INTERMETALLIDE PRFE2 IN THE PR-FE SYSTEM

The phase composition of Pr-53 at. % Fe alloy after crystallization fr om melt and Pr-77 at. % Fe alloy after phase transition in the solid s tate with stepwise annealing (500 hr at 600 degrees C + 30 hr at 800 d egrees C + 1 hr at 1000 degrees C) is investigated by X-ray and electr on diffraction methods. On crystallization from melt, the intermetalli de PrFe2 (C14, MgZn2 type) is formed; phase transition in the solid st ate, by contrast, yields the intermediate metastable compound PrFe5 wi th a structure of LuMn5 type, which is a derivative of the C14 Laves s tructure.