Abstract
A simple theory of mixtures for symmetric alloys was used to study the thermodynamic and structural properties of the Al-Ga alloy in the liquid state at 1023 K. The computed thermodynamic properties are in a very good agreement with the observed values and show that the alloy is weakly interacting. The computed structural properties show that the Al-Ga alloy is segregating in nature which is in agreement with the observed values. The excess free energy of mixing, activity of monomers and concentration fluctuation in the long wavelength limit was extrapolated to higher temperatures by optimising the temperature dependent parameters. As the temperature increases, the behaviour of the alloy shifts towards the ideality.
Highlights
Understanding the mixing behaviour of the constituents of an alloy in the liquid state is of great importance in developing the desired materials in the solid-state
The mutual and ideal diffusion coefficients can be related to concentration fluctuation in the long wavelength limit as follows:[20,21]
The positive value of A0 indicates that there is a tendency of phase segregation in the Al-Ga alloy in the molten state
Summary
Understanding the mixing behaviour of the constituents of an alloy in the liquid state is of great importance in developing the desired materials in the solid-state. To comprehend the complexities of liquid alloys, a number of models have, been employed by researchers.[1,2,3,4,5,6,7,8,9,10,11,12] In the present work, a simple theory of mixture for symmetric alloy was employed to study the thermodynamic and structural properties of aluminium-gallium (Al-Ga) alloy at 1023 K in the liquid state.[14,15]. In Al-Ga alloy, the electronegativity of Al (= 1.61) and Ga (= 1.81) are comparable to each other and there is less chance of forming ionic bonding between them For this reason, a simple theory of mixture was employed to explain the mixing behaviour of the Al-Ga alloy in the liquid state.
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