A thermodynamic assessment of the CuMgNi ternary system

A complete thermodynamic description of the CuMgNi ternary system was carried out based on the CALPHAD method. Ternary solubilities of the binary phases Mg2Cu, Cu2Mg, Mg2Ni and Ni2Mg were considered. The Gibbs energies of these semi-stoichiometric compounds were expressed by the compound-energy formalism. Liquid and solid solution phases were described using the Redlich-Kister-Muggiani formalism. The model parameters were evaluated using ThermoCalc software, utilizing the experimental data available in the literature including experimental thermodynamic functions and previously established portions of the phase diagram, such as isopleths and isotherms. Reasonable agreement was obtained between calculated results and experimental information.