Calculation of alloy phase diagrams by continuous cluster variation method

The continuous displacement (CD) formulation of the cluster variation method (CVM) is applied to study the phase stability of the binary alloys. The present theory is a generalization of the conventional CVM and the basic idea is to treat an atom which is displaced by r from its reference lattice point as a species designated by r. The applications are presented to two-dimensional as well as three-dimensional binary alloys. For phase-separating binary alloys, the change of lattice constant with the composition and the reduction of the transition temperature are shown. We also investigate the order-disorder phase transition of BCC alloys within the pair approximation of the CD scheme of the CVM, (C) 1999 Published by Elsevier Science B.V. All rights reserved.