| 摘要 |
PCT No. PCT/JP88/00225 Sec. 371 Date Oct. 31, 1988 Sec. 102(e) Date Oct. 31, 1988 PCT Filed Mar. 1, 1988 PCT Pub. No. WO88/06797 PCT Pub. Date Sep. 7, 1988.A rare earth-iron permanent magnet which is formed from an ingot of an alloy composed of at least one rare earth element represented by R, Fe, B and Cu, by the hot working at 500 DEG C. or above which refines the crystal grains and make them magnetically anisotropic. A process for producing a rare earth-iron permanent magnet by subjecting the ingot of said alloy to hot working at 500 DEG C. or above. The permanent magnet is equal or superior in magnetic performance to conventional permanent magnets produced by sintering method. The process is simple and able to provides permanent magnets of low price and high performance. In addition, an isotropic rare earth-iron permanent magnet is obtained if said ingot undergoes heat treatment at 250 DEG C. or above.
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