Vol. 7, Issue 1, Part B (2025)

The excess stability function of Al-Sn melts at 973 K is discussed in terms of concentration fluctuations which is determined from the second derivative of Gibbs free energy of mixing. The molecular interaction volume model has been adopted to explain the excess free energy of mixing, free energy of mixing, concentration fluctuations and excess stability function for Al-Sn melts at 973 K. The theoretical data for excess free energy of mixing, free energy of mixing and concentration fluctuations are in well harmony with the correlated experimental data. The experimentally observed asymmetries in excess free energy of mixing as well as free energy of mixing are successfully explained. The theoretical findings confirm the segregating character of Al-Sn melts at 973 K.