Phase equilibria in the Fe–Rh–Ti system I. Experimental results

Two isothermal sections of the ternary system Fe–Rh–Ti were determined experimentally at 1000 °C and 800 °C using annealed alloys and diffusion couples. No ternary compound was found in this system. The B2 ordered phase is stable in all three binary subsystems of the Fe–Rh–Ti system and forms a range continuous solid solution at both temperatures. At 800 °C the B2-phase exhibits a tetragonal structure at certain ranges of composition. The same structure was observed in the binary Ti–Rh system. Within the B2 phase domain pseudo-interfaces were observed when the diffusion path crosses equiatomic compositions. A large miscibility gap between A2 and B2 was observed in the Fe-rich part of the Fe–Rh–Ti system.