Kink nucleation in two-dimensional Frenkel-Kontorova model

摘要

A computer simulation of thermofluctuation nucleation of kinks ondislocations and their dynamics is carried out in the framework oftwo-dimensional (2D) Frenkel-Kontorova model. It is shown that at relativelylow temperatures and applied stresses the kinks can appear as a result ofdeveloping instability of phonon modes localized in the vicinity of thedislocation. The transition from this mechanism to the ordinarythermofluctuation kink nucleation with temperature increase can reveal itselfin the peculiarities of yield stress temperature dependence.