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Characterization of microstructure evolution after severe plastic deformation of pure copper with continuous columnar crystals

机译：具有连续柱状晶体的纯铜严重塑性变形后的微观组织演化特征

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摘要

Pure copper bar with continuous columnar crystals was fabricated by continuous unidirectional solidification. The bar with orientation preference along [001] exhibited novel plastic deformation ability with total true strain over 13.5 during rolling and drawing at room temperature without annealing. Microstructure analysis and in situ observation of tensile test were performed to investigate the mechanism of plastic deformation. Results exhibit that the novel plastic deformation ability of copper bar is beneficial from the absence of transverse grain boundary as well as small angle grain boundary of the continuous columnar microstructure. The existence of cell structure, recrystallization and deformation twin leads to grain rotation during deformation and enhances the orientation preference of the continuous columnar crystals, enabling copper bar a high ability for further deformation.
机译：通过连续单向凝固制备具有连续柱状晶体的纯铜棒。取向为[001]的钢筋显示出新颖的塑性变形能力，在室温下进行轧制和拉伸时无需退火，总真实应变超过13.5。进行了显微组织分析和拉伸试验的原位观察，以研究塑性变形的机理。结果表明，铜棒的新型塑性变形能力是有益的，因为没有连续的柱状组织的横向晶界和小角度晶界。晶胞结构，再结晶和形变孪生的存在导致形变过程中晶粒旋转，并增强了连续柱状晶体的取向偏好，使铜棒具有更高的进一步形变能力。

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  • 来源
    《Materials Science and Engineering》 |2010年第19期|P.4750-4757|共8页
  • 作者

    Kewei Gao; Meiyan Liu; Fenglei Zou; Xiaolu Pang; Jianxin Xie;

  • 作者单位

    School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;

    rnSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;

    rnSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;

    rnSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;

    rnSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;

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

    continuous casting; TEM; EBSD; plasticity;

    机译：连铸;TEM;EBSD;可塑性;

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