Abstract
The microstructure of ingot Fe-Nd-C-B type magnets has been studied by transmission electron microscopy. It has been found that the hard magnetic Fe 14Nd 2C grains, having mean diameter of ≈ 10 μm, contain colonies of 20 nm diameter precipitates. The precipitates do not prove to act as centres for magnetic domain wall pinning. Elastic strain produced by solidification of the Nd-rich phase after heat treatment is considered to be a source of the structural defects observed in the hard magnetic grains. The dislocation systems in the material may affect the deformation mechanism leading to the processing of anisotropic magnets.
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