Phase structure evolution and its effect on magnetic and mechanical properties of B-doped Sm2Co17-type magnets with high Fe content

doi:10.1088/1674-1056/ad5535

Abstract The unique cellular microstructure of Fe-rich Sm$_{2}$Co$_{17}$-type permanent magnets is closely associated with the structure of the solid solution precursor. We investigate the phase structure, magnetic properties, and mechanical behavior of B-doped Sm$_{2}$Co$_{17}$-type magnets with high Fe content. The doped B atoms can diffuse into the interstitial vacancy, resulting in lattice expansion and promote the homogenization of the phase organizational structure during the solid solution treatment in theory. However, the resulting second phase plays a dominant role to result in more microtwin structures and highly ordered 2 : 17R phases in the solid solution stage, which inhibits the ordering transformation of 1 : 7H phase during aging and affects the generation of the cellular structure, and to result in a decrease in magnetic properties, yet the interface formed between it and the matrix phase hinders the movement of dislocations and enhances the mechanical properties. Hence, the precipitation of high flexural strain grain boundary phase induced by B element doping is also a new and effective way to improve the flexural strain of Sm$_{2}$Co$_{17}$-type magnets. Our study provides a new understanding of the phase structure evolution and its effect on the magnetic and mechanical properties of Sm$_{2}$Co$_{17}$-type magnets with high Fe content.

Keywords: Sm$_{2}$Co$_{17}$-type magnets magnetic and mechanical properties

Received: 05 March 2024
Revised: 24 May 2024
Accepted manuscript online: 07 June 2024

PACS:	75.30.Gw	(Magnetic anisotropy)
	68.60.Dv	(Thermal stability; thermal effects)
	71.20.Eh	(Rare earth metals and alloys)
	75.50.Ww	(Permanent magnets)

Fund: This work was financially supported by the National Key R&D Program of China (Grant Nos. 2021YFB3503102 and 2022YFB3505301), Science and Technology Innovation 2025 Major Project of Ningbo (Grant No. 2022Z204), Zhejiang Provincial Natural Science Foundation Youth Original Project (Grant No. LDQ24E010001), the Key R&D Program of Shanxi Province (Grant No. 202302050201014), and Ningbo Natural Science Foundation (Grant No. 2021J216).

Corresponding Authors: Zhuang Liu, Fang Wang
E-mail: zliu@nimte.ac.cn;wangfanghc@sxnu.edu.cn

Cite this article:

Yao-Wen Li(李耀文), Zhuang Liu(刘壮), Hai-Chen Wu(吴海辰), Fang Wang(王芳), Chao-Qun Zhu(竺超群), Dong-Liang Tan(谭栋梁), Yu Liu(刘宇), Yang Yang(羊杨), Ming-Xiao Zhang(张明晓), Ren-Jie Chen(陈仁杰), and A-Ru Yan(闫阿儒) Phase structure evolution and its effect on magnetic and mechanical properties of B-doped Sm₂Co₁₇-type magnets with high Fe content 2024 Chin. Phys. B 33 097504

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Phase structure evolution and its effect on magnetic and mechanical properties of B-doped Sm2Co17-type magnets with high Fe content

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Phase structure evolution and its effect on magnetic and mechanical properties of B-doped Sm₂Co₁₇-type magnets with high Fe content