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Effects of flash annealing and external magnetic field on magnetic properties of relatively high Nd content (37% by weight) NdFeB alloy

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Abstract

Post modifications such as alloying element addition and/or heat treatment are applied to improve the magnetic properties of NdFeB permanent magnets. In this study, effects of external magnetic field and flash annealing at different temperatures (680 °C and 710 °C) and durations of 5 and 10 min on the magnetic properties of relatively high Nd content (37 wt.%) NdFeB magnet alloys were investigated. Melt spinning method was used in production of the NdFeB magnet alloys. Heat treatment was applied to various NdFeB magnet ribbons at 680 °C and 710 °C temperatures for 5 and 10 min by the flash annealing at heating and cooling rates of 300 K/s. In addition, before vibrating sample magnetometer tests, various samples were magnetized under an external magnetic field of 5 Tesla. After melt spinning, semi-amorphous structure was obtained and Nd2Fe14B hard and α-Fe soft magnetic phases were crystallized at nanoscale by flash annealing. These crystallizations formed between approximately 350 °C and 430 °C. After the flash annealing, residual amorphous structures were observed without complete crystallization. The highest remanence and coercivity were obtained in the sample flash annealed for 10 min at 710 °C, 57.64 emu/g and 10,419.07 Oe, respectively. The maximum energy product improved thanks to the high remanence and coercivity, important for the NdFeB magnets resulted in a high value of 87.79 kJ/m3 in the same sample. This flash annealing procedure provides a cost-effective and simple platform to improve the magnetic features of NdFeB magnets.

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Acknowledgements

This study was funded by the Scientific and Technological Research Council of Turkey (TUBITAK) with Project Number of 216M252 and Scientific Research Projects Coordinator of Sivas University of Science and Technology with Project Number of 2020-TDP-Mühe-0001.

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Authors and Affiliations

  1. Department of Fundamental Sciences and Engineering, Sivas University of Science and Technology, Sivas, Turkey

    Muhammed Fatih Kılıçaslan

  2. Department of Aeronautical Engineering, Sivas University of Science and Technology, Sivas, Turkey

    Yasin Yılmaz & Bekir Akgül

  3. Department of Electrical and Electronic Engineering, Istanbul University, Cerrahpaşa, Istanbul, Turkey

    Hasan Tiryaki

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  1. Muhammed Fatih Kılıçaslan
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by MFK, YY, HT and BA. The first draft of the manuscript was written by YY and BA. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Muhammed Fatih Kılıçaslan.

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Kılıçaslan, M.F., Yılmaz, Y., Akgül, B. et al. Effects of flash annealing and external magnetic field on magnetic properties of relatively high Nd content (37% by weight) NdFeB alloy. J Mater Sci: Mater Electron 33, 22728–22735 (2022). https://doi.org/10.1007/s10854-022-08992-2

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