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The existing quasi-lattice theory for liquid alloys (QLT), which has beenextensively used by many researchers, has been modified by incorporating theknowledge of composition and temperature-dependent coordination numbers. Themodified QLT was then used to compute the enthalpy of mixing, the entropy ofmixing, concentration fluctuations, Warren-Cowley short range order parameter,surface concentrations and surface tensions of liquid Al-Sn, Al-Zn and Sn-Znsystems, which are the binary sub-systems for Al-Sn-Zn. The effect of theapproximation of coordination number in the existing QLT was also investigatedand was found to be insignificant when coordination number is 10. This work hasprovided a more physically realistic quasi-lattice theory, and has contributedto the knowledge on the binary subsystems of Al-Sn-Zn and has also set afoundation for the application of quasi-lattice theory on Al-Sn-Zn and otherternary systems.

Modification of the quasi-lattice theory for liquid alloys on the basis  of varying the coordination number and its application to Al-Sn, Al-Zn and  Sn-Zn