Atomistic simulations of accelerating edge and screw dislocations were carried out to study the dynamics of dislocations in a face centered cubic metal. Using 2 different embedded atom potentials for Ni and a simple slab geometry, the Peierls stress, the effective mass, the line tension and the drag coefficient were determined. A dislocation intersecting an array of voids was used to study dynamic effects in dislocation–obstacle interactions. A pronounced effect caused by inertial overshooting was found. A dynamic line tension model was developed which reproduces the simulation results. The model could be used to easily estimate the magnitude of inertial effects in the interaction of dislocations with localized obstacles for different obstacle strengths, -spacings and temperatures.

Dynamic Aspects of Dislocation Motion - Atomistic Simulations. E.Bitzek, P.Gumbsch: Materials Science and Engineering A, 2005, 400-401, 40-4