The dislocation structure resulting from the compression of single crystals of Ni3(Al,Ti) at room temperature was studied using transmission electron microscopy. Deformed samples subjected to true strains of 1% or 9% were sliced parallel to (111) and (010) planes. Weak-beam imaging methods revealed the (010) planes to be the dissociation planes of the screw superlattice dislocations. Transition of superlattice dislocations from (111) onto (010) planes via the Kear-Wilsdorf mechanism was identified. Remarkable dislocation movement on (010) planes was found. The flow stress was interpreted as involving dislocation interactions on octahedral and cube planes. Measurements of the antiphase-boundary energies on (111) and (010) planes yielded a value of 250mJ/m2 in both cases.

Weak-Beam Study of Superlattice Dislocations Moving on Cube Planes in Ni3(Al,Ti) Deformed at Room Temperature. A.Korner: Philosophical Magazine A, 1988, 58[3], 507-22