Phase Equilibria of the Ag-Cu-M (M = Nb, Fe, Pb) Systems

Sixteen alloys were prepared to determine the isothermal sections of the Ag-Cu-Nb system at 500, 600 and 700 degrees C using x-ray diffraction (XRD) and scanning electron microscopy with energy dispersive x-ray spectroscopy (SEM/EDS). Based on the thermodynamic descriptions of constitutive binary systems as well as the experimental phase equilibria data obtained from the present work and literatures, the Ag-Cu-M (M = Nb, Fe, Pb) ternary systems were thermodynamically evaluated by the CALPHAD (CALculation of PHAse Diagrams) method. The solution phases were described by the substitutional solution model and a set of self-consistent thermodynamic parameters was finally obtained for each of the ternary systems. The calculated isothermal sections are in good agreement with most of the reliable experimental data.

Automated summary

The Ag-Cu-M (M = Nb, Fe, Pb) ternary systems were thermodynamically evaluated using experimental data and thermodynamic models. The calculated isothermal sections showed good agreement with experimental data.