Thermodynamic modelling of the ternary B–Mo–Ti system with refined B–Mo description

In the present paper, the constituent binary B–Mo system is re-modelled in order to reproduce genuine homogeneity ranges of the molybdenum borides. Based on this, available descriptions of the constituent B–Ti and Mo–Ti systems as well as new experimental data reported in the literature for the ternary B–Mo–Ti system are used to model the B–Mo–Ti system in the entire composition and temperature ranges. The elaborated thermodynamic description is further applied to calculate selected phase equilibria as to provide a comparison between calculated and experimental results. The calculations are shown to reproduce the experimental data reasonably well, however for few alloys belonging to the domain of primary (Ti,Mo)B₂ crystallization the computed solidus temperatures are about 200 K higher than incipient melting temperatures measured by pyrometry. - Highlights: • Thermodynamic refinement of the B–Mo system. • Thermodynamic modelling of the complete B–Mo–Ti system. • Comparison of calculated and experimental results.