Abstract

A statistical theory of the order-disorder transformations for ternary alloys of arbitrary composition and crystal structure is given. Long-range and short-range order parameters are defined, and equations connecting these parameters are given. The general formula for configurational free energy is deduced and the method of calculation of the order-disorder transition temperature is shown. As examples the Heusler alloys Cu 2MnAl and Cu 2(MnAl) and the alloys AgMgSn are considered.

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