R-T-B TYPE ALLOY AND PRODUCTION METHOD THEREOF, FINE POWDER FOR R-T-B TYPE RARE EARTH PERMANENT MAG

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Disclosed is an R-T-B alloy which can be a raw material for a rare earth permanent magnet having excellent magnetic characteristics. Specifically disclosed is an R-T-B alloy containing at least Dy (wherein R represents at least one of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Ho, Er, Tm, Yb and Lu; T represents a transition metal containing not less than 80%% by mass of Fe; and B represents a compound containing not less than 50%% by mass of B and not less than 0%% by mass but less than 50%% by mass of at least one of C and N). This R-T-B alloy has a main phase such as an R2T14B phase for exhibiting magnetism, an R-rich phase wherein R is concentrated when compared with the composition ratio of the alloy as a whole, and a Dy concentrated region formed near the R-rich phase in which region Dy is concentrated when compared with the composition ratio of the alloy as a whole.© KIPO & WIPO 2009