On the basis of the Wilson equation,an extended Miedema model and the hard sphere theory of self diffusion,the prediction model of mutual diffusion coefficients for binary liquid alloys was established.

In this thesis,the thermodynamic properties of 105 binary liquid alloys have been predicted by the function ofαwhich is the transform of Gidds-Duhem equation.

Based on the relationship between the Wilson parameters and temperature,the Wilson equation can be extended to estimating activities of components of binary and multicomponent liquid alloys at given temperatures only by using the activities of components of binary liquid alloys measured at some temperatures.

Calculation of ternary alloy surface tension with binary alloy segregation factors;

Simulation of isothermal solidification of ternary alloy with phase-field model;

Fabrication of Al-Cu-Fe & Al- Si-Fe ternary alloy powders by solid-liquid reaction milling;

Gibbs free energies of ternary alloys are calculated from the thermodynamic data of binary alloys by the Toop's method.

Based on Miedema model for calculating the formation heat of binary system and Kohler\'s model,a new model was established for calculating activity coefficients in ternary alloys.

The application of Wilson equation on the thermodynamic properties of components in binary aluminum-based liquid alloys was described.