In nearly-stoichiometric Ni3Al deformed in compression above the temperature where the flow stress peaks, super-dislocations may be dissociated either by glide on their {001} slip plane or by climb, preferentially on {310) FTBC planes. Conditions that control the choice of these specific configurations were examined. Simple rules were introduced in order to determine the equivalence between antiphase boundaries and to identify the occurrence of composition violations. It was shown that non-conservative antiphase boundaries occurred principally for antiphase boundary configurations where the crystal composition was conserved and at dislocation orientations with a strong edge component. The set of antiphase boundary energies which was available in this material was inconsistent with a pair-wise model limited to second neighbors. The fact that for a mixed dislocation, the most favorable configurations may not coincide with the plane of lowest antiphase boundary energy, was explained within the frame of elastic anisotropy, according to the dislocation character and to the relative values of antiphase boundary energies on {310} and {001}.

Climb Dissociation of {310} Planes in Nearly-Stoichiometric Ni3Al. Douin, J., Beauchamp, P., Veyssiere, P.: Philosophical Magazine A, 1988, 58[6], 923-35