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Dynamic precipitation in a Mg-Gd-Y-Zr alloy during hot compression

机译：Mg-Gd-Y-Zr合金热压缩过程中的动态沉淀

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摘要

Dynamic precipitation of a Mg-8.3Gd-2.6Y-0.4Zr (wt.%) alloy during hot compression was systematically investigated in the present work. For this purpose, the compression tests were conducted at temperatures ranging from 300 ℃ to 500 ℃ and strain rates varying from 0.001 s~(-1) to 1 s~(-1). Results revealed that the dynamic precipitation of equilibrium β phase, i.e., Mg_5(Gd,Y) phase, was sensitive to the deformation temperature rather than the strain rate. The precipitation took place during compression in the temperature range of 300-400 ℃, whereas it did not occur when temperature exceeded 450 ℃. The dynamically precipitated β phase showed an irregular shape and did not possess any specific crystal-lographic orientation relationship with the matrix. The precipitates distributing at the dynamically re-crystallized (DRXed) grain boundaries could severely suppress the growth of DRXed grains due to pinning effect, which therefore formed ultra-fine DRXed grains with sizes of ～ 200-400 nm.
机译：在本工作中，系统地研究了Mg-8.3Gd-2.6Y-0.4Zr（wt。％）合金在热压缩过程中的动态沉淀。为此，在300℃至500℃的温度范围内进行了压缩试验，应变率在0.001 s〜（-1）到1 s〜（-1）之间变化。结果表明，平衡β相即Mg_5（Gd，Y）相的动态沉淀对变形温度而不是应变速率敏感。在300-400℃的温度范围内压缩期间发生沉淀，而当温度超过450℃时不会发生沉淀。动态沉淀的β相显示出不规则形状，并且与基质不具有任何特定的晶体-色谱取向关系。由于钉扎效应，分布在动态再结晶（DRXed）晶界的析出物可以严重抑制DRXd晶粒的生长，因此形成尺寸约为200-400 nm的超细DRXd晶粒。

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  • 来源
    《Materials Science and Engineering》 |2015年第1期|241-247|共7页
  • 作者

    Hongchao Xiao; Bei Tang; Chuming Liu; Yonghao Gao; Shilun Yu; Shunong Jiang;

  • 作者单位

    School of Material Science and Engineering, Central South University, Changsha 410083, China;

    School of Material Science and Engineering, Central South University, Changsha 410083, China;

    School of Material Science and Engineering, Central South University, Changsha 410083, China;

    School of Material Science and Engineering, Central South University, Changsha 410083, China;

    School of Material Science and Engineering, Central South University, Changsha 410083, China;

    School of Civil Engineering, Central South University, Changsha 410083, China;

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  • 正文语种 eng
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  • 关键词

    Mg-8.3Gd-2.6Y-0.4Zr; Hot compression; Dynamic precipitation; β phase;

    机译：Mg-8.3Gd-2.6Y-0.4Zr;热压缩;动态降水;β相;

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