Thermodynamic description of the binary Al–V and ternary Al–Cr–V systems

Abstract

In this paper, the thermodynamic descriptions of the binary Al–V and ternary Al–Cr–V systems were updated by using the CALculation of PHAse Diagram (CALPHAD) approach. For the Al–V sub-binary system, in order to unify the models of Al8V5 phase and βAl8Cr5 phase with the same structure, Al8V5 phase was described by a two-sublattice model of (Al,V)8(Al,V)5. The calculated phase equilibria and thermodynamic properties in the binary Al–V system showed better agreement with more experimental information than those in the previous assessment. As for the Al–Cr–V ternary system, the newly updated thermodynamic descriptions of the Al–V system as well as those of the Al–Cr and Cr–V binary systems from the literature were adopted. A set of reliable and self-consistent thermodynamic parameters for the Al–Cr–V ternary system were obtained. Good agreement between the calculated results and the experimental data was achieved.