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.
|Number of pages
|Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
|Published - 1994 Apr