Core structures of non screw1/2(111) dislocations on (112) planes of b.c.c. crystals. I. Core structure in an unstressed crystal

Abstract

Atomistic calculations of the core structure of four different non screw ¹/₂(111) dislocations lying on a (112) plane have been made using three different central interatomic forces. The cores of all the dislocations studied have been found to be similar: planar, asymmetrical and spread into three parallel (112) planes. The results are interpreted using differential displacement maps and the concept of a continuous distribution of the Burgers vector, and are discussed in terms of the restoring forces for three layer generalized stacking faults on (122) planes.