Thermodynamic Evaluation of the Mg-Ni-Y Ternary System

Thermodynamic modeling of the Mg-Ni-Y system is carried out as a part of multicomponent thermodynamic database for Mg alloys. This system is being modeled for the first time using the modified quasichemical model which considers the presence of short range ordering in the liquid. A self-consistent thermodynamic database for this system is constructed by combining the thermodynamic descriptions of the constituent binaries. Mg-Ni and Ni-Y binary systems have been re-optimized based on the experimental phase equilibrium and thermodynamic data available in the literature. The optimized thermodynamic parameters for the Mg-Y system are taken from the previous thermodynamic assessment of the Mg-Cu-Y system by the same authors. The constructed database is used to calculate and predict thermodynamic properties, the binary phase diagrams and isothermal section of the ternary Mg-Ni-Y system. The calculated results are found to be in good agreement with the experimental data