Simulation of dislocation microstructures in two dimensions. II. Dynamic and relaxed structures

Publisher Website
Google Scholar
Abstract
For pt.I see ibid., vol.1, p.1 (1992). Dynamic dislocation structures produced by externally applied stresses and mutual interaction forces and relaxed structures formed after the removal of the applied stresses, have been simulated by a computer technique based on molecular dynamics. The model employs a two-dimensional array of straight, mixed dislocations on orthogonal slip planes. Equations of motion which account for viscous drag in glide and climb motion, inertial forces, externally applied stresses and interaction forces due to other dislocations are integrated under boundary conditions which simulate various deformation conditions. Specifically, low-temperature deformation under constant stress and cyclic stress, where dislocation motion is restricted to glide, and high-temperature deformation under constant stress, where both glide and climb are permitted, are investigated.