Based upon short-range order parameters determined from X-ray diffuse scattering measurements of a Ni–11.2at%Mo single crystal and effective pair potentials deduced by applying the inverse Monte-Carlo method, the configurational energy change caused by the successive slip of a variable number of unit dislocations on the same {111} plane was calculated. A fraction of 97% of the diffuse antiphase boundary energy of 25mJ/m2 had to be provided by the first slip step. The glide of subsequent dislocations on the same glide plane was thus favored, leading to planar slip; as observed using transmission electron microscopy. Monte-Carlo simulations also showed that the diffuse antiphase boundary energy depended more sensitively upon the alloy concentration than upon the temperature at which thermodynamic equilibrium was established.

Configurational Energy Change Caused by Slip in Short-Range Ordered Ni-Mo. P.Schwander, B.Schönfeld, G.Kostorz: Physica Status Solidi B, 1992, 172[1], 73-85