Velocity of Slowly Moving Dislocation

Abstract

It is assumed that the observed dislocation velocity is the average velocity during the successive jumps, and that the jumping distances are large compared with the atomic spacing. The excitation probabilities for large jumps are calculated the forces on dislocation, in which the thermal effects are introduced as the fluctuation of the local shear stress. The dislocation velocity in otherwise perfect crystals of relatively large Peierls stress are obtained as the functions of applied stress and temperature.