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Anelastic behavior of Mg-Al and Mg-Zn solid solutions

机译：Mg-Al和Mg-Zn固溶体的弹性行为

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摘要

The anelastic strain measured using tensile loading-unloading loops in pure Mg and in binary solid solutions of Mg-Al and Mg-Zn, with contents of 0.5, 2 and 9 at% Al and 0.8 and 2.3 at% Zn, was correlated with available data for the area fractions and number densities of twins, for applied strains of up to 3%. For pure Mg, no anelastic strain was observed up to about 4% area fraction of twins and at an applied plastic strain of ～1.7 × 10~(-4), after which it increased rapidly, levelling off at a plastic strain of -1%. The alloys followed the same pattern, but from much smaller minimum area fractions of twinning, < 1% for Mg-Zn, and ~2% for Mg-Al, at applied plastic strains of ～2.5×10~(-4) and ～3.1×10~(-4), respectively. The anelastic strain saturated at a maximum value of -0.002 for all alloys, save for the 9%A1 for which it reached a much larger level (-0.004). The correlation with the number density of twins followed similar patterns. For a given alloy, the magnitude of the anelastic effect can be related to the applied stress in excess of that required to initiate microplasticity. The results are discussed in terms of the solid solution hardening and softening effects upon basal and prism slip in the dilute alloys, and of short range order upon slip and twinning in concentrated Mg-Zn.
机译：使用拉伸加载/卸载回路在纯Mg和Mg-Al和Mg-Zn的二元固溶体中测量的非弹性应变与可用的铝含量相关，其中Al，Mg-Zn的含量分别为0.5、2和9 at％，Zn的含量为0.8和2.3 at％施加的应变高达3％的双胞胎的面积分数和数密度的数据。对于纯Mg，在孪晶的约4％面积分数处未观察到无弹性应变，在施加的塑性应变为〜1.7×10〜（-4）时，无弹性应变，随后迅速增加，在塑性应变为-1时趋于平稳％。合金遵循相同的模式，但在施加的塑性应变为〜2.5×10〜（-4）和〜时，孪生的最小孪生面积分数要小得多，Mg-Zn <1％，Mg-Al〜2％。分别为3.1×10〜（-4）对于所有合金，非弹性应变均以-0.002的最大值饱和，但9％A1的应变达到了更大的水平（-0.004）。与双胞胎数密度的相关性遵循相似的模式。对于给定的合金，非弹性效应的大小可能与所施加的应力有关，该应力超过了引发微塑性所需的应力。讨论了在稀合金中固溶对基体和棱柱滑动的硬化和软化作用，以及在浓Mg-Zn中对滑动和孪生的短程有序作用的结果。

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  • 来源
    《Materials Science and Engineering》 |2017年第1期|387-392|共6页
  • 作者

    D. Nagarajan; X. Ren; C.H. Caceres;

  • 作者单位

    ARC-Cerwe of Excellence for Design in Light Metals, Materials Engineering, School of Engineering, The University of Queensland, Brisbane, QLD 4072, Australia.,Department of Metallurgical and Materials Engineering, National Institute of Technology (NIT) Rourkela, Rourkela 769 008, Odisha, India;

    ARC-Cerwe of Excellence for Design in Light Metals, Materials Engineering, School of Engineering, The University of Queensland, Brisbane, QLD 4072, Australia.,School of Materials Science and Engineering, Shandong University, Jinan, China;

    ARC-Cerwe of Excellence for Design in Light Metals, Materials Engineering, School of Engineering, The University of Queensland, Brisbane, QLD 4072, Australia.;

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

    Mg-Al; Mg-Zn; Twinning; Quantitative metallography; Solid solution hardening/softening; Short range order;

    机译：镁铝;镁锌;孪生;定量金相学;固溶体硬化/软化;短程订单;

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