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GUO Ai-hong, WANG Yue, JIN Jian-xin. Effect of the First Tempering on Microstructure and Properties of Sintered Nd-Fe-B Magnets[J]. Development and Application of Materials, 2005, 20(6): 24-26. DOI: 10.19515/j.cnki.1003-1545.2005.06.007
Citation: GUO Ai-hong, WANG Yue, JIN Jian-xin. Effect of the First Tempering on Microstructure and Properties of Sintered Nd-Fe-B Magnets[J]. Development and Application of Materials, 2005, 20(6): 24-26. DOI: 10.19515/j.cnki.1003-1545.2005.06.007
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Effect of the First Tempering on Microstructure and Properties of Sintered Nd-Fe-B Magnets

  • Luoyang Ship Materials Research Institute, Luoyang 471039, China

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  • Received Date: August 08, 2004
  • Available Online: June 14, 2024
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  • The effect of tempering process on the microstructure and magnetic properties of sintered Nd-Fe-B magnets were investigated.It was manifested that when the tempering temperature was below 910℃, the Nd-rich phase on grain boundary gathered and a wide band of the Nd-rich phase formed, the volume fraction of matrix phase was small and so the magnetic properties of the magnets were low.When the temperature was above 930℃, the grain size became coarse, the grain boundary area became smaller, the band of the Nd-rich phase on grain boundary became wider and the magnetic properties of the magnets were deteriorated.When the temperature is between 910℃ and 930℃, the grain size was inclined to be uniform, the content of clustered Nd-rich phase reduced, the magnetic properties of magnets were optimized.So the proper temperature for the first tempering of Nd30Dy3.5Al0.2B1 alloy shall be from 910℃ to 930℃.
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