MATERIAL ALLOY FOR RARE EARTH SINTERED MAGNET AND ALLOY POWDER FOR RARE EARTH SINTERED MAGNET

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PROBLEM TO BE SOLVED : To provide a material alloy for a R2Fe14B rare earth magnet excellent in magnetic properties, and an alloy powder thereof. SOLUTION : The material alloy for the rare earth sintered magnet is an alloy having a composition composed of 27.6-33.0 mass% of R including neodymium or including neodymium and at least one element chosen from the group consisting of rare earth metal elements including yttrium but not including neodymium, 0.94-1.30 mass% of boron and the balance M containing iron. The average distance between R-rich phases in the alloy is 3-12 μm; the value obtained by dividing the standard deviation of the R-rich phase distance with the average distance between the R-rich phases is ≤0.25, and the volume percentage of a R2Fe14B main phase is ≥88 vol.%. COPYRIGHT : (C)2009, JPO&INPIT