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Nanovoid growth in nanocrystalline metal by dislocation shear loop emission

机译：位错剪切环发射在纳米晶体金属中的纳米空隙生长

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摘要

Experimental evidence and molecular dynamics simulations of void growth indicate that dislocation shear loop emission is a viable mechanism of void growth. Based on this mechanism, a theoretical model to describe the growth of nanovoid at triple junction of nanocrystalline metal under equal biaxial remote stress is suggested. In this model, it is proposed that emission of dislocation is caused by the interaction between applied stress and image stress introduced by existing nanovoids. The critical stress is derived for emission of dislocation by considering the effects of surface stress. Within our description, dislocations emitted from surface of nanovoid are stopped at grain boundaries and the stress field generated by arrested dislocations can prevent further dislocation emission. The maximum number of dislocations emitted from surface of nanovoid, as a representation of the nanovoid growth, is analyzed as a function of grain size.
机译：空隙生长的实验证据和分子动力学模拟表明位错剪切环发射是空隙生长的可行机制。基于这种机理，提出了一个理论模型来描述纳米孔隙在相同的双轴远程应力下在纳米晶金属的三重结处的生长。在该模型中，提出位错的发射是由施加的应力和现有纳米空隙引入的图像应力之间的相互作用引起的。考虑到表面应力的影响，导出了用于释放位错的临界应力。在我们的描述中，从纳米空隙的表面发出的位错在晶界处停止，由位错滞留产生的应力场可以防止进一步的位错发射。作为纳米空隙生长的代表，从纳米空隙的表面发射的最大位错数量被分析为晶粒尺寸的函数。

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  • 来源
    《Materials Science and Engineering》 |2011年第17期|p.5428-5434|共7页
  • 作者

    Lu Wang; Jianqiu Zhou; Yingguang Liu; Shu Zhang; Ying Wang; Wei Xing;

  • 作者单位

    School of Mechanical and Power Engineering, Nanjing University ofTechnoIogy, Nanjing, Jiangsu 210009, China;

    School of Mechanical and Power Engineering, Nanjing University ofTechnoIogy, Nanjing, Jiangsu 210009, China,Department of Mechanical Engineering, Wuhan Institute ofTechnoIogy, Wuhan, Hubei 430070, China;

    School of Mechanical and Power Engineering, Nanjing University ofTechnoIogy, Nanjing, Jiangsu 210009, China;

    School of Mechanical and Power Engineering, Nanjing University ofTechnoIogy, Nanjing, Jiangsu 210009, China;

    School of Mechanical and Power Engineering, Nanjing University ofTechnoIogy, Nanjing, Jiangsu 210009, China;

    School of Mechanical and Power Engineering, Nanjing University ofTechnoIogy, Nanjing, Jiangsu 210009, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    void growth; nanocrystalline metal; dislocation shear loop; grain boundaries;

    机译：空隙生长;纳米晶金属;位错剪切环;晶界;

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