Thermodynamic assessment of the U–Mo–Al system

Thermodynamic assessment of the U–Mo–Al ternary system has been performed by CALPHAD method. Firstly, the U–Mo binary system has been thermodynamically optimized. The reported five solution phases, liquid, orthorhombic_A20 (αU), tetragonal_U (βU), BCC_A2 (γU) and terminal Mo solid solution are treated as substitutional solution phases. The BCC_A2 takes the same structure as Mo thus they are described with the same model. And the only intermetallic compound, MoU2, is treated as stoichiometric compound. Secondly, by using the available thermodynamic parameters of the Al–U and Al–Mo binary systems reported in literatures, the U–Mo–Al ternary system was thermodynamically assessed. A set of self-consistent thermodynamic parameters has been obtained, which can satisfactorily reproduce most of the thermodynamic and phase diagram data.