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The Strain-rate Dependence Of The Nanoindentation Stress Of Gold At 300 K: A Deformation Kinetics-based Approach

机译:金在300 K下纳米压痕应力的应变率依赖性:基于变形动力学的方法

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摘要

Indentation tests involving a constant-loading rate stage followed by a constant-load stage were performed on annealed and 20% cold-worked Au to investigate the effect of indentation depth and initial dislocation density on the indentation deformation process. The indentation strain rate data were analyzed in terms of an obstacle-limited dislocation glide mechanism. The apparent activation energy was of the order of 0.16 μb~3 and was neither a function of initial indentation depth nor cold work. The results of Haasen plot activation analysis and direct transmission electron microscopy (TEM) observations indicate that more mechanical work must be applied during the constant-loading rate stage due to the large amount of work hardening compared with the constant-load stage where considerably more dislocation recovery occurs.
机译:在退火和20%的冷加工Au上进行了包括恒负荷率阶段和恒负荷阶段的压痕测试,以研究压痕深度和初始位错密度对压痕变形过程的影响。压痕应变率数据是根据障碍物有限的位错滑移机制进行分析的。表观活化能约为0.16μb〜3,既不是初始压痕深度的函数,也不是冷加工的函数。 Haasen曲线活化分析和直接透射电子显微镜(TEM)观察的结果表明,与恒定负载阶段相比,由于大量的加工硬化,在恒定负载率阶段必须进行更多的机械加工。恢复发生。

著录项

  • 来源
    《Journal of Materials Research》 |2009年第4期|1456-1465|共10页
  • 作者单位

    Department of Mechanical and Materials Engineering, Faculty of Engineering, The University of Western Ontario, London, Ontario N6A 5B9, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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