Thermodynamic description of Cu-Mg-Ni and Cu-Mg-Zn systems

A thermodynamic description is presented for ternary Cu-Mg-Ni and Cu-Mg-Zn systems. Thermodynamic parameters of binary sub-systems, Cu-Mg, Cu-Ni, Cu-Zn, Mg-Ni and Mg-Zn, are taken from earlier SGTE-based assessments and those of the Cu-Mg-Ni and Cu-Mg-Zn systems are optimized in this study using experimental phase equilibrium and thermodynamic data. Solution phases of the systems are described with the substitutional solution model and intermetallic compounds, treated as simple semi-stoichiometric phases of the (A,B)pCq type, are described with the sublattice model.