Separations were calculated for the partials of superlattice dislocations in Cu2NiZn as a function of the ordering for two values of the stacking fault energy, taking into account isotropic elastic theory together with nearest-neighbour interactions. The results indicated that these separations were strongly dependent upon the order parameter for the Zn sub-lattice and much less dependent upon the Cu and Ni sub-order parameter. In the case of complete order and with a stacking fault energy of 20mJ/m2 a symmetrical superlattice dislocation of pure edge-type had a calculated separation of 157Å, which was in reasonable agreement with a measured value of 140Å.

Superlattice Dislocations in Cu2NiZn. W.H.M.Alsem, P.M.Bronsveld, E.W.Van Royen: Physica Status Solidi A, 1978, 48[2], 497–502