The forest dislocation as a source of cross-slip

Abstract

General analytic expressions for the components of the interaction force between two straight skew dislocations with arbitrary Burgers vectors are derived. The interaction between two orthogonal dislocations is considered in detail and used to discuss the interaction between a gliding screw dislocation and an orthogonal forest dislocation. When the two dislocations have parallel Burgers vectors there is a very large, long-ranged force component on the screw dislocation in the cross-slip direction. The significance of this force in relation to dipole formation is discussed and shown to be pertinent to hexagonal and cubic structures.