| Numéro |
J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|---|---|---|
| Page(s) | C8-573 - C8-574 | |
| DOI | https://doi.org/10.1051/jphyscol:19888260 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-573-C8-574
DOI: 10.1051/jphyscol:19888260
Institute of Metal Research, Academia Sinica, Shenyang, China
J. Phys. Colloques 49 (1988) C8-573-C8-574
DOI: 10.1051/jphyscol:19888260
MICROSTRUCTURE AND COERCIVITY IN (Nd, Dy)-(Fe, Co)-B BASED SINTERED PERMANENT MAGNETS WITH MINOR Nb AND Ga ADDITIONS
G. F. Zhou, X. K. Sun, Y. C. Chuang, L. Gao, Z. Yu, C. L. Xiao et W. LiuInstitute of Metal Research, Academia Sinica, Shenyang, China
Abstract
The microstructure of both Nb- and (Nb, Ga)-containing (Nd, Dy)-(Fe, Co)-B based magnets was examined. A new phase (Fe, Co)NbB, having CoNbB-type orthorhombic structure, was found. Dislocations were visible in the vicinity of the Fe2Nb precipitates in the (Nb, Ga)-containing magnet. The pinning of domain walls through Cottrell-atmosphere around the dislocations and the Ga-improved wettability of Nd-rich phase with respect to the matrix, as possible mechanisms, account for greater increase of coercivity in (Nb,Ga)-containing magnet than in that containing Nb alone.