Four-parameter model for the thermodynamic and microscopic properties of AlCu liquid alloys at 1373 K

Abstract

The four-parameter model has been applied to study the thermodynamic properties like excess free energy of mixing, free energy of mixing, activity coefficients, activity, excess entropy of mixing, entropy of mixing, heat of mixing and microscopic function like concentration fluctuations in the long wavelength limit, SCC(0) of compound forming AlCu liquid alloys at 1373 K. The theoretical data have been compared with the experimental data available in the literature. There is an excellent agreement between the theoretical and experimental data. For the validation of experimental data, the available CALPHAD data have been used to compare the excess free energy of mixing, free energy of mixing, activity of AlCu liquid alloys at 1373 K. For the understanding of the atomic order of liquid alloy, the short-range order parameter has been computed for AlCu liquid alloys at 1373 K. The negative value of short-range order parameter indicates that AlCu liquid alloy at 1373 K is ordering in nature. Again the model parameters are temperature dependent.