The dual trend of diffusion of heavy rare earth elements during the grain boundary diffusion process for sintered Nd-Fe-B magnets

Diffusion of heavy rare earth elements (HREEs, Tb and Dy) after being coated on sintered Nd-Fe-B magnets by direct current magnetron sputtering was investigated. The results reveal that gain of the coercivity shows a higher efficiency of HREE consumption compared with other coating methods. The HREE...

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Bibliographic Details
Published in:Scripta materialia 2018-04, Vol.148, p.29-32
Main Authors: Wu, Binghui, Ding, Xuefeng, Zhang, Qingke, Yang, Lijing, Zheng, Bizhang, Hu, Fangqin, Song, Zhenlun
Format: Article
Language:English
Subjects:
Coercivity
Grain boundary diffusion
Heavy rare earth elements
Nd-Fe-B magnet
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Summary:Diffusion of heavy rare earth elements (HREEs, Tb and Dy) after being coated on sintered Nd-Fe-B magnets by direct current magnetron sputtering was investigated. The results reveal that gain of the coercivity shows a higher efficiency of HREE consumption compared with other coating methods. The HREE diffuses along the grain boundary phase (GBP) deep into the magnet, an HREE-rich shell forms at the superficial layer of the diffused Nd2Fe14B grains, and the HREE in the magnets shows a dual-trend distribution. The diffusion of HREE includes a fast diffusion in the GBP and a slow diffusion in the grain phase (GP). [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2018.01.021