Prediction of some thermodynamic properties of two- and three-component melts from phase diagrams

Methods permitting the calculation of the thermodynamic properties of liqui d alloys with satisfactory accuracy on the basis of the liquidus coordinate s of the corresponding phase diagram, the heats of fusion of the components , and in some eases the thermodynamic properties of the solid and liquid ph ases have been developed. The potential of the improved Hauffe-Wagner metho d are noted; it may be used to calculate the activities of the components i n liquid alloys. The activities of the components of the binary systems (Si , Ge, Al, Ni) -Me and Fe-Nb are calculated for the first time over a broad composition range. The activities of silicon in liquid three-component Cu - Si - Al alloys are calculated from the phase diagram. The results are in g ood agreement with those obtained from the Boniet equation on the basis of the activities of silicon in the binary boundary systems Cu-Si and Al-Si.