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

作者：Liao, Xuefeng; Zhao, Lizhong; Zhang, Jiasheng; Xu, Ke; Zhou, Bang; Yu, Hongya; Zhang, Xuefeng; Greneche, Jean-Marc; Aubert, Alex; Skokov, