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Magnetic Properties and Microstructures of Spark Plasma Sintered Sm-Co-Fe-Cu-Zr-Hf Magnets Under Various Heat Treatment Conditions

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Abstract

A spark plasma sintering technique was applied to fabricate full dense and fine-grain Sm24.6Co50Fe17.4Cu5.7Zr1.3Hf1.0 magnetic alloys. The microstructure, phase constituents, and magnetic performance were systematically studied by applying various treatment conditions. It is observed that the single 1:7H phase exists in the solution-treated magnet and then decomposes into the 1:5H phase and 2:17R phase during the isothermal aging treatment and slow cooling treatment. The remanence (Jr) of 0.55 T, intrinsic coercivity (Hcj) of 870 kA/m, and maximum magnetic energy product ((BH)max) of 45 kJ/m3 are obtained for the final state magnet prepared with optimal conditions. The investigated alloys showed excellent thermal stability in the temperature range of 300 to 673 K. As the heat treatment progressed, the distribution of Cu element tends to be more uniform. Completed cellular structure and lamellar phase are observed in the magnets. The current research work might be a potential reference for further research and development work on Sm2Co17-based permanent magnets by the short process.

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References

  1. Liu, J.F., Zhang, Y., Dimitrov, D., Hadjipanayis, G.C.: Microstructure and high temperature magnetic properties of Sm(Co,Cu,Fe,Zr)z (z = 6.7–9.1) permanent magnets. J. Appl. Phys. 85, 2800–2804 (1999)

    Article  ADS  Google Scholar 

  2. Gutfleisch, O., Müller, K.H., Khlopkov, K., Wolf, M., Yan, A., Schäfer, R., Gemming, T., Schultz, L.: Evolution of magnetic domain structures and coercivity in high-performance SmCo 2:17-type permanent magnets. Acta Mater. 54, 997–1008 (2006)

    Article  ADS  Google Scholar 

  3. Yu N.J., Zhu, M.G., Fang, Y.K., Song, L.W., Sun, W., Song, K.K., Wang, Q., Li, Q.: The microstructure and magnetic characteristics of Sm(CobalFe0.1Cu0.09Zr0.03)7.24 high temperature permanent magnets. Scr. Mater. 132, 44–48 (2017)

  4. Strnat, K.J., Strnat, R.M.W.: Rare earth-cobalt permanent magnets. J. Magn. Magn. Mater. 100, 38–56 (1991)

    Article  ADS  Google Scholar 

  5. Mishra, R.K., Thomas, G., Yoneyama, T., Fukuno, A., Ojima, T.: Microstructure and properties of step aged rare earth alloy magnets. J. Appl. Phys. 52, 2517–2519 (1981)

    Article  ADS  Google Scholar 

  6. Guo, Z.H., Pan, W., Li, W.: Sm(Co, Fe, Cu, Zr) z sintered magnets with a maximum operating temperature of 500°C. J. Magn. Magn. Mater. 303, e396–e401 (2006)

    Article  ADS  Google Scholar 

  7. Sepehri-Amin, H., Thielsch, J., Fischbacher, J., Ohkubo, T., Schrefl T., Gutfleisch, O., Hono, K.: Correlation of microchemistry of cell boundary phase and interface structure to the coercivity of Sm(Co0.784Fe0.100Cu0.088Zr0.028)7.19 sintered magnets, Acta Mater. 126, 1–10 (2017)

  8. Chen, H., Wang, Y., Yao, Y., Qu, J., Yun, F., Li, Y., Ringer, S.P., Yue, M., Zheng, R.: Attractive-domain-wall-pinning controlled Sm-Co magnets overcome the coercivity-remanence trade-off. Acta Mater. 164, 196–206 (2019)

    Article  ADS  Google Scholar 

  9. Li, T.Y., Liu, Z., Feng, Y.P., Liu, L., Zhang, C.Y., Yan, G.H., Feng, Z.X., Lee, D., Yan, A.R.: Effect of Zr on magnetic properties and electrical resistivity of Sm(CobalFe0.09Cu0.09Zrx)7.68 magnets. J. Alloys Compd. 753, 162–166 (2018)

