Thermodynamic analysis of the Ga-Ti system

A thermodynamic assessment of the binary Ga-Ti system was performed based on the evaluation of the literature and our experimental results. Diffusion couple and alloy samples with appropriate compositions were prepared and analyzed by electron probe microanalysis and X-ray diffraction to determine the stability of intermetallic compounds. The Ga-rich part of phase diagram was checked by differential thermal analyses. The subreguler solution model was used to describe the solution phases liquid (L), b.c.c. (β), h.c.p. (α₁) and f.c.c. (γ₁). The compound energy model was employed to describe compounds with homogeneity ranges of Ti ₃Ga (α₂), Ti₅Ga₄(ρ) and TiGa(γ₂). The compounds Ti₂Ga, Ti₅Ga ₃, Ti₂Ga₃, TiGa₂ and TiGa ₃ were treated as stoichiometric phases. A set of thermodynamic parameters was obtained and the calculated phase diagram was presented.