The dual trend of diffusion of heavy rare earth elements during the grain boundary diffusion process for sintered Nd-Fe-B magnets. (15th April 2018)

• Record Type: Journal Article
• Authors: Wu, Binghui; Ding, Xuefeng; Zhang, Qingke; Yang, Lijing; Zheng, Bizhang; Hu, Fangqin; Song, Zhenlun
• Is Part Of: Scripta materialia. Number 148(2018)
• Page Start: 29
• Page End: 32
• Publication Date: 2018-04-15
• Subjects: Grain boundary diffusion -- Heavy rare earth elements -- Coercivity -- Nd-Fe-B magnet; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.01.021
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: 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 Nd2 Fe14 B 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). Graphical abstract: Unlabelled Image