  10. Wang, Y., Yue, M., Wu, D., Zhang, D., Liu, W., Zhang, H., Du, Y.: Effect of Cu redistribution in grain boundary on magnetic properties of Sm(Co0.665Fe0.25Cu0.06Zr0.025)7 permanent magnets, J. Alloys Compd. 741, 495–500 (2018)

  11. Yan, G., Liu, Z., Xia, W., Zhang, C., Wang, G., Chen, R., Lee, D., Liu, J.P., Yan, A.: Grain boundary modification induced magnetization reversal process and giant coercivity enhancement in 2:17 type SmCo magnets. J. Alloys Compd. 785, 429–435 (2019)

    Article  Google Scholar 

  12. Shang, Z.F., Zhang, D.T., Xie, Z.H., Wang, Y.Q., Haseeb, M., Qiao, P.B., Liu, W.Q., Yue, M.: Effects of copper and zirconium contents on microstructure and magnetic properties of Sm(Co, Fe, Cu, Zr)z magnets with high iron content. J. Rare Earth. 39, 160–166 (2021)

    Article  Google Scholar 

  13. Song, K.K., Sun, W., Fang, Y.K., Wang, S., Yu, N.J., Zhang, M.J., Zhu, M.G., Li, W.: Optimization of microstructures and magnetic properties of Sm(CobalFe0.227Cu0.07Zr0.023)7.6 magnets by sintering treatment. J. Rare Earth. 37, 171–177 (2019)

  14. Popov, A.G., Golovnia, A.O., Protasov, A.B., Gaviko, V.S., Kolodkin, D.A., Gopalan, T.: Coercivity kinetics upon step annealing of sintered Sm(Co0.88-xFexCu0.09Zr0.03)7 magnets. J. Rare Earth. 37, 1059–1065 (2019)

  15. Horiuchi, Y., Hagiwara, M., Okamoto, K., Kobayashi, T., Endo, M., Kobayashi, T., Nakamura, T., Sakurada, S.: Effects of solution treated temperature on the structural and magnetic properties of iron-rich Sm(CoFeCuZr)Z sintered magnet. IEEE Trans. Magn. 49, 3221–3224 (2013)

    Article  ADS  Google Scholar 

  16. Song, K.K., Fang, Y.K., Wang, S., Yu, N.J., Chen, H.S., Zhang, M.L., Zhu, M.G., Li, W.: Crystalline and magnetic microstructures of iron-rich Sm(Co0.65Fe0.26Cu0.07Zr0.02)7.8 sintered magnets: isothermal aging effect. J. Magn. Magn. Mater. 465, 569–577 (2018)

  17. Song, K.K., Fang, Y.K., Sun, W., Chen, H.S., Yu, N.J., Zhu, M.G., Li, W.: Microstructural analysis during the step-cooling annealing of iron-rich Sm(Co0.65Fe0.26Cu0.07Zr0.02)7.8 anisotropic sintered magnets. IEEE Trans. Magn. 53, 2715372 (2017)

  18. Lu, Q.M., Zhou, C., Yue, M.: Enhanced magnetic properties and thermal stability of Nd2Fe14B/SmCo5 composite permanent magnets prepared by spark plasma sintering. IEEE Trans. Magn. 51, 2103704 (2015)

    Article  Google Scholar 

  19. Song, J., Jiang, Q.Z., Rehman, S.U., He, L.K., Li, X., Chen, Y.W., Zhao, C.J., Zhong, Z.C.: Magnetic properties and microstructure of Sm-Co-Fe-Cu-Zr-Hf spark plasma sintered magnets. Phys. B. 605, 412711 (2021)

    Article  Google Scholar 

  20. Jiang, Q.Z., Zhong, M.L., Quan, Q.C., Zhang, J.S., Zhong, Z.C.: Striking effect of Hf addition on magnetic properties and thermal stability of Nd13Fe81-xB6Hfx (x = 0- 1.0) alloys. J. Alloys Compd. 688, 363–367 (2016)

