Molecular dynamics methods were used to simulate dislocation intersections, in samples containing 1.6 x 106 atoms, by using an embedded atom method potential. The results showed that, following the intersection of 2 right-hand screw dislocations of opposite sign, there was an extended jog (corresponding to a row of 1/3 vacancies) in the intersected dislocation, and a trail of vacancies behind the moving dislocation. Following the intersection of screw dislocations of the same sign, there was an extended jog (corresponding to a row of 1/3 interstitials) in the intersected dislocation and a trail of interstitials behind the moving dislocation. Following the intersection of screw and edge dislocations with differing Burgers vector, there was a constriction that corresponded to one 1/3 vacancy in the edge dislocation; and no point-defects behind the screw dislocation. When a moving screw dislocation intersected an edge dislocation having the same Burgers vector, the point of intersection split into 2 constrictions which corresponded to one 1/3 vacancy and 1/3 interstitial, respectively. The moving screw dislocation could pass the edge dislocation only after forming the 2 constrictions; which could move along the line of intersection of the two slip planes, meet and annihilate.

Molecular Dynamics Simulation of Dislocation Intersections in Aluminium. M.Li, W.Y.Chu, C.F.Qian, K.W.Gao, L.J.Qiao: Materials Science and Engineering A, 2003, 363[1-2], 234-41