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<p>The nanocrystalline SmCo<sub>5</sub> permanent magnet alloy demonstrates exceptional magnetic properties owing to its distinctive nanoscale microstructure. In this study, leveraging crystallization annealing to regulate the SmCo<sub>5</sub> amorphous alloy microstructure, a systematic temperature-time-controlled strategy was proposed to optimize its nanocrystalline microstructure. The effects of the annealing time and temperature on the crystallization, phase evolution, and magnetic properties of this alloy were systematically studied. Sm(Co<sub>0.9</sub>Cu<sub>0.1</sub>)<sub>5</sub> nanocrystalline alloys were obtained via high-energy ball milling (HEBM) and then annealed at 550–700°C. The amorphous phase initially transformed into metastable Sm(Co,Cu)<sub>7</sub> phase, followed by the gradual transition to the Sm(Co,Cu)<sub>5</sub> main phase and Sm<sub>2</sub>(Co,Cu)<sub>17</sub>-R trace phase. Upon annealing at 550°C for 30&#xa0;min, ~ 15-nm nanocrystals were formed in the alloy, with coercivity (H<sub>c</sub>) = 5.4 kOe and remanence (M<sub>r</sub>) = 28.5&#xa0;emu/g. H<sub>c</sub> gradually increased with increasing annealing temperature, while M<sub>r</sub> increased slightly at 600°C and then gradually decreased. After annealing at 650°C for 4&#xa0;h, the alloy exhibited uniform grains with moderate sizes and clear grain boundaries. Furthermore, H<sub>c</sub> substantially increased to 31.1 kOe and M<sub>r</sub> rose to 35.2&#xa0;emu/g. These results contribute to elucidate the role of the amorphous-to-crystallization mechanism in improving the magnetic properties of SmCo<sub>5</sub>-based or similar alloys.</p>

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Crystallization Behavior and Magnetic Properties of Nanocrystalline Sm(Co0.9Cu0.1)5 Alloy

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • Xu-hao Han,
  • Cheng-han Fang,
  • Hao-jie Wang,
  • Xing-cheng Yao,
  • Qian-qian Jin

摘要

The nanocrystalline SmCo5 permanent magnet alloy demonstrates exceptional magnetic properties owing to its distinctive nanoscale microstructure. In this study, leveraging crystallization annealing to regulate the SmCo5 amorphous alloy microstructure, a systematic temperature-time-controlled strategy was proposed to optimize its nanocrystalline microstructure. The effects of the annealing time and temperature on the crystallization, phase evolution, and magnetic properties of this alloy were systematically studied. Sm(Co0.9Cu0.1)5 nanocrystalline alloys were obtained via high-energy ball milling (HEBM) and then annealed at 550–700°C. The amorphous phase initially transformed into metastable Sm(Co,Cu)7 phase, followed by the gradual transition to the Sm(Co,Cu)5 main phase and Sm2(Co,Cu)17-R trace phase. Upon annealing at 550°C for 30 min, ~ 15-nm nanocrystals were formed in the alloy, with coercivity (Hc) = 5.4 kOe and remanence (Mr) = 28.5 emu/g. Hc gradually increased with increasing annealing temperature, while Mr increased slightly at 600°C and then gradually decreased. After annealing at 650°C for 4 h, the alloy exhibited uniform grains with moderate sizes and clear grain boundaries. Furthermore, Hc substantially increased to 31.1 kOe and Mr rose to 35.2 emu/g. These results contribute to elucidate the role of the amorphous-to-crystallization mechanism in improving the magnetic properties of SmCo5-based or similar alloys.