Investigation of the Integral Enthalpy of Mixing of the Ternary Ag-Al-Sn System with a Calorimetric Method

The integral enthalpy of mixing of the ternary Ag-Al-Sn system was determined at 1173 K using a calorimetric method. For the determination of the temperature dependency, an additional measurement was performed at 973 K. The substitutional solution model of Redlich - Kister - Muggianu was used for a least square fit of the experimental data in order to get an analytical expression for the integral enthalpy of mixing. The ternary extrapolation models of Kohler, Muggianu, and Toop were applied to calculate the integral enthalpy of mixing and to compare measured and extrapolated values. Additionally calculations of the integral enthalpy of mixing using the Chou model have been carried out. With the calculated data, the isoenthalpy lines have been determined using the RedlichKister-Muggianu model.