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We investigated the post-sinter annealing process in Sm8Fe77Ti5V8Al2 (Cu-free) and Sm8Fe76.5Ti5V8Al2Cu0.5 (Cu-doped) magnets to explore the possibility of achieving high coercivity in the SmFe12-based sintered magnets. We found that optimal annealing of the Cu-doped magnet resulted in a significant increase in coercivity from 0.9 T to 1.5 T, the highest coercivity ever reported for a SmFe12-based magnet. This represents a 67 % improvement, compared to a 13 % increase in the Cu-free system. Combined with a larger remanence due to the minimization of the Fe2Ti phase, a good combination of extrinsic magnetic properties, a remanence of 0.71 T, a coercivity of 1.5 T and the maximum energy product of 84 kJ/m3 were obtained. The optimum post-sinter annealing temperature was found to be 1100 °C, where a continuous Sm-rich intergranular phase is formed due to the phase equilibrium with the ThMn12-type Sm(Fe,V,Ti)12 phase. The underlying mechanisms for the coercivity enhancement revealed by this work provide insights for the development of high-performance SmFe12-based magnets for practical applications.

権利情報:

• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

キーワード: Permanent magnet, SmFe12

刊行年月日: 2025-05-20

出版者: Elsevier BV

掲載誌:

• Acta Materialia (ISSN: 13596454) vol. 294 121160

研究助成金:

• Government of Japan Ministry of Education Culture Sports Science and Technology JPMXP1122715503
• Research and Development JPMXP1122715503
• JST ERATO JPMJER2201
• Japan Society for the Promotion of Science JP23H01674
• Japan Society for the Promotion of Science JP23K26368

原稿種別: 査読前原稿 (Author's original)

MDR DOI: https://doi.org/10.48505/nims.6125

公開URL: https://doi.org/10.1016/j.actamat.2025.121160

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更新時刻: 2026-01-14 15:17:32 +0900

MDRでの公開時刻: 2026-01-14 16:22:14 +0900