Thermodynamic Properties of Binaries (Cu-Ni, Ni-Pt, Cu-Pt) and Ternary (Cu-Ni-Pt) Solid Alloys Predicted Using the Molecular Interaction Volume Model (MIVM)
摘要
The activities of the constituent metals in the binary solid alloys Cu-Ni at 973 K, Ni-Pt at 1625 K, and Cu-Pt at 1350 K, as well as their excess Gibbs energy and the activities of Cu in the ternary solid alloys Cu-Ni-Pt at 1000 K for three cross-sections, i.e., for different ratios of nickel to platinum, XNi:XPt = 2:1, 1:1, and 1:2, have been computed using the statistical thermodynamic model based on the free volume concept, i.e., the molecular interaction volume model (MIVM). The predicted values have been compared with the available experimental data and analyzed for the binary solid solutions. In addition, the excess Gibbs energy of mixing (ΔGXS) of the ternary Cu-Ni-Pt alloys for all three cross-sections has been calculated using the same model. The agreement between the theoretical and experimental results for the binary solid alloys is found to be satisfactory, confirming the suitability of the model in predicting thermodynamic properties and interaction behavior in ternary and multicomponent metallic solid solutions.