FOR rTB RARE EARTH SINTERED MAGNET ALLOY AND METHOD OF MANUFACTURING, AND METHOD OF MANUFACTURING A

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The alloy for R-T-B-based rare earth sintered magnet of the invention is characterized by comprising rare earth element R, transition metals containing Fe as the main component, metal elements M containing at least one element selected from Al, Ga and Cu, and B and inevitable impurities; containing 13 to 16 atom % R, 4.5 to 6.2 atom% B, and 0.1to 2.4 atom% M, and the rest is T; the ratio of Dy in the total rare earth element is 0 to 65 atom%, satisfying following (expression 1), and comprising a main phase containing R2Fe14B and more alloy grain boundary phase containing R compared with the main phase; the interval of the alloy grain boundary phase is from 1[mu]m to 3[mu]m. 0.30<=B/TRE<=0.37 (expression 1).