Experimental investigation of phase equilibria in the Ti-Fe-Cr ternary system

Phase equilibria in ternary Ti-Fe-Cr system at 873 and 1173 K were investigated in this work. Based on the phase constitutions and phase compositions in 32 samples prepared using the equilibrated alloys, the isothermal sections of the Ti-Fe-Cr ternary system were established. For this system, there were six three-phase regions at both 873 and 1173 K, the phase relations at the studied two temperatures are almost the same. Thereinto, two tentative three-phase regions of βCr2Ti + β(Ti) + (Fe, Cr)2Ti and βCr2Ti + β(Ti) + αCr2Ti were deduced near the Ti-Cr side at 1173 K. The (Fe, Cr)2Ti phase has a large solubility of Cr, up to 59.1 at% at 873 K and 59.5 at% at 1173 K. Moreover, at 873 and 1173 K, the homogeneity ranges of the nearly linear ternary compounds τ1 were measured to be 49.9-72.1 at% Fe and 52.7-77.2 at% Fe, respectively, and the solubility of Cr in (Fe, Cr)Ti were 9.0 at% and 10.6 at%.