Thermodynamic Assessment of the U-Sn System and Extension to the U-Zr-Sn System

Based on the experimental data of phase diagram and thermodynamic properties, the U-Sn system was assessed using the CALculation of PHAse Diagrams (CALPHAD) method. The Redlich-Kister model was used for the description of the liquid phase. A set of self-consistent thermodynamic parameters describing all condensed phases was obtained. The calculated results in this work are in good agreement with available phase equilibria data and thermodynamic data. The tentative U-Zr-Sn ternary system was constructed by extrapolation method and the available ternary experimental data from literature can be reasonably reproduced using the current thermodynamic description.