Calculation of the Ag-Sn-Pb System

Previous thermodynamic assessments of Ag-Pb, Ag-Sn and Pb-Sn were combined to study the Ag-Pb-Sn system. These assessments used different phase stabilities for the pure elements. To derive a unique set of unary phase the excess functions of the assessments were combined with the lattice stabilities after SGTE and the systems recalculated. By combining the binary subsystems an extrapolated ternary system was calculated. Using the values of liquidus temperatures and emf of Sn, completed by ternary excess terms, the thermodynamic description was done, and the phase diagram was recalculated. The results were presented as plots of isotherms and isopleths.