Role of terbium hydride additions in the formation of microstructure and magnetic properties of sintered Nd-Pr-Dy-Fe-B magnets
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Peculiarities of the formation of the high-coercivity state of sintered magnets prepared from a rare-earth-metal-depleted Nd-Pr-Dy-Fe-B composition alloyed with terbium hydride were studied. Terbium hydride additions were shown to increase substantially the magnetization coercive force and to decrease slightly the residual inductance. An inhomogeneous distribution of Nd(Pr) and Tb(Dy) within hard-magnetic Nd2Fe14B phase grains was found; the size of regions of inhomogeneity was 30–150 nm.
Keywordscoercive force microstructure of permanent magnets Nd2Fe14B terbium hydride
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