Thermodynamic description of the Cu-Ag-Zr system

Based on the CALPHAD method, the Ag-Zr and Ag-Cu systems have been assessed thermodynamically. The excess Gibbs energy of the solution phases in the Cu-Ag-Zr system was modeled assuming random mixing of components. The ternary phase was defined as a stoichiometric compound due to the lack of efficient thermodynamic data. At first, parameters capable of describing all phases in the Ag-Zr and the Ag-Cu systems were assessed. Combined with the parameters of the Cu-Zr system assessed previously, the isothermal sections of the Cu-Ag-Zr system at 1023 K and 978 K were extrapolated, which can reproduce the measured phase-relations.