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The significance of self-annealing at room temperature in high purity copper processed by high-pressure torsion

机译:高压扭转加工的高纯铜在室温下自退火的意义

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摘要

High purity copper was processed by high-pressure torsion (HPT) at room temperature and then stored at room temperature for periods of up to 6 weeks to investigate the effect of self-annealing. Hardness measurements were recorded both at 48 h after HPT processing and after various storage times. The results show the occurrence of recovery near the edges of the discs after processing through 1/2 and 1 turn and this leads to a significant drop in the measured hardness values which is accompanied by microstructural evidence for abnormal grain growth. Conversely, there was no recovery, and therefore no hardness drops, after processing through 5 and 10 turns. X-ray line profile analysis was used to determine the crystallite sizes and dislocation densities at 1 h after HPT and after storage for different times. The results show a good thermal stability in high purity Cu after processing through more than 1 turn of HPT but care must be exercised in recording hardness measurements when processing through only fractional or very small numbers of turns.
机译:高纯度铜在室温下通过高压扭转(HPT)进行处理,然后在室温下保存长达6周,以研究自退火的效果。在HPT处理后48小时和各种存储时间后记录硬度测量值。结果表明,经过1/2和1圈加工后,在圆盘边缘附近出现了恢复现象,这导致测得的硬度值显着下降,并伴有晶粒异常生长的微观结构证据。相反,经过5到10圈加工后没有恢复,因此没有硬度下降。 X射线线轮廓分析用于确定HPT后1小时和储存不同时间后的微晶尺寸和位错密度。结果表明,经过1匝以上的HPT加工后,高纯度铜具有良好的热稳定性,但是当仅进行零分或极少量的匝数加工时,在记录硬度测量值时必须格外小心。

著录项

  • 来源
    《Materials Science and Engineering》 |2016年第22期|55-66|共12页
  • 作者单位

    Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK;

    Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089-1453, USA;

    Department of Manufacturing Engineering, College of Technological Studies, P.A.A.E.T., P.O. Box 42325, Shuwaikh 70654, Kuwait;

    Department of Mechanical Engineering, College of Engineering & Petroleum, Kuwait University, P.O. Box 5969, Safat 13060, Kuwait;

    Department of Manufacturing Engineering, College of Technological Studies, P.A.A.E.T., P.O. Box 42325, Shuwaikh 70654, Kuwait;

    Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK,Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089-1453, USA;

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

    Copper; Grain growth; Hardness; High-pressure torsion; Self-annealing;

    机译:铜;谷物生长;硬度;高压扭力;自退火;

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