The isothermal section of the Ti–Co–Zr ternary system at 773 K

The phase equilibria of the Ti–Co–Zr ternary system at 773 K have been investigated mainly by powder X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive analysis (EDX). The isothermal section consists of 16 single-phase regions, 31 two-phase regions and 16 three-phase regions. There are 11 binary compounds, i.e. CoZr3, CoZr2, CoZr, Co2Zr, Co23Zr6, Co11Zr2, TiCo3, h-TiCo2, c-TiCo2, TiCo, Ti2Co in the system. The existence of two ternary compounds Co10Ti7Zr3 and Co66Ti17Zr17 has been confirmed at 773 K. Co2Zr, CoZr3 and TiCo have a range of homogeneity. The solubilities of Ti in CoZr was determined to be up to 8.1 at.% Ti.