MICROSTRUCTURAL CHARACTERIZATION OF RARE EARTH-COBALT MAGNETS.

Structural faults and phase transformations in R//2-Co//1//7 magnets are studied using transmission electron microscopy. The magnetization mechanism in a step aged Sm (Co, Fe, Cu, Zr) alloy is determined to be by domain wall pinning in the 1:5 phase of the cellular microstructure. Limitations of the electron metallography technique to study these materials are pointed out.