High-performance multiphase Sm-Co-B alloys with coercivities up to 6.71 MA·m−1

Shu Wang, Ji-Bing Sun (), Xiang Chi (), Mu-Jing Zhou, Hao-Yu Ma, Ying Zhang () and Jian Liu ()
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Shu Wang: Hebei University of Technology
Ji-Bing Sun: Hebei University of Technology
Xiang Chi: Songshan Lake Materials Laboratory
Mu-Jing Zhou: Hebei University of Technology
Hao-Yu Ma: Hebei University of Technology
Ying Zhang: Chinese Academy of Sciences
Jian Liu: Shanghai University

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract SmCo4B-based alloys with high magnetocrystalline anisotropy are expected to be used as raw materials or constituent phases for new permanent magnets. In this work, we develop Sm(Co, Fe, Ni)4B alloys with excellent hard magnetic properties by tuning the contents of Fe, Co, and Ni. The addition of Fe enhances the amorphous formation ability of the as-spun ribbons, whereas Ni addition improves the structural stability of the crystalline phases. During annealing, the amorphous phase crystallizes into different Sm-Co-B phases in stages. A high coercivity of 5.68–6.71 MA·m−1 is obtained in the annealed SmCo4–x–yFexNiyB (x = 1.0–2.0, y = 0.8–1.0) ribbons composed of platelet-shaped and equiaxed grains in comparison with the coercivity of 2.89–5.18 MA·m−1 in the x = 1.0–1.2 and y = 0–0.8 ribbons with equiaxed grains. Here, we show the strong correlations between the microstructure and magnetic properties and provide insights for the future development of high-performance SmCo4B-based magnets.

Date: 2024
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DOI: 10.1038/s41467-024-54610-6

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