NEW PHASES IN FE-ND ALLOYS OBTAINED BY QUENCHING FROM THE LIQUID-STATE

The study of phase formation processes in alloys based on rare-earth a nd transition metals under equilibrium and nonequilibrium conditions i s of interest for the establishment of the regularities involved in ob taining a high-coercivity state in them. In recent years, papers have appeared devoted to the investigation of the magnetic properties and s tructure of alloys in the Fe-Nd system. Data on the phase state of all oys in the Fe-Nd system are mainly contradictory, especially for alloy s obtained under nonequilibrium cooling conditions. In this paper, we present the results of an investigation of the phase composition and m agnetic properties of alloys in the Fe-Nd or Fe-Co-Nd system after que nching from the liquid state and subsequent annealing. In the alloys, we observe ferromagnetic phases having different Curie point temperatu res. We determine the conditions for obtaining a high-coercivity state in the alloys.