Planar dissociation configurations of the [1¯10] super-dislocation in stoichiometric material were investigated in terms of the generalized Peierls model, using {111} γ-surface energies which were calculated from ab initio electron theory. Dissociation into 4 Shockley partials, with the formation of an antiphase boundary and 2 complex stacking-fault ribbons, was found to be the most energetically favourable configuration. In the case of the edge super-dislocation, the predicted dissociation widths were large enough to be resolved in a weak-beam image. In the case of the corresponding configuration for the screw super-dislocation, the complex stacking-fault ribbon had a relatively small width which was expected to be beyond the limit of resolution. A 2-fold dissociation which involved superlattice intrinsic stacking faults was energetically less favourable. The recombination energy of the 2 Shockley partials into 1 super-partial was found to be equal to 0.24eV/b.

Planar Dissociations and Recombination Energy of [1¯10] Superdislocations in Ni3Al - Generalized Peierls Model in Combination with ab initio Electron Theory. Schoeck, G., Kohlhammer, S., Fähnle, M.: Philosophical Magazine Letters, 1999, 79[11], 849-57