Glide of Jogged Dislocations

The glide of jogged dislocations is considered. Rate equations are presented to describe the motion of dislocations containing interstitial-producing jogs in both the low-stress, quasi-equilibrium regime of behavior and the high-stress, thermally activated regime. The concept of point forces acting at pinning points is introduced. Extended jogs are considered and are shown to always dissociate such that the sessile jog partial is in trailing position. Sessile jogs in edge dislocations are found to be predominantly vacancy producing. Mechanisms are presented for stacking-fault tetrahedron formation at jogs.