LAUSR

The thermodynamic description of the ternary system B-Ti-Zr has been obtained by modelling the Gibbs energy of all individual phases using the CALPHAD (CALculation of PHAse Diagrams) approach. There is no ternary compound in this system. The individual solution phases, i.e. Liquid, (βTi, βZr), TiB, (Ti, Zr)B2 and ZrB12 have been modeled. The modeling covers the whole composition and temperature ranges. The Gibbs energy of ZrB2 in the B-Zr system was reassessed using the two-sublattice model (B, Zr)1(B, Zr)2. A set of self-consistent thermodynamic parameters for the B-Ti-Zr system was obtained by considering the phase diagram data in the ternary system. Comprehensive comparisons between the calculated and measured phase diagram and thermodynamic data showed that the experimental information was satisfactorily accounted for by the present thermodynamic description. The liquidus projection and reaction scheme of the B-Ti-Zr system have also been presented.