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首页> 外文期刊>Materials Science and Engineering >Strain rate effects of dynamic compressive deformation on mechanical properties and microstructure of CoCrFeMnNi high-entropy alloy
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Strain rate effects of dynamic compressive deformation on mechanical properties and microstructure of CoCrFeMnNi high-entropy alloy

机译：动态压缩变形对CoCrFeMnNi高熵合金力学性能和组织的应变率影响

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摘要

In this work, the effects of strain rate on mechanical deformation and microstructural evolution of CoCrFeMnNi high-entropy alloy (HEA) under quasi-static and dynamic compression were investigated. The HEA exhibited high strain-rate sensitivity values (m = 0.028) of yield strength under quasi-static conditions. In particular, due to the viscous drag effect, the variation of yield strength with strain rate under dynamic compression was much larger than that under quasi-static compression. Microstructural analysis using electron backscatter diffraction shows profuse twinning under both conditions. The dynamically deformed specimens exhibited strongly localized deformation regions (i.e., adiabatic shear bands). The process of dynamic compressive behavior in this HEA is competitive between hardening by dislocation and twinning, and thermal softening. To analyze numerically the flow behavior of the HEA under dynamic conditions, the modified Johnson-Cook model considering adiabatic temperature rise was employed. The modified Johnson-Cook model offered good agreement with experimental results regarding dynamic flow curves of this HEA.
机译：在这项工作中，研究了在静态和动态压缩下，应变速率对CoCrFeMnNi高熵合金（HEA）的机械变形和组织演变的影响。在准静态条件下，HEA表现出高的屈服强度应变率敏感性值（m = 0.028）。特别地，由于粘性阻力效应，动态压缩下屈服强度随应变率的变化远大于准静态压缩下的屈服强度随应变率的变化。使用电子背散射衍射的微结构分析显示在两种条件下均存在大量孪晶。动态变形的样品表现出强烈的局部变形区域（即绝热剪切带）。该HEA中动态压缩行为的过程在位错和孪晶硬化与热软化之间具有竞争性。为了对HEA在动态条件下的流动行为进行数值分析，采用了考虑绝热温升的改进Johnson-Cook模型。改进的Johnson-Cook模型与该HEA的动态流动曲线的实验结果吻合良好。

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  • 来源
    《Materials Science and Engineering》 |2018年第14期|155-163|共9页
  • 作者

    Jeong Min Park; Jongun Moon; Jae Wung Bae; Min Ji Jang; Jaeyeong Park; Sunghak Lee; Hyoung Seop Kim;

  • 作者单位

    Department of Materials Science and Engineering, POSTECH (Pohang University of Science and Technology);

    Department of Materials Science and Engineering, POSTECH (Pohang University of Science and Technology);

    Department of Materials Science and Engineering, POSTECH (Pohang University of Science and Technology);

    Department of Materials Science and Engineering, POSTECH (Pohang University of Science and Technology);

    Department of Materials Science and Engineering, POSTECH (Pohang University of Science and Technology);

    Department of Materials Science and Engineering, POSTECH (Pohang University of Science and Technology),Center for High Entropy Alloys, POSTECH (Pohang University of Science and Technology);

    Department of Materials Science and Engineering, POSTECH (Pohang University of Science and Technology),Center for High Entropy Alloys, POSTECH (Pohang University of Science and Technology);

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  • 正文语种 eng
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  • 关键词

    High-entropy alloy (HEA); Dynamic deformation; Split-Hopkinson pressure bar (SHPB); Deformation twinning; Adiabatic shear band;

    机译：高熵合金（HEA）;动态变形;Split-Hopkinson压力棒（SHPB）;变形孪生;绝热剪切带;

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