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Energy, stability, and peierls stress of glide dislocations in anisotropie BCC crystals

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Abstract

The elastic energyE of a straight glide dislocation in bec crystals is analyzed as a function of crystal orientation. Approximate energy functions are obtained for dislocations on the 110, 112, and 123 slip planes. Regions of instability for glide dislocations are found to exist only in highly anisotropic crystals, Li, Na, K, and β-brass. The Peierls stresses op and the widths of edge and screw dislocations are also analyzed. For most common bec crystals, the following inequalities hold: E(110) < E(123) < E(112) for edge dislocations,op(110) <op(112) <op(123) for both edge and screw, and (op)e < (op)s between the edge and screw on the same slip plane, where the subscript p stands for Peierls, e for edge, s for screw, and the superscripts refer to the slip planes.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Science, Lehigh University, Bethlehem, Pa.

    Y. T. Chou (Professor)

  2. Bell Aerospace Company, Buffalo, N. Y.

    G. T. Sha (Research Scientist)

Authors
  1. Y. T. Chou
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  2. G. T. Sha
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G. T. SHA, formerly Research Assistant, Department of Metallurgy and Materials Science, Lehigh University

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Chou, Y.T., Sha, G.T. Energy, stability, and peierls stress of glide dislocations in anisotropie BCC crystals. Metall Trans 3, 2857–2863 (1972). https://doi.org/10.1007/BF02652853

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  • DOI: https://doi.org/10.1007/BF02652853

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