A computational model was developed in order to study the effect of a coupling of thermally activated and drag-dependent processes during dislocation motion through an array of obstacles. The model explicitly included 3 successive reiterative stages which were typical of such motion. These were thermally activated break-off from an equilibrium position, accelerated drag-dependent motion and a transition to the next equilibrium position as controlled by the 2 previous stages. Results were presented for a wide range of dislocation velocities, applied stresses and temperatures.

Combined Model of Dislocation Motion with Thermally Activated and Drag-Dependent Stages. M.Hiratani, E.M.Nadgorny: Acta Materialia, 2001, 49[20], 4337-46