R-T-B ALLOY, PROCESS FOR PRODUCTION OF R-T-B ALLOY, FINE POWDER FOR R-T-B RARE EARTH PERMANENT MAG

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An R-T-B alloy for rare earth permanent magnets (wherein R is a rare earth component which consists of at least one of rare earth elements (including Y) and which contains Dy and/or Tb as the essential element; T is a metal component which contains Fe as the essential component; and B is boron), characterized in that the alloy has both a main phase consisting of R2T14B and an R-rich phase and that when the average of the concentrations of Dy and/or Tb in the whole R-T-B alloy is referred to as average concentration, the main phase contains Dy and/or Tb in a concentration equal to or higher than the above average concentration in a region accounting for at least 60% of the area of the main phase in an arbitrary section of the alloy; a process for the production of the R-T-B alloy; a fine powder for R-T-B rare earth permanent magnets which is prepared from the R-T-B alloy; R-T-B rare earth permanent magnets; and motors.