The reduction-diffusion process was developed for the production of rare earth - transition metal intermetallics for magnetic purposes. The process consists in the formation o the intermetallic through the diffusion of the rare earth formed by the reduction of its oxide with metallic calcium and the transition metal. Although originally envisioned for the production of samarium - cobalt intermetallics, the process was successfully adapted for the production of samarium-iron neodymium - iron - boron and lanthanum - nickel intermetallics. The process itself is a variant of a process designed for the production of complex steels and other alloys developed in the twenties. This paper describes the work on the process for the production of samarium - cobalt intermetallics, the preliminary study on its use for the production of nickel-titanium (NiTi) intermetallics. Despite of the results for the production of samarium cobalt intermetallics were good, the materials obtained in the NiTi trials showed several intermetallics from that system, including the NiTi. With the results obtained, a analysis of the feasibility of the process for the production of intermetallics is presented.