RARE-EARTH MAGNET AND PROCESS FOR PRODUCING SAME

摘要

Provided is a rare-earth magnet which contains no heavy rare-earth metals such as Dy and Tb in the grain boundary phase and in which a modifying alloy for heightening the coercive force (in particular, high-temperature coercive force) was infiltrated at a lower temperature than in conventional rare-earth magnets. This rare-earth magnet hence has high coercive force and relatively high magnetizability. Also provided is a process for producing the rare-earth magnet. The rare-earth magnet RM comprises a main phase MP of an RE-Fe-B type nanocrystal structure (RE is Nd and/or Pr) and a grain boundary phase BP of an RE-X alloy (X is a metallic element other than the heavy rare-earth elements) present at the periphery of the main phase MP, wherein each grain of the main phase MP has been oriented along an anisotropy axis and the grains of the main phase, when viewed from a direction perpendicular to the anisotropy axis, have a plane shape which is quadrilateral or is akin thereto.