄鋼協会 ふぇらむ : 日本鉄鋼協会会報 = Bulletin of the Iron and Steel Institute of Japan   13 ( 6 )   368 - 374   2008年06月( ISSN:1341-688X

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    CiNii Article

  • ロータス型ポーラスアルミニウム基金属間化合物の作製とその気孔形態制御 査読

    井手 拓哉, 多根 正和, 中嶋 英雄

    高温学会誌   34 ( 3 )   14 - 15   2008年05月( ISSN:0387-1096

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    CiNii Article

  • 一方向気孔を有するポーラス金属の製法と物性 査読

    中嶋英雄, 多根正和, 玄丞均, 鈴木進補

    まてりあ   47 ( 4 )   196 - 202   2008年04月

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: 10.2320/materia.47.196

  • 第5回ポーラス金属および発泡金属に関する国際会議報告 : MetFoam2007 査読

    鈴木 進補, 多根 正和

    まてりあ : 日本金属学会会報   47 ( 1 )   52 - 52   2008年01月( ISSN:1340-2625

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    CiNii Article

  • Fabrication of Lotus-type Porous Magnesium using Hydrogen Decomposed from MgH(2) 査読

    M. Tane, H. Nakajima

    DESTECH PUBLICATIONS, INC POROUS METALS AND METALLIC FOAMS: METFOAM 2007   (2008) pp. 241-244   241 - 244   2008年

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    Lotus-type porous magnesium was fabricated through the use of hydrogen thermally decomposed from MgH(2) powders during unidirectional solidification in argon gas atmosphere. Liquid magnesium was cast into a mold in which MgH(2) powders were placed, and it was unidirectionally solidified, which achieved the growth of pores elongated along the solidification direction. The fabrication method is simpler than the conventional method where lotus metals are produced in pressurized hydrogen atmosphere. The porosity of lotus magnesium fabricated with MgH(2) powders increases with increasing amount of MgH(2) powders. The porosity and pore size change with advancing solidification (pore growth), and the rate of the change depends on the amount of the MgH(2) powders.

  • 一方向気孔を有するポーラス金属の物性評価 査読

    中嶋英雄, 多根正和, 中田一博, 藤本慎司, 市坪哲, 田中徹, 山田康雄

    ふぇらむ   94 ( 6 )   A368 - A374   2008年( ISSN:0021-1575

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • ロータス型ポーラス炭素鋼の3Dイメージベースモデリングと解析 査読

    久次米利彦, 多根正和, 中嶋英雄

    まてりあ(特集「顕微鏡法による材料開発のための微細構造研究最前線(7)」)   Vol. 46, (2007) p. 836.   2007年12月

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: 10.2320/materia.46.836

  • ロータス型ポーラス金属の巨視的弾性率:新たな平均場近似法による定量予測 査読

    多根正和, 市坪哲, 中嶋英雄, 平尾雅彦

    まてりあ   2007年02月

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: 10.2320/materia.46.70

  • ロータス型ポーラス炭素鋼の3次元モデリングと有限要素法による解析 査読

    久次米 利彦, 多根 正和, 玄 丞均, 中嶋 英雄

    高温学会誌   32 ( 6 )   9 - 9   2006年12月( ISSN:0387-1096

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    CiNii Article

  • 一方向ポーラス金属の作製と特性 査読

    中嶋英雄, 多根正和, 玄丞均

    材料の科学と工学(日本材料科学会)   2006年01月

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • 連続鋳造法によるロータス型ポーラス銅の作製 査読

    朴 宰成, 玄 丞均, 多根 正和, 中嶋 英雄

    高温学会誌   31 ( 6 )   13 - 13   2005年11月( ISSN:0387-1096

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    CiNii Article

  • ロータス型ポーラス銅の引張-圧縮疲労特性 査読

    関 宏範, 多根 正和, 玄 丞均, 中嶋 英雄, 山崎 信哉, 大塚 正久

    高温学会誌   31 ( 3 )   11 - 11   2005年05月( ISSN:0387-1096

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    CiNii Article

  • ロータス型ポーラスNi_3Al金属間化合物の作製に及ぼすAl含有率の影響 査読

    井手 拓哉, 玄 丞均, 多根 正和, 中嶋 英雄

    高温学会誌   31 ( 1 )   19 - 19   2005年01月( ISSN:0387-1096

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    CiNii Article

  • 熱脆化に伴う二相ステンレス鋼の弾性定数変化 査読

    多根 正和, 市坪 哲, 荻 博次, 平尾 雅彦

    日本工業出版 超音波テクノ   2001年11月

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

▼全件表示

講演・口頭発表等

  • ⼒学特性の向上に向けた炭素繊維内部の結晶⼦の応⼒下歪み状態の解析 国内会議

    ⽯川 透, ⽥中 ⽂彦, 多根 正和

    第50回炭素材料学会年会  2023年11月  炭素材料学会

     詳細を見る

    会議種別:口頭発表(一般)  

  • Elastic properties of additively manufactured biomedical Ti alloys 招待 国際会議

    Masakazu Tane, Shota Higashino, Daisuke Miyashita, Eisuke Miyoshi, Takuya Ishimoto, Takayoshi Nakano

