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Plastic deformation behavior during unloading in compressive cyclic test of nanocrystalline copper

机译：纳米晶铜压缩循环试验中卸荷时的塑性变形行为

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摘要

Deformed coarse-grained polycrystalline metals always unload elastically where permanent dislocation network well-developed in the loading regime hinders the movement of dislocations and allows only the elastic relaxation of stress. Such elastic unloading behavior is, however, unexpected in nanocrystalline metals because the dislocation network cannot effectively form inside nanometer-scale grains. In this work, we report the experimental finding of significant plastic deformation that emerges in the unloading regime in the compressive cyclic test at room temperature of nanocrystalline Cu. The magnitude of plastic strain produced during unloading depends strongly on loading and unloading rates. This plastic unloading behavior arises from the rapid absorption of dislocations accumulated during loading, which was quantitatively interpreted by performing the incremental unloading test and developing a relationship between the dislocation density and the loading and unloading rates based on the models of the statistical absorption of dislocations by grain boundaries and the dislocation emission from grain boundary ledges. Concurrently, the evolution of deformation structures during the cyclic deformation was also analyzed in terms of the interactions of gliding dislocation-twin boundaries.
机译：变形的粗晶粒多晶金属总是弹性地卸载，在加载状态下充分形成的永久性位错网络阻碍了位错的运动，并且仅允许应力的弹性松弛。但是，这种弹性卸载行为在纳米晶体金属中是出乎意料的，因为位错网络无法有效地在纳米级晶粒内部形成。在这项工作中，我们报告了在室温下纳米晶Cu的压缩循环试验中在卸载状态下出现的显着塑性变形的实验发现。卸载过程中产生的塑性应变的大小在很大程度上取决于加载和卸载速率。这种塑性卸载行为是由于加载过程中积累的位错的快速吸收而引起的，这是通过进行增量卸载试验并基于位错的统计吸收模型建立了位错密度与加载和卸载速率之间的关系来定量解释的。晶界和晶界壁架的位错发射。同时，还根据滑动位错-孪生边界的相互作用分析了循环变形过程中变形结构的演化。

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  • 来源
    《Materials Science and Engineering》 |2016年第10期|999-1009|共11页
  • 作者

    Jiangjiang Hu; Jinyu Zhang; Zhonghao Jiang; Xiangdong Ding; Yusheng Zhang; Shuang Han; Jun Sun; Jianshe Lian;

  • 作者单位

    Key Laboratory of Automobile Materials, College of Materials Science and Engineering Jilin University, Nanling Campus, Changchun 130025, China;

    State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

    Key Laboratory of Automobile Materials, College of Materials Science and Engineering Jilin University, Nanling Campus, Changchun 130025, China;

    State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

    Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China;

    Key Laboratory of Automobile Materials, College of Materials Science and Engineering Jilin University, Nanling Campus, Changchun 130025, China;

    State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

    Key Laboratory of Automobile Materials, College of Materials Science and Engineering Jilin University, Nanling Campus, Changchun 130025, China;

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

    Nanocrystalline copper; Plastic deformation; Dislocation; Grain boundary; Twin boundary;

    机译：纳米晶铜;塑性变形;错位;晶界;双边界;

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