Materials science and engineering of hydrogen-induced shear transformation in hydrogen absorbing materials

吸氢材料氢致剪切转变的材料科学与工程

• 批准号: 25630304
• 负责人: INUI Haruyuki
• 金额: $ 2.58万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2013
• 资助国家: 日本
• 起止时间: 2013-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-25630304/
• 关键词: 協調的原子集団励起; プラストン; 変形双晶; 核生成; 臨界体積; マイクロピラー; 試験片サイズ依存性; c/a軸比; .協調的原子集団励起; 試験片サイズ依存症

The activation of deformation twinning is indispensable to promote the workability of Mg and its alloys, but their activation has not been well understood. The activation of deformation twinning is known to be difficult when the grain size is reduced down to the orders of nano-meters. On the assumption of the existence of critical volume for twin nucleation, we have investigated nucleus sizes for deformation twinning through the determination of the critical volume for the transition in deformation modes from twinning to slip. When single crystals of Mg of the size of micron-meter order are compressed along the a-axis direction, twinning on {11-21} is observed. If the specimen size is further reduced down to sub-micron orders, slip on {11-23} id observed to operate instead of twinning on {11-21}. The similar behavior is observed in LPSO single crystals of the Mg-Zn-Y system. The critical volume for twinning in these alloys is thus determined to be about 1 micrometer.

形变孪晶的激活对提高镁合金的加工性能是必不可少的，但其激活机制尚未得到充分的认识。已知当晶粒尺寸减小到纳米量级时，变形孪晶的激活是困难的。在孪晶形核临界体积存在的假设下，通过确定形变模式从孪晶向滑移转变的临界体积，研究了形变孪晶的形核尺寸。当微米级尺寸的Mg单晶沿沿着a轴方向压缩时，观察到{11-21}上的孪晶。如果试样尺寸进一步减小到亚微米量级，则观察到{11-23}上的滑移而不是{11-21}上的孪生。在Mg-Zn-Y系统的LPSO单晶中观察到类似的行为。因此，在这些合金中孪晶的临界体积被确定为约1微米。

项目成果

MoSi2単結晶マイクロピラーの圧縮変形

MoSi2单晶微柱的压缩变形

• 发表时间: 2013
• 作者: Norihiko L. Okamoto;Daisuke Kashioka;Masahiro Inomoto;Haruyuki Inui;乾晴行;乾晴行,岡本範彦,井元雅弘;井上敦司,岸田恭輔,乾晴行,萩原幸司;井元雅弘,岡本範彦,乾晴行;中塚怜志,岸田恭輔,乾晴行
• 通讯作者: 中塚怜志,岸田恭輔,乾晴行

Fe-Zn系金属間化合物ζ相の結晶構造と塑性変形

Fe-Zn金属间化合物ζ相的晶体结构与塑性变形

• 发表时间: 2013
• 作者: 乾晴行，岡本範彦;井元雅弘;乾 晴行
• 通讯作者: 乾 晴行

Micropillar Compression Deformation of Fe-Zn Intermetallic Compounds in the Coating Layer of Galvanized Steel

镀锌钢镀层Fe-Zn金属间化合物的微柱压缩变形

• DOI: 10.1557/opl.2012.1752
• 发表时间: 2013
• 期刊: Materials Research Society Symposium Proceedings
• 作者: N.L. Okamoto;D. Kashioka and H. Inui
• 通讯作者: D. Kashioka and H. Inui

Compression deformability of Γ and ζ Fe-Zn intermetallics to mitigate detachment of brittle intermetallic coating of galvannealed steels

• DOI: 10.1016/j.scriptamat.2013.05.003
• 发表时间: 2013-08-01
• 期刊: SCRIPTA MATERIALIA
• 影响因子: 6
• 作者: Okamoto, Norihiko L.;Kashioka, Daisuke;Yamaguchi, Shu
• 通讯作者: Yamaguchi, Shu

Crystal Structure and Deformation of Long Period Stacking Ordered Intermetallic Phases in the Mg-Al-Gd Systems

Mg-Al-Gd 系长周期堆积有序金属间相的晶体结构和变形

• 发表时间: 2013
• 作者: Norihiko L. Okamoto;Daisuke Kashioka;Masahiro Inomoto;Haruyuki Inui;乾晴行;乾晴行,岡本範彦,井元雅弘;井上敦司,岸田恭輔,乾晴行,萩原幸司;井元雅弘,岡本範彦,乾晴行;中塚怜志,岸田恭輔,乾晴行;H. Inui
• 通讯作者: H. Inui