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Dislocation core radii near elastic stability limits

机译：位错半径接近弹性稳定性极限

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摘要

Recent studies of transition metal alloys with compositions that place them near their limits of elastic stability [e.g., near the body-centered-cubic (BCC) to hexagonal-close-packed (HCP) transition] suggest interesting behavior for the dislocation cores. Specifically, the dislocation core size is predicted to diverge as the stability limit is approached. Here a simple analysis rooted in elasticity theory and the computation of ideal strength is used to analyze this divergence. This analysis indicates that dislocation core radii should diverge as the elastic limits of stability are approached in the BCC, HCP, and face-centered-cubic (FCC) structures. Moreover, external stresses and dislocation-induced stresses also increase the core radii. Density functional theory based total-energy calculations are combined with anisotropic elasticity theory to compute numerical estimates of dislocation core radii.
机译：过渡金属合金的最新研究表明其成分接近其弹性稳定性极限（例如，靠近体心立方（BCC）到六方密堆积（HCP）的过渡]，表明位错核具有有趣的行为。具体而言，随着接近稳定极限，位错核心尺寸预计会发散。这里，以弹性理论为基础的简单分析和理想强度的计算用于分析这种差异。该分析表明，随着在BCC，HCP和面心立方（FCC）结构中达到稳定性的弹性极限，位错核心半径应发散。此外，外部应力和位错引起的应力也会增加芯半径。将基于密度泛函理论的总能量计算与各向异性弹性理论相结合，以计算位错核心半径的数值估计。

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  • 来源
    《Physical review》 |2013年第13期|134106.1-134106.7|共7页
  • 作者

    C. A. Sawyer; J. W. Morris Jr.; D. C. Chrzan;

  • 作者单位

    Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA;

    Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA;

    Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA;

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

    deformation, plasticity, and creep;

    机译：变形;可塑性和蠕变;

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