Calorimetric Investigations of Liquid Cu-In-Sn Alloys

The partial and integral enthalpies of mixing of liquid Cu-In-Sn alloys were determined at 1073K by a drop calorimetric technique using a Calvet-type microcalorimeter. The three binary interaction parameters and the ternary interaction parameters were optimized based on the Redlich-Kister-Muggiano model. The iso enthalpy curves of the ternary Cu-In-Sn system at 1073K were constructed. The temperature effect on the ternary system was investigated. Our measurements were compared to the calculations based on several extrapolation models and CALPHAD results. [doi:10.2320/matertrans.47.2025

Thermodynamic properties of liquid Au–Cu–Sn alloys determined from electromotive force measurements

► A full thermodynamic description of the liquid ternary Au–Cu–Sn system is reported. ► The electromotive force method with a liquid electrolyte was used to determine the activity of tin in the alloys. ► The partial free energies of tin in this system were calculated from the obtained EMF values. ► The Gibbs–Duhem integration was used to calculate the integral Gibbs free energy and integral enthalpy of the entire system