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Uniaxial ratchetting of extruded AZ31 magnesium alloy: Effect of mean stress

机译：挤压AZ31镁合金的单轴棘轮：平均应力的影响

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摘要

The uniaxial ratchetting of extruded AZ31 magnesium alloy was investigated in the cyclic tests with different mean stresses and at room temperature. The prescribed mean stresses and corresponding stress amplitudes were chosen to make the different plastic deformation mechanisms such as dislocation slipping, twinning and detwinning occur individually or simultaneously during the cyclic deformation of the AZ31 magnesium alloy with a hexagonal close packed crystal structure, and then the effect of mean stress on the uniaxial ratchetting of the magnesium alloy was discussed. It is seen that ratchetting occurs in the AZ31 magnesium alloy during the stress-controlled cyclic loading, but different evolution features are observed in the uniaxial ratchetting tests with different mean stresses. Different ratchetting behaviors are determined by the different deformation mechanisms of extruded AZ31 magnesium alloy occurring in the tensile and compressive parts of cyclic loading. A sigmoidal stress-strain hysteresis loop of the magnesium alloy presented in the cyclic tension-compression tests with some suitable mean stresses and stress amplitudes is caused by the twinning/detwinning deformation mechanism, which should be reasonably considered in constructing a cyclic constitutive model to describe the uniaxial ratchetting of magnesium alloys.
机译：在循环试验中，在不同的平均应力和室温下，对挤压的​​AZ31镁合金的单轴棘轮进行了研究。选择规定的平均应力和相应的应力振幅，以使具有六方密堆积晶体结构的AZ31镁合金的循环变形过程中，分别或同时发生不同的塑性变形机制，如位错滑移，孪晶和解孪晶。讨论了平均应力对镁合金单轴咬合的影响。可以看出，在应力控制的循环载荷过程中，AZ31镁合金中发生了棘齿缝隙，但是在单轴棘齿缝隙试验中，在平均应力不同的情况下观察到了不同的演化特征。通过在循环载荷的拉伸和压缩部分中发生挤压的AZ31镁合金的不同变形机制，可以确定不同的棘轮行为。孪生/脱孪形变形机制引起了周期性拉伸-压缩试验中镁合金的S形应力-应变滞后回线，并具有一些合适的平均应力和应力振幅，在构造循环本构模型以进行描述时应合理考虑镁合金的单轴棘轮。

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  • 来源
    《Materials Science and Engineering》 |2014年第23期|318-327|共10页
  • 作者

    Guozheng Kang; Chao Yu; Yujie Liu; Gaofeng Quan;

  • 作者单位

    State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, Sichuan 610031 PR China;

    School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China;

    School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China;

    School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China;

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

    Magnesium alloy; Ratchetting; Twinning/detwinning; Dislocation; Mean stress;

    机译：镁合金盗窃孪生/解脱错位;平均压力;

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