W-R-a Fe d B-a Cu-based sintered magnet and rapidly cooled alloy

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The present invention discloses a W-containing R-Fe-B-Cu serial sintered magnet and quenching alloy. The sintered magnet contains an R 2 Fe 14 B-type main phase, the R being at least one rare earth element comprising Nd or Pr; the crystal grain boundary of the rare earth magnet contains a W-rich area above 0.004 at% and below 0.26 at%, and the W-rich area accounts for 5.0 vol%ˆ¼11.0 vol% of the sintered magnet. The sintered magnet uses a minor amount of W pinning crystal to segregate the migration of the pinned grain boundary in the crystal grain boundary to effectively prevent abnormal grain growth and obtain significant improvement. The crystal grain boundary of the quenching alloy contains a W-rich area above 0.004 at% and below 0.26 at%, and the W-rich area accounts for at least 50 vol% of the crystal grain boundary.