Enthalpy of mixing of liquid Ag–Bi–Cu alloys at 1073 K

•Partial and integral mixing enthalpies of liquid Ag–Bi–Cu alloys were determined.•Integral mixing enthalpies are small and endothermic, similar to limiting binaries.•The ternary data were fitted on the basis of Redlich–Kister–Muggianu model.

The Ag–Bi–Cu system is among those ternary systems which have not been fully studied yet, in particular the thermodynamic description of the liquid phase is missing. Partial and integral enthalpies of mixing of liquid ternary Ag–Bi–Cu alloys were determined over a broad composition range along six sections: x(Ag)/x(Bi) = 0.25, 1, 4; x(Ag)/x(Cu) = 1.5; x(Bi)/x(Cu) = 1.86, 4. Measurements were carried out at 1073 K using two Calvet type microcalorimeters and drop calorimetric technique. It was found that integral enthalpies of mixing are small and endothermic, similarly to limiting binary alloys. The ternary data were fitted on the basis of an extended Redlich–Kister–Muggianu model for substitutional solutions. There are no significant additional ternary interactions.