Abstract
The dislocation structure in Ni3Al lightly deformed by cold-rolling consists of long straight dislocations parallel to the 〈101〉 direction; the dislocations are mostly dissociated into a/2〈110〉 super partials bounding the antiphase boundary (APB) and partly dissociated into a/3〈113〉 super Shockley partials bounding the superlattice intrinsic stacking fault (SISF). It is substantiated by the present study that in cold-rolled polycrystalline Ni3Al, SISF-bounding dislocations are produced as a result of the interaction between APB-bounding dislocations gliding on the different {111} slip planes, as originally proposed by Kear et al. The relation between ductilization and changes in dissociation schemes due to variation in ordering energy is discussed.