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Effect of melt-spinning speed on the microstructure and magnetic properties of Al–Cu–Fe alloy-doped SmCo5 ribbons

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Abstract

Multielement alloy doping is the feature of this paper, and disclosing the relationship between non-equilibrium microstructure and magnetic properties after rapid cooling is the key point. 3 wt% eutectic Al82.8Cu17Fe0.2 alloy was doped into SmCo5 alloy, followed by melt-spinning at 10–40 m/s. It is found all ribbons are composed of Sm(Co, M)5 and Sm2(Co, M)7 phases, but non-equilibrium solidification at different cooling rates results in different distribution characteristics of phases and magnetic properties of the ribbons. The 10 m/s ribbons are composed of Sm–Cu- and Co-rich Sm(Co, M)5 phases and then the lamellate Sm2(Co, M)7 coexists with CeCo5-type Sm(Co, M)5 grains in the 25 m/s ribbons, while the 40 m/s ribbons form a cellular microstructure with Sm2(Co, M)7 grain boundaries and Sm(Co, M)5 intracellular grains. Correspondingly, the coercivity, remanence, and maximum magnetization of 40 m/s ribbons are 74.3%, 64.3%, and 53.2% higher than those of 10 m/s ribbons. At the same time, the coercivity mechanism and microstructure evolution are discussed.

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Acknowledgements

This work was supported by the General Program from the National Natural Science Foundation of China (NNSFC) (No. 51671078) and the Natural Science Foundation of Hebei province, China (No. E2019202035).

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  1. Key Laboratory for New Type of Functional Materials in Hebei Province, Hebei University of Technology, Beichen District, No. 5340 Xiping Road 1, Tianjin, 300401, People’s Republic of China

    Li-Zhu Wang, Shu Wang, Zhi-Ying Zhang, Hong-Wei Wang, Ji-Bing Sun & Chun-Xiang Cui

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Correspondence to Ji-Bing Sun.

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Wang, LZ., Wang, S., Zhang, ZY. et al. Effect of melt-spinning speed on the microstructure and magnetic properties of Al–Cu–Fe alloy-doped SmCo5 ribbons. Appl. Phys. A 127, 202 (2021). https://doi.org/10.1007/s00339-021-04359-2

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