Theory of the existence of a two-phase region in ternary ordered fcc alloys

The limiting temperatures of the two-phase region in ternary ordered fcc alloys of the quasibinary B₃A-B₃D system are found on the basis of equality of the chemical potentials of the components of the ordered and disordered phases (in the Gorskii-Bragg-William approximation). The effect of the relative magnitudes of the three ordering energies on the nature of the phase diagrams of the ternary ordered alloy is analyzed.Translated from Izvestiya VUZ. Fizika, No. 7, pp. 54–60, July, 1970.