  21. Jiang, Q.Z., Zhong, M.L., Quan, Q.C., Lei, W.K., Zeng, Q.W., Hu, Y.F., Xu, Y.P., Hu, X.J., Zhang, L.L., Liu, R.H., Ma, S.C., Zhong, Z.C.: Magnetic properties and microstructure of melt-spun Ce17Fe78-xB6Hfx (x = 0–1.0) alloys. J. Magn. Magn Mater. 444, 344–348 (2017)

  22. Xu, C., Wang, H., Liu, B.J., Xu, H., Zhang, T.L., Liu, J.H., Jiang, C.B.: Correlation between ordered solid solution and cellular structure of Sm2Co17 type magnets with high iron content. J. Magn. Magn. Mater. 519, 167477 (2021)

    Article  Google Scholar 

  23. Musa, M., Zhou, X.L., Song, X., Yuan, T., Ma, T.Y.: Fe content influence on the microstructure of solution-treated Sm-Co-Fe-Cu-Zr alloys. Intermetallics 129, 107049 (2021)

    Article  Google Scholar 

  24. Zhang, Z.X., Song, X.Y., Xu, W.W.: Phase evolution and its effects on the magnetic performance of nanocrystalline SmCo7 alloy. Acta Mater. 59, 1808–1817 (2011)

    Article  ADS  Google Scholar 

  25. Yu, N.J., Zhu, M.G., Song, L.W., Fang, Y.K., Song, K.K., Wang, Q., Li, W.: Coercivity temperature dependence of Sm2Co17 -type sintered magnets with different cell and cell boundary microchemistry. J. Magn. Magn. Mater. 452, 272–277 (2018)

    Article  ADS  Google Scholar 

  26. Liu, L., Pan, D.L., Liu, Z., Zhang, H.W., Li, M., Chen, R.J., Liu, X.M., Yan, A.R., Lee, D., Li, W.: Optimization of magnetic properties of sintered (SmGdDy)(Co,Fe,Cu,Zr)z magnets by Dy-Co addition. J. Magn. Magn. Mater. 374, 634–638 (2015)

  27. Wang, Y.Q., Yue, M., Wu, D., Zhang, D.T., Zhang, H.G.: Microstructure modification induced giant coercivity enhancement in Sm(CoFeCuZr)z permanent magnets. Scr. Mater. 146, 231–235 (2018)

    Article  Google Scholar 

  28. Xiong, X., Ohkubo, T., Koyama, T., Ohashi, K., Tawara, Y., Hono, K.: The micro-structure of sintered Sm(Co0.72Fe0.20Cu0.055Zr0.025 )7.5 permanent magnet studied by atom probe. Acta Mater. 52, 737–748 (2004)

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Funding

This work was supported by the Young Talents Program of Jiangxi Provincial Major Discipline Academic and Technical Leaders Training Program (Grant No. 20212BCJ23008), Jiangxi Provincial Natural Science Foundation (Grant No. 20212BAB214018), Young Elite Scientists Sponsorship Program by CAST (No. YESS20200250), National College Students Innovation and Entrepreneurship Training Program (No. 202110407013), and the Program of Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology (No. JXUSTQJYX2020003).

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Author notes

  1. Huixia Li and Junlin Yan contributed equally to this work.

Authors and Affiliations

  1. Jiangxi Key Laboratory for Rare Earth Magnetic Materials and Devices & College of Rare Earths, Jiangxi University of Science and Technology, Ganzhou, 341000, People’s Republic of China

    Huixia Li, Jie Song, Qingzheng Jiang, Sajjad Ur Rehman & Zhenchen Zhong

  2. National Rare Earth Function Materials Innovation Center, Ganzhou, 341000, People’s Republic of China

    Qingzheng Jiang & Zhenchen Zhong

  3. Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, 341000, People’s Republic of China

    Junlin Yan

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  1. Huixia Li
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  2. Junlin Yan
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  3. Jie Song
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  4. Qingzheng Jiang
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Correspondence to Qingzheng Jiang or Zhenchen Zhong.

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Li, H., Yan, J., Song, J. et al. Magnetic Properties and Microstructures of Spark Plasma Sintered Sm-Co-Fe-Cu-Zr-Hf Magnets Under Various Heat Treatment Conditions. J Supercond Nov Magn 36, 1365–1371 (2023). https://doi.org/10.1007/s10948-023-06574-9

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