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Microstructure and coercivity of grain boundary diffusion processed Dy-free and Dy-containing Nd-Fe-B sintered magnets
| Content Provider | Semantic Scholar |
|---|---|
| Author | Sasaki, Takayoshi Ohkubo, Tadakatsu Takada, Yukio Kato, Akira Kaneko, Yuji Hōno, Kazuhiro |
| Copyright Year | 2019 |
| Abstract | Abstract Dy distributions in Dy-free and Dy-containing Nd Fe B sintered magnets in the course of the Dy-vapor grain boundary diffusion (GBD) process have been investigated in order to understand the origin of the high coercivity of 3.0 T that is reachable only when the initial magnet is alloyed with Dy. We have discovered the formation of a secondary Dy-rich shell within the well-known primary Dy-rich shell, which is a key contributor to the 3.0 T coercivity. The coercivity increment of the Dy-containing magnet after the GBD treatment was only 0.08 T, much lower than 0.87 T for the Dy-free magnet; however, it was substantially enhanced by a post-diffusion annealing. Compared to the Dy-free magnet, a larger amount of Dy atoms were diffused from the Nd-rich grain boundary (GB) phase to the primary Dy-rich shell in the Dy-containing magnet after the annealing, resulting in the formation of a secondary Dy-rich shell with a higher Dy-concentration at the GB phase/secondary shell interfaces. |
| Starting Page | 139 |
| Ending Page | 149 |
| Page Count | 11 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/j.actamat.2019.04.032 |
| Volume Number | 172 |
| Alternate Webpage(s) | https://www.magnetics.jp/kouenkai/2019/doc/program/25aA-5.pdf |
| Alternate Webpage(s) | https://doi.org/10.1016/j.actamat.2019.04.032 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
