The AB− AC quasi-binary section of the order-disorder phase diagram

Abstract

The AB− AC sections of the order-disorder phase diagram of a ternary alloy ordered with the L1 o binary superstructure are calculated according to the Kikuchi method in an approximation which enables four-body correlations in the atomic arrangement on the tetrahedron sites to be taken into account. The formation conditions of some ternary superstructures are considered. The change of the character of the order-disorder diagram versus the value and sign of the energy parameters, which reflect the ability of different component atomic pairs to order in the first coordination sphere, is discussed.