It was recalled that deformation twinning was important to the plasticity of hexagonal close-packed metals. However, little was known about the dynamics of the mechanisms that controlled twin-boundary motion. With the exception of the {11▪2} twin, atomic shuffles were required for the glide of twinning dislocations, and hence boundary movement was temperature-dependent. A computer method was developed in order to simulate a step, with dislocation character, in a boundary with full periodicity in the boundary plane. That is, along both the direction of the line of the defect and its direction of motion. It could be used to investigate the properties of such interfaces as the defects in them moved over large distances. The nature of the method was explained and it was applied to study of the motion of twinning dislocations in the {11▪2} boundary as a function of applied stress and temperature. A new reaction at the boundary was described that led to the creation of a (c+a) crystal dislocation and a {11▪1} micro-twin.

Modelling the Motion of {11▪2} Twinning Dislocations in the HCP Metals. A.Serra, D.J.Bacon: Materials Science and Engineering A, 2005, 400-401, 496-8