Interaction of Dislocations with Atomic Order in Solid Solutions

Abstract

The author herein proposes a theory on the mechanism of the interaction between a dislocation and the atomic order, which is based on the coupling of the stress field of dislocation with the lattice distortion accompanied by ordering in superlattice alloys. The interaction energy and the locking force of the atomic configuration around the dislocation against its motion are calculated by using Iwata’s method. The interaction energy and the locking force for an edge dislocation reveals a sharp peak at the temperature near the Curie point of order-disorder transformation, while such a sharp peak is absent in a screw dislocation. The values for a screw dislocation is about 1∼10% of those for an edge dislocation.