| 简介 |
A starting-material alloy for R-T-B type magnets which comprises an R2T14B phase as the main phase and an R-rich phase having an increased concentration of R, wherein the main phase comprises dendrite trunks and secondary dendrite arms that branch off from the dendrite trunks, the volume proportion of the region where the secondary dendrite arms have generated being 2-60%. Thus, excellent coercive force in the R-T-B type sintered magnet can be ensured even when the addition amount of a heavy rare-earth element is reduced. It is preferable that the alloy should have a spacing between grains of the R-rich phase of 3.0 μm or less and a volume proportion of chill crystals of 1% or less. Furthermore, it is preferable that the spacing between the secondary dendrite arms should be 0.5-2.0 μm and the R-rich phase should have an aspect ratio in terms of corresponding ellipse of 0.5 or less. |
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