The elastic displacement field of a jogged screw dislocation was obtained analytically from the Burgers equation. By using this analytical solution, a pair of jogs on a screw dislocation was incorporated into molecular dynamics simulations. The dislocation line bowed out between 2 jog pinning-points and broke away when the line tension of the dislocation exceeded a critical value. The creation of vacancies and interstitials was observed during the non-conservative motion of the jogged screw dislocation. The vacancies were formed in a tube along [0¯1¯1], while the interstitials were inserted into atom columns parallel to the z-axis. When the separation between 2 jogs was small, the jogs could move towards each other and annihilate. An interstitial-producing jog experienced a greater dragging effect than did a vacancy-producing jog.

Investigation of Jog Motion in γ-TiAl via Molecular Dynamics. M.Li, S.J.Zhou: Philosophical Magazine Letters, 1999, 79[10], 773-84