Dislocation kinematics: a molecular dynamics study in Cu

E Oren and E Yahel and G Makov, MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING, 25, 025002 (2017).

DOI: 10.1088/1361-651X/aa52a7

The kinematics and kinetics of edge and screw dislocations in FCC materials were studied by molecular dynamics, with Cu as a case study. It was found that with increasing stress screw dislocations enter into the transonic regime continuously and that they remain stable up to a velocity of about 2.2 km s(-1). Edge dislocations are limited by the transverse sound velocity at low stresses and discontinuously cross into the transonic regime at higher stresses. For sufficiently long edge dislocations, the subsonic-transonic transition is initiated by an athermal nucleation process. Finally, an expression for the velocity dependence of the dislocation mobility was derived.

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