    The 11th Pacific Rim International Conference on Advanced Materials and Processing (PRICM11)  2023年11月  KIM (The Korean Institute of Metals and Materials)

     詳細を見る

    会議種別:口頭発表(基調)  

  • Anisotropic elastic properties of biomedical Ti alloys prepared by additive manufacturing 国際会議

    Masakazu Tane, Shota Higashino, Daisuke Miyashita, Eisuke Miyoshi, Takuya Ishimoto, Takayoshi Nakano

    The 1st international conference on Creation of Materials by Superthermal Field 2023 (CMSTF2023)  2023年11月  Creation of Materials by Super Thermal Field: Neo-3D printing by Manipulating Atomic Arrangement through Giant Potential Gradient

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Life Science Center in Senri-Chuo, Osaka, Japan  

  • 積層造形法によって作製された Ti-15Mo-5Zr-3Al合金の弾性特性 国内会議

    宮下 大輔, 東野 昭太, 三好 英輔, 石本 卓也, 中野 貴由, 多根 正和

    日本機械学会 M&M2023 材料力学カンファレンス  2023年09月  日本機械学会

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    会議種別:口頭発表(一般)  

  • β型Ti-V基合金へのAlおよびO添加がヤング率および内部摩擦の温度依存性に与える影響 国内会議

    三鼓 尋斗, 東野 昭太, 三好 英輔, 多根 正和

    日本機械学会 M&M2023 材料力学カンファレンス  2023年09月  日本機械学会

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    会議種別:口頭発表(一般)  

  • β型Ti-V基合金へのAlおよびO添加がヤング率および内部摩擦の温度依存性に与える影響 国内会議

    三鼓 尋斗, 東野 昭太, 三好 英輔, 多根 正和

    日本機械学会 M&M2023 材料力学カンファレンス  2023年09月  日本機械学会

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    会議種別:口頭発表(一般)  

  • Crystal Plasticity Modelling of AM Structure to Study Influence of Interfaces on Deformation Behavior 国際会議

    Tsuyoshi Mayama, Koki Manabe, Masakazu Tane, Takuya Ishimoto, Takayoshi Nakano

    JSME-KSME Joint Symposium on Computational Mechanics & CAE 2023  2023年08月  CAE and Applied Mechanics Division, The Korean Society of Mechanical Engineers

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    会議種別:口頭発表(一般)  

    開催地:Seoul National University, Korea  

  • Diffusionless isothermal ω transformation in metastable Ti alloys with body-centered cubic structure 招待 国際会議

    Masakazu Tane, Shota Higashino

    International Conference on Processing & Manufacturing of advanced Materials (THERMEC’2023)  2023年07月 

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    会議種別:口頭発表(招待・特別)  

  • 結晶塑性解析に基づくミルフィーユ構造体における キンク形成機構の理解 国際会議

    眞山 剛, 萩原 幸司, 君塚 肇, 多根 正和, 江草 大佑, 阿部 英司

    軽金属学会 第144回春期大会  2023年05月  軽金属学会

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    会議種別:口頭発表(一般)  

  • 微細組織・構造を反映したMg系材料の弾性特性 国内会議

    多根 正和

    高性能Mg合金 創成 加工研究会 第 86回講演会 「 マルチスケール・マグネシウム・モデリング 」  2023年01月  高性能Mg合金創成加工研究会

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    会議種別:口頭発表(招待・特別)  

    開催地:熊本大学 先進マグネシウム国際研究センター  

  • 微視的弾性理論に基づく計測・解析手法の構築を基軸とした生体用Ti合金の 弾性特性および相変態挙動の解明 招待 国内会議

    多根 正和

    日本鉄鋼協会チタンフォーラム「ポストコロナ社会を支える高機能チタン材料」R4 年度講演会 測定技術の進歩によるTi 研究の進展  2022年12月  日本鉄鋼協会チタンフォーラム

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    会議種別:口頭発表(招待・特別)  

    開催地:東京 関大八重洲オフィス  

  • ゆらぎ誘起原子シャッフリングの格子動力学と変形挙動との相関 国内会議

    多根 正和

    CREST/さきがけ 「ナノ力学」領域 第1回公開シンポジウム -2019年度採択課題成果発表-  2022年10月  国立研究開発法人 科学技術振興機構

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    開催地:AP西新宿, 東京  

  • 結晶配向制御された積層構造体の弾性特性制御のための数値解析手法構築 国内会議

    眞山 剛, 多根 正和, 東野 昭太, 石本 卓也, 中野 貴由

    日本機械学会 M&M 2022 材料力学カンファレンス  2022年09月  日本機械学会

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    会議種別:口頭発表(一般)  

    開催地:弘前大学 文京町キャンパス, 青森県弘前市  

  • 組織型ミルフィーユ材料の弾性特性 国内会議

    多根 正和,東野 昭太,眞山 剛,萩原 幸司

    日本金属学会 日本金属学会2022年秋期(第171回)講演大会  2022年09月  日本金属学会

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    会議種別:口頭発表(一般)  

