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Influence of pre-twinning on high strain rate compressive behavior of AZ31 Mg-alloys

机译：预缠绕对AZ31镁合金高应变率压缩行为的影响

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摘要

This study aims to investigate the effect of pre-twinning on high strain rate deformation behavior of AZ31 Mg-alloy sheet. The high strain rate compressive behavior of AZ31 magnesium alloy sheet was measured in rolling direction (RD), transverse direction (TD) and normal direction (ND) by using a Split Hopkinson Pressure Bar (SHPB). The microstructural evolution and texture during pre-compression along RD and TD have been analyzed by electron back-scatter diffraction (EBSD). The results demonstrate that pre-compression along RD and TD can promote the activation of multiple twin variants in AZ31 alloys, which can significantly improve the yield strength due to grain refinement induced by {10 (1) over bar2} twinning lamellas. However, the high strain rate yield strength along ND drastically decreased after pre-twinning, which is mainly attributed to the occurrence of de-twinning. The formation of {10 (1) over bar2}-{10 (1) over bar2} double twins and a large number of cross-twinning lamellas, after pre-twinning of TD + RD, can effectively inhibit de-twinning behavior and increase the yield strength, when high strain rate compression is applied along ND.
机译：本研究旨在探讨预缠绕对AZ31镁合金薄板高应变率变形行为的影响。使用Split Hopkinson压杆（SHPB）在滚动方向（RD），横向（TD）和法线方向（ND）上测量了AZ31镁合金薄板的高应变率压缩行为。通过电子反向散射衍射（EBSD）分析了沿RD和TD预压缩过程中的微观结构演变和织构。结果表明，沿RD和TD的预压缩可促进AZ31合金中多个孪晶变体的活化，由于{10（1）超过bar2}孪晶薄层引起的晶粒细化，可显着提高屈服强度。然而，预缠绕后沿ND的高应变率屈服强度急剧下降，这主要归因于发生了双缠绕。在TD + RD预缠绕后，在bar2}上{10（1）}-在bar2}上{10（1）形成双孪晶和大量交叉缠绕的薄片，可以有效抑制缠绕现象并增加沿ND施加高应变率压缩时的屈服强度。

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  • 来源
    《Materials Science and Engineering》 |2019年第10期|309-317|共9页
  • 作者

    Wang Ruifeng; Mao Pingli; Liu Yanyu; Chen Yang; Wang Zhi; Wang Feng; Zhou Le; Liu Zheng;

  • 作者单位

    Shenyang Univ Technol, Sch Mat Sci & Technol, Shenyang 110870, Liaoning, Peoples R China;

    Shenyang Univ Technol, Sch Mat Sci & Technol, Shenyang 110870, Liaoning, Peoples R China;

    Shenyang Univ Technol, Sch Mat Sci & Technol, Shenyang 110870, Liaoning, Peoples R China;

    Shenyang Univ Technol, Sch Mat Sci & Technol, Shenyang 110870, Liaoning, Peoples R China;

    Shenyang Univ Technol, Sch Mat Sci & Technol, Shenyang 110870, Liaoning, Peoples R China;

    Shenyang Univ Technol, Sch Mat Sci & Technol, Shenyang 110870, Liaoning, Peoples R China;

    Shenyang Univ Technol, Sch Mat Sci & Technol, Shenyang 110870, Liaoning, Peoples R China;

    Shenyang Univ Technol, Sch Mat Sci & Technol, Shenyang 110870, Liaoning, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    AZ31 Magnesium alloys; Twinning; Mechanical behavior; High strain rates deformation; EBSD; SHBP;

    机译：AZ31镁合金;孪晶;力学性能;高应变率变形;EBSD;SHBP;

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