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 used in a rare earth permanent magnet, where R is at least one element selected from rare earth elements including Y, which contains Dy and/or Tb as an essential element, T is a metal comprising Fe as an essential element, and B is boron, comprising : a main phase being an R2T14B phase, and an R-rich phase; and when a mean value of the concentration of Dy and/or Tb in the whole of said R-T-B alloy is defined as an average concentration, an area of 60% or more of an area of said main phase in an arbitrary cross-section of said R-T-B alloy contains said Dy and/or Tb at the average concentration or higher; 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 magnet, and motors.