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Effect of Cu additions on the magnetic properties and microstructure of FeCoNbB nanocrystalline alloy

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Abstract

The influence of Cu content and the annealing conditions in the (Fe0.5Co0.5)85−x Nb7B8Cu x (x=0.5, 1.0, 1.5) soft magnetic alloys on the magnetic properties and microstructure were investigated. The additions of Cu lower the primary and secondary crystallization temperatures and the α→γ phase transformation temperature of the FeCoNbB alloys. The (Fe0.5Co0.5)84Nb7B8Cu1 alloy annealed at 873 K for 3.6 ks, in which α-(Fe, Co) nanocrystalline phase with diameter of 5 nm precipitated from the amorphous matrix, shows the best soft magnetic properties. The resulting (Fe0.5Co0.5)84Nb7B8Cu1 nanocrystalline alloy exhibits a high saturation flux density of 1.88 T, low coercivity of 42 A/m, very high Curie temperature of 1240 K, as well as low core loss of 770 W/kg at 10 kHz under maximum magnetization of 1 T.

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Acknowledgements

This work was supported in part by the National 863 Project under Grant 2009AA03Z214, in part by the National Science Fund for Distinguished Young Scholars under Grant 50825103, in part by the National Natural Science Foundation of China under Grant 51001112, and in part by the “Hundred of Talents Program” by the Chinese Academy of Sciences under Grant KGCX-2-YW-803.

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Authors and Affiliations

  1. Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, 315201, China

    F. L. Kong, H. Men, M. X. Zhang, T. C. Liu & B. L. Shen

  2. Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai, 980-8577, Japan

    G. Q. **e

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  1. F. L. Kong
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  2. H. Men
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  3. M. X. Zhang
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  4. T. C. Liu
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  6. B. L. Shen
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Correspondence to B. L. Shen.

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Kong, F.L., Men, H., Zhang, M.X. et al. Effect of Cu additions on the magnetic properties and microstructure of FeCoNbB nanocrystalline alloy. Appl. Phys. A 108, 211–215 (2012). https://doi.org/10.1007/s00339-012-6876-8

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  • DOI: https://doi.org/10.1007/s00339-012-6876-8

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