Phase equilibria in the Fe–Ti–Zr system at 1023 K

Phase relations for Fe–Ti–Zr ternary system at 1023 K have been investigated by means of diffusion triple together with electron probe microanalysis technique, a series of tie-lines and tie-triangles have been determined and the isothermal section at 1023 K has been established, and seven three-phase fields have been figured out. It was found that all of the Fe–Zr and Fe–Ti binary phases show large ternary solubility, and Zr and Ti can substitute for each other to a certain degree. The largest solid solubility of Ti in Fe2Zr and in FeZr3 is about 8.5 at.% Ti and 35.7 at.% Ti, and of Zr in Fe2Ti and FeTi is about 5.6 at.% Zr and 6.3 at.% Zr, respectively. The solubility range of Fe2Ti, FeTi, Fe2Zr and FeZr3 is 64.9–72.7 at.% Fe, 46.6–49.1 at.% Fe, 65.8–71.7 at.% Fe and 20.9–24.3 at.% Fe, respectively. No ternary compound was found.