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首页> 外文期刊>Materials Science and Engineering >Microstructure and texture evolution during compression-extrusion process for tension/compression symmetrical ZK61 magnesium alloy rod
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Microstructure and texture evolution during compression-extrusion process for tension/compression symmetrical ZK61 magnesium alloy rod

机译：张力/压缩对称ZK61镁合金棒压缩挤出过程中的微观结构和纹理演化

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摘要

Tension/compression symmetrical ZK61 magnesium alloy rod with fine grain and weak texture was achieved by compression-extrusion process. The formation mechanism of fine grain and weak texture was analyzed by investigating the microstructure and texture evolution during compression-extrusion process. In compression stage, {10-12} twinning deformation was activated greatly, which brought about significant grain refinement and formation of <0002>] ‖ED texture. As extrusion process going on, twinning gradually decreased and basal slip dominated the following deformation. Texture oriented into single annular shape by subsequent twinning in early extrusion and the annulation rotated toward ED gradually then merged into fiber texture by basal slip in late extrusion. Besides, texture was weakened by grain boundary slip and non-basal slip. With DRXed grain orientations similar to that of the deformed parent grains, Discontinuous dynamic recrystallization played a dominant role in grain refinement during extrusion stage, but the refinement was relatively minor compared to twining refinement in compression stage. Finally, magnesium alloy with fine grain and weak texture was achieved. The benefit of this microstructure and texture characteristic upon mechanical properties was the great enhancement of compressive yield strength, from the suppression of twinning when compressed. Therefore, tension/compression asymmetry was greatly improved by compression-extrusion process.
机译：通过压缩挤出过程实现了具有细粒和弱质纹的张力/压缩对称ZK61镁合金棒。通过研究压缩挤出过程中的微观结构和纹理演化来分析细粒和弱质纹理的形成机制。在压缩阶段，{10-12}孪晶变形大大激活，这引起了显着的晶粒细化和形成的纹理。随着挤出过程进行，孪生逐渐减少，基底滑动占主导地位。通过在早期挤出的后续挤压后孪生造成单个环形的纹理逐渐旋转，然后通过基部滑动在晚期挤出中逐渐朝向ED旋转。此外，纹理通过晶界滑动和非基础滑动削弱。对于类似于变形的母粒的Drxed晶粒取向，不连续的动态重结晶在挤出阶段期间在晶粒细化中发挥了显着作用，但与压缩阶段的缠绕细化相比，细化相对较小。最后，实现了具有细粒和弱纹理的镁合金。这种微观结构和纹理特性在机械性能下的益处是压缩屈服强度的大大提高，从压缩时抑制孪晶。因此，通过压缩挤出过程大大提高了张力/压缩不对称性。

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  • 来源
    《Materials Science and Engineering》 |2021年第4期|140807.1-140807.11|共11页
  • 作者

    Haixuan Wang; Wenzhen Chen; Wencong Zhang; Daqing Fang; Songhui Wang; Wenke Wang;

  • 作者单位

    School of Materials Science and Engineering Harbin Institute of Technology Weihai 264209 PR China Weihai Lightweight Materials and Forming Engineering Research Center Weihai 264209 PR China;

    School of Materials Science and Engineering Harbin Institute of Technology Weihai 264209 PR China Weihai Lightweight Materials and Forming Engineering Research Center Weihai 264209 PR China;

    School of Materials Science and Engineering Harbin Institute of Technology Weihai 264209 PR China Weihai Lightweight Materials and Forming Engineering Research Center Weihai 264209 PR China;

    State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Beilin Campus Xi'an 710049 China Harbin Institute of Technology-Weihai Innovation Park Weihai 264209 PR China;

    School of Materials Science and Engineering Harbin Institute of Technology Weihai 264209 PR China Weihai Lightweight Materials and Forming Engineering Research Center Weihai 264209 PR China;

    School of Materials Science and Engineering Harbin Institute of Technology Weihai 264209 PR China Weihai Lightweight Materials and Forming Engineering Research Center Weihai 264209 PR China;

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  • 正文语种 eng
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  • 关键词

    Magnesium alloy; Tension/compression asymmetry; Compression-extrusion; Microstructure; Texture;

    机译：镁合金;张力/压缩不对称;压缩挤出;微观结构;纹理;

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