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Nucleation mechanism of {1012} twin with low Schmid factor in hexagonal close-packed metals

机译：{1012}双胞胎的成核机制，六边形紧密金属低施密系数

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摘要

{1012} twin is one of the most common twins in the plastic deformation of hexagonal close-packed metals. It has been found that some {1012} twinning behaviors do not comply with the Schmid law, but the mechanism is not well understood. In the present study, high resolution transmission electron microscopy and electron back-scattered diffraction technique were used to comprehensively study the nucleation and growth of {1012} twins with low Schmid factor at small angle grain boundaries in pure Titanium. The experimental results revealed that the basal dislocations slipped to the small angle grain boundaries and reacted with the preexisted misfit dislocations, resulting in twinning dislocations. It was identified to be a crucial process for twin nucleation with low Schmid factor. A novel dislocation reaction mechanism for the low SF twin nucleation was proposed.
机译：{1012}双胞胎是六边形紧密金属塑性变形中最常见的双胞胎之一。有人发现，一些{1012}孪生行为不符合施密法，但该机制并不熟知。在本研究中，使用高分辨率透射电子显微镜和电子背散射衍射技术来综合研究【1012】双胞胎的含量和生长，在纯钛中小角晶界。实验结果表明，基础脱位脱落到小角度晶界并与预先存在的错配脱位反应，导致孪生脱位。鉴定为具有低乳化因子的双胞胎成核的关键方法。提出了一种用于低SF双核成核的新型脱位反应机理。

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  • 来源
    《Materials Science and Engineering》 |2020年第jul22期|139542.1-139542.8|共8页
  • 作者

    Jingwei Li; Xiaocui Li; Mingchao Yu; Manling Sui;

  • 作者单位

    Beijing Key Laboratory of Microstructure and Properties of Solids Institute of Microstructure and Properties of Advanced Materials Beijing University of Technology Beijing 100124 China;

    Beijing Key Laboratory of Microstructure and Properties of Solids Institute of Microstructure and Properties of Advanced Materials Beijing University of Technology Beijing 100124 China Department of Mechanical Engineering City University of Hong Kong Hong Kong 999077 China;

    Beijing Key Laboratory of Microstructure and Properties of Solids Institute of Microstructure and Properties of Advanced Materials Beijing University of Technology Beijing 100124 China;

    Beijing Key Laboratory of Microstructure and Properties of Solids Institute of Microstructure and Properties of Advanced Materials Beijing University of Technology Beijing 100124 China;

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  • 正文语种 eng
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  • 关键词

    {1012} twin nucleation; Low Schmid factor; Dislocation reaction; Twinning dislocation;

    机译：{1012}双胞胎成核;低施密因素;错位反应;孪生脱位;

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