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Nanocrystallization in single-crystal copper under laser shock compression: A molecular dynamics study

机译：激光冲击压缩下单晶铜中的纳米晶体：分子动力学研究

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摘要

Molecular dynamics simulations are performed to investigate nanocrystallization of 100 -oriented monocrystal copper subjected to ultrafast laser shock compression. The differences between laser shock compression and direct mechanical shock compression are first studied. To reveal the intrinsic mechanism of nanocrystallization, the evolution of dislocations and the formation of sub-grain boundaries are presented and analyzed in detail. The nucleation of dislocations is analyzed using Schmid's law and the von Mises yield criterion. Dislocation evolution and the corresponding reactions are presented. To better understand the evolution of dislocations, typical thermophysical quantities, including stress and strain, are discussed in detail. The formation of dislocation cells, walls and entanglements due to interactions between dislocations is investigated, and the mechanism of the interactions is analyzed.
机译：进行分子动力学模拟以研究经受超快激光冲击压缩的<100 oriented单晶铜的纳米晶体化。首先研究激光冲击压缩和直接机械冲击压缩之间的差异。为了揭示纳米晶体的内在机制，详细介绍并分析了脱臼的进化和亚晶界的形成。使用Schmid的法律分析脱位成核，von MISES收益标准分析。呈现脱位进化和相应的反应。为了更好地理解脱位的演变，详细讨论了典型的热理量，包括应力和菌株。研究了脱位细胞，由于脱位之间的相互作用而形成的位错细胞，壁和缠结，并分析相互作用的机制。

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  • 来源
    《Materials Science and Engineering》 |2019年第3期|115-127|共13页
  • 作者

    Xiong Qi-lin; Kitamura Takayuki; Li Zhenhuan;

  • 作者单位

    Huazhong Univ Sci & Technol Dept Mech 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China|Hubei Key Lab Engn Struct Anal & Safety Assessmen Luoyu Rd 1037 Wuhan 430074 Hubei Peoples R China|Kyoto Univ Dept Mech Engn & Sci Nishikyo Ku Kyoto 6158540 Japan;

    Kyoto Univ Dept Mech Engn & Sci Nishikyo Ku Kyoto 6158540 Japan;

    Huazhong Univ Sci & Technol Dept Mech 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China|Hubei Key Lab Engn Struct Anal & Safety Assessmen Luoyu Rd 1037 Wuhan 430074 Hubei Peoples R China;

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

    Dislocation; Laser shock compression; Ultrafast laser; Molecular dynamics;

    机译：错位;激光冲击压缩;超快激光;分子动力学;

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