    開催地:福岡工業大学, 福岡県福岡市  

  • Kinetics of diffusionless isothermal and athermal omega transformations in Ti alloys 招待 国際共著 国際会議

    M. Tane, N.L. Okamoto, K. Inoue, M. Luckabauer, Y. Nagai, T. Sekino, T. Nakano, T. Ichitsubo

    19th International Conference on Internal Friction and Mechanical Spectroscopy  2022年06月 

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    会議種別:口頭発表(招待・特別)  

    開催地:Rome, Italia  

  • Diffusionless isothermal ω transformation in Ti alloys with low β-phase stability and low elastic modulus 招待 国際会議

    Masakazu Tane

    Materials Research Meeting 2021  2021年12月 

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    会議種別:口頭発表(招待・特別)  

    開催地:PACIFICO YOKOHAMA  

  • 合金組成ゆらぎによって駆動されるTi合金のオメガ変態とそれに関連した原子シャッフリング 招待 国内会議

    多根 正和

    第70期 塑性工学/マルチスケール材料力学 合同部門委員会  2021年10月 

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    会議種別:口頭発表(招待・特別)  

    開催地:京都テルサ(オンライン)  

  • チタン合金のオメガ変態およびそれに起因した原子シャッフリングの動的挙動 招待 国内会議

    多根 正和

    第31回格子欠陥フォーラム  2021年09月 

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    会議種別:口頭発表(招待・特別)  

    開催地:オンライン開催  

  • bcc 構造を有するTi 合金の弾性特性とオメガ変態との関係 国内会議

    多根 正和

    ⽇本機械学会 M&M2021 材料⼒学カンファレンス  2021年09月 

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    会議種別:口頭発表(一般)  

    開催地:名古屋⼤学 東⼭キャンパス(オンライン)  

  • 生体用チタン合金に必要とされる低弾性率化と相転移現象の解明 招待 国内会議

    多根 正和

    2021年度第2回 機能創成科学セミナー  2021年07月 

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    会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:大阪市立大学(オンライン)  

▼全件表示

科研費

  • 構造・組織型ミルフィーユ材料における弾性不均質性とそれに起因した応力・ひずみ分配

    新学術領域研究(研究領域提案型)  2021年04月

  • 「統計力学的な合金組成ゆらぎの制御」による生体用合金の新規低弾性率化手法の構築

    基盤研究(B)  2021年04月

  • Ti合金における変形誘起相変態に起因した弾性率軟化現象の解明と生体材料への応用

    挑戦的研究(萌芽)  2019年06月

  • ミルフィーユ構造における硬質・軟質層の原子結合状態を反映した弾性不均質性の解明

    新学術領域研究(研究領域提案型)  2019年04月

  • bcc系Ti合金において発現する“室温時効に伴う”特異な相変態および力学特性変化

    基盤研究(B)  2017年04月

  • “単結晶育成が極めて困難な”Mg合金およびMg基化合物相の単結晶弾性特性の解明

    挑戦的研究(開拓・萌芽)  2015年04月

  • “単結晶育成を必要としない単結晶弾性率の決定方法”の構築と生体用金属材料への応用

    若手研究(A)  2014年04月

  • 濃化層におけるクラスター構造を反映したLPSO相の弾性率および熱膨張の解明

    新学術領域研究(研究領域提案型)  2014年04月

  • 力学系および組織形成シミュレーションに不可欠なLPSO相単相の単結晶弾性率の解明

    新学術領域研究(研究領域提案型)  2012年04月

  • マイクロマシーニングによる強力骨組織アンカー型ポーラス インプラントの開発

    基盤研究(A)  2010年

  • 微細組織に依存するβ型チタン合金の弾性特性の解明とその低ヤング率化

    若手研究(B)  2009年

  • ガス化合物添加による貫通孔型ポーラス金属の製法開発と電子・医療機器材料への応用

    挑戦的研究(開拓・萌芽)  2009年

  • マテリアル・ボーンバイオロジーの構築

    萌芽研究  2007年

  • 革新的金属ナノ中空球および金属ナノチューブの創製と機能性解明

    基盤研究(S)  2005年

  • 無垢の鉄よりも4倍の比強度をもつ軽量高強度鉄の創製

    萌芽研究  2003年

▼全件表示

受託研究

  • ゆらぎ誘起原子シャッフリングの格子動力学と変形挙動との相関

    国立研究開発法人科学技術振興機構  2019年10月

担当教育概要

  • 材料強度学、材料デザイン学、材料物性学特論、特別演習(弾性論)、設計製作実習 (B)、エンジニアリングデザイン

学外での担当授業科目

  • マテリアル社会連携学Ⅱ

    2022年12月
    機関名:大阪大学

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    科目区分:大学院専門科目  国名:日本国

メディア報道

  • チタン合金の弾力性制御 結晶に酸素加え変化抑える 新聞・雑誌

    日刊工業新聞  24面  2023年07月

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    SDGs:

その他

  • 職務経歴

    2021年04月 - 継続中

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    大阪市立大学 大学院工学研究科 教授