首页|Effect of grain boundary diffusion of terbium on mode of mechanical fracture of sintered NdFeB magnets

Effect of grain boundary diffusion of terbium on mode of mechanical fracture of sintered NdFeB magnets

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Grain boundary diffusion process(GBDP)is a widely used method of increasing the coercivity of sintered NdFeB magnets.In this study,the effects of the GBDP on the bending strength and microhardness of sintered NdFeB magnets and the fracture mode were investigated.Results show that the bending strength of magnets is reduced by pickling and heat treatment and greatly recovers after heavy rare earth element(Tb)grain boundary diffusion.The pickling and the heat treatment cause a slight decrease in microhardness.Compared with the recovery of the bending strength,the hardness decreases after the GBDP.The fracture mode of bended magnets changes from intergranular to transgranular.This study helps in further improving the mechanical and magnetic properties of sintered NdFeB magnets.

Sintered NdFeB magnetsGrain boundary diffusion processBending strengthHeavy rare earth elementCoercivity

Zexin Lu、Tinghui Wang、Jianjun Jiang、Bizhang Zheng、Lijing Yang、Xingqi He、Anli Lin、Shengzhi Dong、Zhenlun Song

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CAS Key Laboratory of Magnetic Materials and Devices,Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo,315201,China

Faculty of Mechanical Engineering and Mechanics,Ningbo University,Ningbo,315211,China

Ningbo Xinqi Precision Magnetism Steel Co.,Ltd.,Ningbo,315156,China

Center for Advanced Measurement Science,National Institute of Metrology,Beijing,102200,China

Division of Functional Materials,Central Iron & Steel Research Institute,Beijing,100081,China

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国家重点研发计划Key Research and Development Program of Ningbo

2021YFB35029022021Z024

2024

10.1016/j.jre.2023.03.022

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2024.42(4)
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