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Effect of grain boundary on the precipitation behavior and hardness of Al-Cu-Mg alloy bicrystals during stress-aging

机译:应力时效过程中晶界对Al-Cu-Mg合金双晶析出行为和硬度的影响

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摘要

While it is clear that precipitates near grain boundaries in aluminum alloys nucleate more easily and grow more quickly, the mechanism of how the grain boundaries influence the anisotropic distribution of S precipitates is still unknown. In this study, a bicrystal Al-Cu-Mg alloy specimen was prepared to obtain a single grain boundary. The precipitation distribution and hardness of the Al-Cu-Mg alloy bicrystal were analyzed after stress aging at 30 MPa. Transmission electron microscopy was used to analyze the precipitation behavior of S precipitates, and the hardness was tested along the location on the bicrystal specimen. The hardness of the right area around the grain boundary is lower than that of the left area around the grain boundary after stress aging. The precipitation behavior around the grain boundary is different from that in the matrix. For the left area near the grain boundary with the (1, -1, 8)_(Al) plane orientation, the anisotropic distribution of the S precipitates is inhibited. For the right area near the grain boundary with the (3, 5, 6)_(Al) plane orientation, the anisotropic distribution of the S precipitates is even more pronounced than that in the right matrix. This difference in the influence depends on the crystallographic orientations of the matrix around the two sides of the grain boundary.
机译:显然,铝合金中晶界附近的析出物更容易成核且生长更快,但晶界如何影响S析出物的各向异性分布的机理仍然未知。在这项研究中,制备了双晶Al-Cu-Mg合金试样以获得单晶界。在30 MPa的应力时效后,分析了Al-Cu-Mg合金双晶的沉淀分布和硬度。透射电子显微镜用于分析S沉淀物的沉淀行为,并沿双晶试样上的位置测试硬度。应力时效后,晶界周围的右侧区域的硬度低于晶界周围的左侧区域的硬度。晶界周围的沉淀行为与基质中的不同。对于具有(1,-1、8)_(Al)面取向的晶界附近的左侧区域,S析出物的各向异性分布被抑制。对于具有(3、5、6)_(Al)平面取向的晶界附近的右侧区域,S析出物的各向异性分布甚至比右侧基体中更明显。影响的这种差异取决于晶界两侧周围基体的晶体学取向。

著录项

  • 来源
    《Materials Science and Engineering》 |2017年第23期|129-134|共6页
  • 作者单位

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

    School of Materials Science and Engineering, Central South University, Changsha, China,State Key Laboratory of High Performance and Complex Manufacturing, Central South University, Changsha, China;

    State Key Laboratory of High Performance and Complex Manufacturing, Central South University, Changsha, China,Light Alloy Research Institute, Central South University, Changsha, China;

    School of Materials Science and Engineering, Central South University, Changsha, China,State Key Laboratory of High Performance and Complex Manufacturing, Central South University, Changsha, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Al-Cu-Mg alloys; Bicrystal; Crystallographic orientation; Precipitation; Grain boundary; Stress-aging;

    机译:Al-Cu-Mg合金;双晶;晶体学取向;沉淀;晶界;压力老化;

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