Thermodynamic calculation of phase equilibria in the Be-Ti-V ternary system

Phase equilibria in the Be-Ti-V ternary system have been calculated using a thermodynamic description of the constituent binary systems. Energetic values obtained from first-principles calculations were utilized in our thermodynamic analysis to compensate for the lack of experimental data on the Be-V system. The thermodynamic treatment of the Be-Ti and Ti-V systems was based on previous assessments, and no additional ternary thermodynamic parameter was introduced. Our calculations show that a metastable two-phase separation of the bcc phase is present in the V-rich region of the Be-V binary system, and that this two-phase separation is stabilized in the Be-Ti-V ternary system. Furthermore, the metastable Be-Ti based binary B2 phase was also stable in the ternary system, and it participates in the phase equilibria over a wide composition range.