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Improvement of magnetic properties, microstructure and magnetic structure of Fe73.5Cu1Nb3Si15.5B7 nanocrystalline alloys by two-step annealing process

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Abstract

Fe73.5Cu1Nb3Si15.5B7 nanocrystalline alloys were prepared by using conventional one-step annealing process and two-step annealing process. It was found that two-step annealing process can effectively improve soft magnetic properties and optimize microstructure. By separately controlling the formation of Cu clusters and further optimize the nanocrystalline structure, Bcc α-Fe with the grain size of 13 nm is formed in samples pretreated at 400 °C and nanocrystallized at 560 °C for 1 h. The samples exhibit excellent magnetic properties, such as lower coercive force of 0.7 A/m, higher initial permeability of 9.16 × 104, lower core loss of 0.18 W/kg at 0.7 T and 400 Hz, and 0.5 W/kg at 0.7 T and 1 kHz, respectively. The microstructure and magnetic structure evolution during different annealing processes were investigated. Correlation among the magnetic properties, magnetic structures and the microstructures changes in two different crystallization processes was studied systematically.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant No. 51201174). Ningbo International Cooperation Projects (2015D10022).

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Authors and Affiliations

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

    Yabin Han, Anding Wang, Aina He, Chuntao Chang & Xinmin Wang

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

    Yabin Han, Anding Wang, Aina He, Chuntao Chang & Xinmin Wang

  3. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China

    Yabin Han & Fushan Li

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  1. Yabin Han
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  2. Anding Wang
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  3. Aina He
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  4. Chuntao Chang
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Correspondence to Anding Wang, Chuntao Chang or Fushan Li.

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Han, Y., Wang, A., He, A. et al. Improvement of magnetic properties, microstructure and magnetic structure of Fe73.5Cu1Nb3Si15.5B7 nanocrystalline alloys by two-step annealing process. J Mater Sci: Mater Electron 27, 3736–3741 (2016). https://doi.org/10.1007/s10854-015-4216-4

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  • DOI: https://doi.org/10.1007/s10854-015-4216-4

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