Abstract
The program SOLGASMIX for minimisation of Gibbs energy has been combined with appropriate sub-routines for describing activity coefficients of all components in a multicomponent mixture to provide a powerful method for calculating phase equilibria in higher-order alloy systems. The activity coefficients are derived from a multicomponent Redlich-Kister polynomial description of the integral excess Gibbs energy and the use of the method is illustrated by calculations of phase equilibria in the system Co-Fe-Mo-Ni for temperatures between 1300 K and 1500 K.
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