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.