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An insight into the strain rate dependence of tensile ductility of an ultrafine grained Cu matrix nanocomposite

机译:对超细晶粒铜基纳米复合材料拉伸延展性的应变率依赖性的认识

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摘要

In this study, we observed a strong strain rate dependence of tensile ductility for an ultrafine grained Cu-5vol% Al_2O_3 nanocomposite prepared by powder compact extrusion. This dependency of tensile ductility of the material to strain rate, combined with detailed materials characterization, suggests that the strain at which nearly ideal plastic deformation occurs is associated with the magnitude of the flow stress. The measured apparent activation volume and observed alignment of Cu grains suggest that plastic deformation during this nearly perfect deformation stage is dominated by the co-operative grain boundary sliding.
机译:在这项研究中,我们观察到通过粉末压坯挤出制备的超细晶粒Cu-5vol%Al_2O_3纳米复合材料对拉伸延展性的强烈应变率依赖性。材料的拉伸延展性对应变率的这种依赖性,再加上详细的材料表征,表明发生接近理想塑性变形的应变与流动应力的大小有关。实测的表观激活量和观察到的铜晶粒排列表明,在这个接近完美的变形阶段,塑性变形主要由合作晶界滑动控制。

著录项

  • 来源
    《Materials Science and Engineering》 |2017年第14期|164-168|共5页
  • 作者单位

    Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China,Institute of Ceramics and Powder Metallurgy, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China,State Key Laboratory for Metal Matrix Materials, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;

    Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China,Institute of Ceramics and Powder Metallurgy, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China;

    Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China,Institute of Ceramics and Powder Metallurgy, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China,State Key Laboratory for Metal Matrix Materials, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;

    State Key Laboratory for Metal Matrix Materials, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;

    Electron Microscope Unit, The University of New South Wales, Sydney 2052, Australia;

    School of Materials Science and Engineering, The University of New South Wales, Sydney 2052, Australia;

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

    Ultrafine grained copper matrix; nanocomposites; Tensile ductility; Strain rate sensitivity; Deformation mechanisms;

    机译:超细晶粒铜基体;纳米复合材料拉伸延展性;应变率敏感性;变形机制;

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