THERMODYNAMIC INVESTIGATIONS OF BINARY-LIQUID AND SOLID CU-MG AND MG-NI ALLOYS AND TERNARY LIQUID CU-MG-NI ALLOYS

Using different calorimeters, the following measurements have been carried out: (i) the determination of the integral enthalpy of mixing of binary liquid Mg-Ni and ternary liquid Cu-Mg-Ni alloys; (ii) the determination of the heat capacity of the intermetallic compounds CuMg2, Cu2Mg, Mg2Ni and MgNi2; (iii) the determination of the enthalpy of fusion of the intermetallic compounds CuMg2 and Cu2Mg. An association model is used to calculate the thermodynamic functions of mixing of liquid Cu-Mg and Mg-Ni alloys and the phase equilibria of the Mg-Ni system. The thermodynamic functions of the liquid Cu-Mg-Ni alloys are calculated using the model parameters of the base binary systems.