Bulk and dynamic properties in Al–Zn and Bi–In liquid alloys using a theoretical model

A formalism that connects thermodynamic and dynamic properties such as viscosity and diffusion coefficient has been used to calculate the concentration dependence of the free energy of mixing, concentration–concentration fluctuations in the long-wavelength limit and the concentration dependence of diffusion as well as viscosity in Al–Zn and Bi–In binary liquid alloys at various temperatures. Our calculations show that a reasonable degree of chemical order exists in Bi–In system, while Al–Zn liquid alloy was observed to exhibit a liquid miscibilty gap or phase separation over the concentration range. It can be concluded that size effect plays a more prominent role in the energetics of Bi–In than it plays in Al–Zn alloy. This fact is substantiated by predicted dynamic properties of both systems.