Coercivity and microstructure of sintered Nd-Fe-B magnets diffused with Pr-Co, Pr-Al, and Pr-Co-Al alloys

doi:10.1088/1674-1056/abc166

Abstract The commercial 42M Nd-Fe-B magnet was treated by grain boundary diffusion (GBD) with Pr₇₀Co₃₀ (PC), Pr₇₀Al₃₀ (PA) and Pr₇₀Co₁₅Al₁₅ (PCA) alloys, respectively. The mechanism of coercivity enhancement in the GBD magnets was investigated. The coercivity was enhanced from 1.63 T to 2.15 T in the PCA GBD magnet, higher than the 1.81 T of the PC GBD magnet and the 2.01 T of the PA GBD magnet. This indicates that the joint addition of Co and Al in the diffusion source can further improve the coercivity. Microstructural investigations show that the coercivity enhancement is mainly attributed to the exchange-decoupling of the GB phases. In the PCA GBD magnet, the wider thin GB phases can be formed and the thin GB phases can still be observed at the diffusion depth of 1500 μ m due to the combined action of Co and Al. At the same time, the formation of the Pr-rich shell can also be observed, which is helpful for the coercivity enhancement.

Keywords: Nd-Fe-B coercivity Pr-Co-Al alloys grain boundary diffusion

Received: 27 August 2020
Revised: 26 September 2020
Accepted manuscript online: 15 October 2020

PACS:	75.60.Nt	(Magnetic annealing and temperature-hysteresis effects)
	75.50.Ww	(Permanent magnets)
	75.50.Vv	(High coercivity materials)
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)

Fund: Project supported by the Key Research and Development Program of Zhejiang Province, China (Grant No. 2021C01190), the Major Project of Science and Technology Innovation 2025 in Ningbo City, China (Grant No. 2018B10015), Zhejiang Province Public Welfare Technology Application Research Project (Grant No. LGG21E010007), the Inner Mongolia Major Technology Project, and the K. C. Wong Magna Fund in Ningbo University.

Corresponding Authors: ^†Corresponding author. E-mail: gshuai@nimte.ac.cn ^‡Corresponding author. E-mail: liuxincai@nbu.edu.cn

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Lei Jin(金磊), Zhe-Huan Jin(金哲欢), Jin-Hao Zhu(朱金豪), Guang-Fei Ding(丁广飞), Bo Zheng(郑波) , Shuai Guo(郭帅), Ren-Jie Chen(陈仁杰), A-Ru Yan(闫阿儒), and Xin-Cai Liu(刘新才) Coercivity and microstructure of sintered Nd-Fe-B magnets diffused with Pr-Co, Pr-Al, and Pr-Co-Al alloys 2021 Chin. Phys. B 30 027503

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Coercivity and microstructure of sintered Nd-Fe-B magnets diffused with Pr-Co, Pr-Al, and Pr-Co-Al alloys

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