Formation of anti-shell/core structure of heavy rare earth elements (Tb, Dy) in sintered Nd-Fe-B magnet after grain boundary diffusion process
| Autor: | Qingke Zhang, Cheng Xu, Lijing Yang, Zhenlun Song, Bizhang Zheng, Song Xiao, Qihang Zhu, Shoudong Mao, Wei Li |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Mechanical Engineering Metals and Alloys Shell (structure) 02 engineering and technology Coercivity 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Core (optical fiber) Mechanics of Materials Magnet 0103 physical sciences Grain boundary diffusion coefficient General Materials Science Grain boundary Diffusion (business) 0210 nano-technology |
| Zdroj: | Scripta Materialia. 163:40-43 |
| ISSN: | 1359-6462 |
| Popis: | The evolution of microstructure close to the surface of sintered Nd-Fe-B magnet after grain boundary diffusion process (GBDP) of heavy rare earth elements (HREE, Tb, Dy) was investigated. It was found that two new types of microstructure, anti-shell/core and no-shell structures, were formed in the magnet with the diffusion time longer than 0.5 h. The anti-shell/core structure was formed due to an abnormal diffusion of HREE from grain to grain boundary based on the dual-trend diffusion model, it contributes a negative effect on the coercivity of diffused magnets. |
| Databáze: | OpenAIRE |
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