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Thermodynamic optimization of the Ni–Al–Pr ternary system

A thermodynamic optimization of the Ni–Al–Pr ternary system that includes eight ternary phases was conducted. The Al–Pr binary system was re-optimized thermodynamically with a consideration for the Pr solubility in fcc(Al). The enthalpy of formation of eight ternary intermetallic compounds was calculated by using Miedema theory. A self-consistent set of thermodynamic parameters for the Al–Pr binary and Ni–Al–Pr ternary systems was optimized by using the calculation of phase diagram (CALPHAD) method. The calculated results for the binary and ternary systems showed satisfactory agreement with the experimental literature data. This work is meaningful in the design of NiAl alloys.