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Effect of segregated Al on {1012} and {1011} twinning in Mg

机译：铝对镁中{1012}和{1011}孪晶的影响

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摘要

Molecular dynamics simulations of compression deformation of [1120]-textured 2-dimensional polycrystalline pure Mg, Mg-0.1 at.%Al, and Mg-1.0 at.%Al models were performed at 5 and 300 K. A {1011} twin nucleated before formation of a {1012} twin in the simulations at 5 K, while a {1011} twin nucleated after formation of a {1012} twin in the simulations at 300 K. The formation of a {1011} twin was the result of the glide of pyramidal (c + a) partial dislocations of 1 /6{ 1011} [2023]. {1011} twin formation was suppressed at the sites around the Al atoms because the strong Mg-Al bond suppresses atomic shuffling. However, formation was not suppressed at the sites away from the Al atoms because the effect of strong Mg-Al bond is short range. On the other hand, because {1012} twinning requires the simultaneous glide of zonal dislocations, Al inevitably suppressed {1012} twinning.
机译：在5和300 K下进行[1120]织构化的二维多晶纯Mg，Mg-0.1 at。％Al和Mg-1.0 at。％Al模型的压缩变形的分子动力学模拟。{1011}双核在5 K的模拟中形成{1012}孪晶之前，而在300 K的模拟中形成{1012}孪晶之后，{1011}孪晶成核。{1011}孪晶的形成是由于1/6 {1011} [2023]的锥体（c + a）部分位错的滑行。 {1011}在Al原子周围的位置抑制了孪晶的形成，因为强的Mg-Al键抑制了原子改组。但是，由于强Mg-Al键的作用是短距离的，因此在远离Al原子的位置没有抑制形成。另一方面，由于{1012}孪晶需要同时发生带状位错的滑动，因此Al不可避免地抑制了{1012}孪晶。

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  • 来源
    《Journal of Materials Research》 |2015年第23期|3629-3641|共13页
  • 作者

    Naoki Miyazawa; Takashi Yoshida; Motohiro Yuasa; Yasumasa Chino; Mamoru Mabuchi;

  • 作者单位

    Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University, Kyoto 606-8501, Japan;

    Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University, Kyoto 606-8501, Japan;

    Structural Materials Research Institute, National Institute of Advanced Industrial Science and Technology, Nagoya 463-8560, Japan;

    Structural Materials Research Institute, National Institute of Advanced Industrial Science and Technology, Nagoya 463-8560, Japan;

    Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University, Kyoto 606-8501, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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