Effect of In doping on the evolution of microstructure, magnetic properties and corrosion resistance of NdFeB magnets

doi:10.1088/1674-1056/ad0e5c

Abstract The grain boundary phase affects the magnetic properties and corrosion resistance of sintered NdFeB magnets. In this work, a small amount of In was added to NdFeB magnets by induction melting to systematically investigate its effect on the evolution of the microstructure, magnetic properties and corrosion resistance of NdFeB magnets. Microstructural analysis illustrated that minor In addition generated more grain boundary phases and an abundant amorphous phase at the triple-junction grain boundary. While the addition of In failed to enhance the magnetic isolation effect between adjacent matrix grains, its incorporation fortuitously elevated the electrochemical potential of the In-containing magnets. Besides, during corrosion, an In-rich precipitate phase formed, hindering the ingress of the corrosive medium into the magnet. Consequently, this significantly bolstered the corrosion resistance of the sintered NdFeB magnets. The phase formation, magnetic properties and corrosion resistance of In-doped NdFeB magnets are detailed in this work, which provides new prospects for the preparation of high-performance sintered NdFeB magnets.

Keywords: In-doping NdFeB magnets magnetic properties corrosion resistance

Received: 07 August 2023
Revised: 20 November 2023
Accepted manuscript online: 21 November 2023

PACS:	75.50.Ww	(Permanent magnets)
	68.35.bd	(Metals and alloys)
	82.45.Bb	(Corrosion and passivation)
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)

Fund: This work was funded by Ningbo Key R&D Plan and “Unveiling and Leading” (Grant No. 2023Z093), Ningbo Science and Technology Innovation 2025 Major Special Project (Grant No. 2022Z106), and Hezhou City Central Leading Local Science and Technology Development Special Fund Project (Grant No. HK ZY2022002).

Corresponding Authors: Xincai Liu, Shuai Guo, Bo Zheng
E-mail: liuxincai@nbu.edu.cn;gshuai@nimte.ac.cn;zhengbo@nimte.ac.cn

Cite this article:

Yuhao Li(李豫豪), Xiaodong Fan(范晓东), Zhi Jia(贾智), Lu Fan(范璐), Guangfei Ding(丁广飞), Xincai Liu(刘新才), Shuai Guo(郭帅), Bo Zheng(郑波), Shuai Cao(曹帅), Renjie Chen(陈仁杰), and Aru Yan(闫阿儒) Effect of In doping on the evolution of microstructure, magnetic properties and corrosion resistance of NdFeB magnets 2024 Chin. Phys. B 33 037508

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Effect of In doping on the evolution of microstructure, magnetic properties and corrosion resistance of NdFeB magnets

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