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A Peierls-Nabarro Model for Kink-Pair Generation in Screw Dislocations at Low Temperatures

  • A.H.W. Ngan (a1)


Kink-pair generation in three-fold screw dislocations in the bcc lattice is investigated within the framework of the generalised Peierls-Nabarro model. Using a piece-wise plane strain approximation, the apparent activation energy is predicted to vary with stress in a parabolic manner which is in good agreement with experimental findings.



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1.See, e.g. Suzuki, T., Koizumi, H. and Kirchner, H.O.K., Acta Metall. Mater., 43, 2177 (1995) and references therein.
2.Ngan, A.H.W., Phil. Mag. Lett., 72, p. 207 (1995).
3.Ngan, A.H.W., J. Mech. Phys. Solids, 45, p. 903 (1997).
4.Ngan, A.H.W., to appear in Phil. Mag. A.
5.Duesbury, M.S., and Vitek, V., Acta Mater., 46, 1481 (1998).
6.Ngan, A.H.W. in Strength Theory: Application, Development & Prospects for 21st Century, edited by Yu, M.H. and Fan, S.C. (Science Press, Beijing China 1998), p. 151156.
7.Duesbury, M.S., Acta Metall., 31, 1747 (1983).
8.Suzuki, T., Takeuchi, S. and Yoshinaga, H., Dislocation Dynamics and Plasticity, Springer-Verlag Berlin Heidelberg, 1991, Chp. 6.
9.Vitek, V., Crystal Lattice Defects, 5, 1 (1974).
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  • EISSN: 1946-4274
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