Nd-Fe-B rare earth permanent magnet material

摘要

A rare earth permanent magnet material is based on an R-Fe-Co-B-Al-Cu system wherein R is at least one element selected from Nd, Pr, Dy, Tb, and Ho, 15 to 33% by weight of Nd being contained. At least two compounds selected from M-B, M-B-Cu and M-C compounds (wherein M is Ti, Zr or Hf) and an R oxide have precipitated within the alloy structure as grains having an average grain size of up to 5 µm which are uniformly distributed in the alloy structure at intervals of up to 50 µm.