ChemInform Abstract: The Influence of Zirconium on Sm(CoFeCuZr)2.7 Alloys for Permanent Magnets. Part 1. Identification of the Phases by Transmission Electron Microscopy.

Abstract

005ChemInform Abstract In order to understand the evolution of the system in the temp. range 1150-850 rc C, a cast alloy of the composition Sm(Co0.69Fe0.22Cu0.06Zr0.03)7.2 (corresponding to a composition range known to provide good magnetic properties) is exposed o various heat treatments. The aged alloys are investigated by TEM and EDX microanalysis. The specimens treated at 1050 rc C contain a mixture of Sm2Co17 and Sm2Co7 type phases. Annealing at 850 rc C causes the precipitation of an additional phase of the Sm5Co19 type. Treatment similar to that designed for magnet preparation induces a characteristic cellular morphology.