EQUATIONS OF ORDER-DISORDER KINETICS IN ALLOYS WITH BCC AND FCC LATTICES - TETRAHEDRON APPROXIMATION

The kinetic equations describing the order‐disorder in alloys with b. c. c. and f. c. c. lattices are derived taking into account atom correlation. The consideration is based on the master equation using a superposition approximation. It is supposed that atom movements are controlled by a vacancy mechanism. For the first time, the closed kinetic equations describing the kinetics of ordered alloys with b. c. c. and f. c. c. lattices in four‐particle tetrahedron approximation are obtained. As clusters the tetrahedron atom configuration is chosen. For the system in a stationary state the equations obtained give the same results as a variation cluster method. Copyright © 1990 WILEY‐VCH Verlag GmbH & Co. KGaA