Textured (Ce,La,Y)-Fe-B permanent magnets by hot deformation

X. Liao, L. Zhao, J. Zhang, K. Xu, B. Zhou, H. Yu, X. Zhang, J.-M. Greneche, A. Aubert, K. Skokov, O. Gutfleisch, Z. Liu, Journal of Materials Research and Technology 17, 1459-1468 (2022).

Nanocrystalline 2:14:1-type Ce-Fe-B alloy powders show potential application for low-cost hard magnets, but it is still a big challenge to prepare bulk anisotropic Ce-Fe-B magnet. In this study, we investigated the fabrication of bulk Ce-Fe-B, (Ce,La)-Fe-B and (Ce,La,Y)-Fe-B magnets by hot-deformation. It is found that no texture can be obtained for Ce-Fe-B ternary alloy after deformation due to the lack of rare-earth rich phase. However, a clear preferred orientation is obtained in the magnets with La substitution for Ce. The formation of texture is attributed to the reduced amount of CeFe2 Laves phase in the (Ce,La)-Fe-B alloy, allowing the formation of a rare-earth rich intergranular phase, which is necessary to induce texture during hot deformation. Adding Y improves the thermal stability of the magnets while maintaining the texture. The bulk [(Ce0.9La0.1)0.8Y0.2]16.83Fe77.23B5.94 magnet exhibits an intrinsic coercivity of 124 kA/m, a remanence of 0.63 T and a maximum energy product of 29.5 kJ/m3. This study provides a feasible approach for fabricating anisotropic nanocrystalline Ce-based 2:14:1-type permanent magnets with considerable hard magnetic properties.

DOI: 10.1016/j.jmrt.2022.01.106