Estimated and Measured Excess Functions and Phase Diagram of Ternary Alloys.

Abstract

Excess functions of formation and equilibrium temperatures of ternary alloys have been determined by calorimetric and Potentiometric techniques and differential enthalpic analysis on the whole concentration range. Enthalpies and Gibbs free energies of formation of the binary subsystems have been extrapolated into the ternary system by using empiric relations in which a ternary term has been included. The ternary phase diagrams have been calculated by computer from the ternary Gibbs free energy. Most of the ternary investigated systems exhibit a good agreement between experimental and calculated temperatures. The Al+Bi+Ga and Ag+Au+Ge alloys have been chosen as examples.