Configuration of Antiphase Boundaries in Ordered AuCu₃‐Type Solid Solutions

Abstract

Abstract The degree of order and concentrations of the components in the vicinity of the 1/2 〈110〉 {111} antiphase boundary of the L1 2 superstructure are calculated using a nearest neighbours approximation. Relaxation of atomic order, and component concentrations differing significantly from the stoichiometric compounds, are found near the antiphase boundary. The superdislocations under thermodynamic equilibrium are found to be rather strongly pinned. The temperature dependence of the “start” stress of the superdislocations shows a maximum at ≈ 0.8 T k .