摘要
Ⅰ. INTRODUCTIONThe diagram phase is the important foundation of materials research, and the theoretical description of it is mostly concentrated on the calculation of energy of formation and configurational entropy for alloy. For the latter, the cluster variation method (CVM proposed by Kikuchi in the 1950’s) provides a good approximation model and paves a new way for the theoretical study of phase diagram for alloy. However, most of the