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

Abstract

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 1073K 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.