Thermodynamic calculation of phase-equilibria in the Al-Ge-Zn system

Phase equilibria in the ternary system Al-Ge-Zn were-calculated at 873, 773 and 658 K from thermodynamic data of the constituent binary systems. Quasi-regular solution and shortest distance path equations were employed to estimate the thermodynamic data of liquid Al-Ge-Zn alloys from the binary data. The thermodynamic behaviour of solid alloys was also approximated by a quasi-regular solution model. The interaction parameter for solid Al-Ge alloys was deduced from the binary phase diagram. The calculated isothermal phase diagrams are in reasonable agreement with the experimental data. Tie-lines delineating equilibria between the liquid and solid alloys were generated.