Nucleation of trapezoidal kink pairs on a Peierls potential
- 1 April 1994
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine A
- Vol. 69 (4) , 805-820
- https://doi.org/10.1080/01418619408242521
Abstract
The activation energy ΔH∗ for forming a kink pair of trapezoidal shape in a dislocation in a Peierls potential is calculated by considering the long-range elastic interaction between the dislocation segments. The shapes and energies obtained in this three-parameter model closely resemble those obtained from the continuous line-tension approximation, except at low stresses where ΔH∗ is well approximated by a square-root-dependence on the stress. If the potential is smooth, the stress dependence of the activation energy is also smooth. For a camel-hump potential, with an intermediate minimum, a discontinuity appears in the stress-dependence.Keywords
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