ATOMISTIC STUDY OF EDGE DISLOCATIONS IN FCC METALS: DRAG AND INERTIAL EFFECTS

摘要

Atomistic simulations of an accelerating edge dislocation were carried out to study drag and inertial effects. Using an embedded atom potential for nickel the Peierls stress, the effective mass and the drag coefficient of an edge dislocation was determined for different temperatures and stresses in a simple slab geometry. A dislocation intersecting a void is used as a model to demonstrate the importance of inertial effects for dynamically overcoming short range obstacles. Significant effects are found even at room temperature. Including inertial effects in discrete dislocation dynamics simulations allows to reproduce the atomistic results.