The Al–B–Nb–Ti system: I. Re-assessment of the constituent binary systems B–Nb and B–Ti on the basis of new experimental data

Aiming to obtain a reliable description of the quaternary Al–B–Nb–Ti system, the thermodynamic descriptions of the constituent binary systems B–Nb and B–Ti are revised by modelling of the Gibbs energies of all individual phases using the CALPHAD approach and recent SGTE descriptions of the Gibbs energies of phases for pure elements. The model parameters have been evaluated taking into account the data on thermodynamic properties and phase equilibria reported in recent publications and obtained by own key measurements. The phase diagrams and the thermodynamic properties calculated with the evaluated parameters are in good agreement with the corresponding experimental data, and the thermodynamic descriptions of the systems become more suitable for high-order systems.