| 摘要 |
PURPOSE:To obtain an anisotropic magnet showing high magnetic properties, by subjecting an Mn-Al-C magnetic alloy to compression working so that compressive strain is lower in the outside peripheral part than in the inside peripheral part and by forming the inside peripheral surface of a billet into recessed and projecting shape by means of further compression working. CONSTITUTION:A hollow billet 1 composed of Mn-Al-C magnetic alloy is set up so that its inside peripheral surface is in contact with the surface of a punch 2 of recessed and projecting shape while its outside peripheral surface is in contact with the inside peripheral surface of a die 4. The billet 1 is subjected to compression working at 530-830 deg.C by the use of the punch 2 so that compressive strain in the outside peripheral part is lower than that in the inside peripheral part and, by further compression working, the inside peripheral surface of the billet 1 is formed into recessed and projecting shape.
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