Kink nucleation in two-dimensional Frenkel-Kontorova model

Details Kink nucleation in two-dimensional Frenkel-Kontorova model Kink nucleation in two-dimensional Frenkel-Kontorova model

2002-06-22

arxiv.org/abs/cond-mat/0206428v1

Physics

Condensed Matter

Materials Science

REVTeX 4 style, 4 pages, 4 figures, to appear in Phys. Rev. E, August 1, 2002

Scientific paper

10.1103/PhysRevE.66.027201

A computer simulation of thermofluctuation nucleation of kinks on dislocations and their dynamics is carried out in the framework of two-dimensional (2D) Frenkel-Kontorova model. It is shown that at relatively low temperatures and applied stresses the kinks can appear as a result of developing instability of phonon modes localized in the vicinity of the dislocation. The transition from this mechanism to the ordinary thermofluctuation kink nucleation with temperature increase can reveal itself in the peculiarities of yield stress temperature dependence.

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