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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的纳米晶化：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>取向单晶铜的纳米晶化。首先研究了激光冲击压缩和直接机械冲击压缩之间的差异。为了揭示纳米晶化的内在机理，提出并分析了位错的演化和亚晶界的形成。使用Schmid定律和von Mises屈服准则分析位错的形核。提出了位错演化和相应的反应。为了更好地理解位错的演化，将详细讨论典型的热物理量，包括应力和应变。研究了位错之间相互作用引起的位错单元，壁和纠缠的形成，并分析了相互作用的机理。

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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：位错;激光冲击压缩;超快激光;分子动力学;

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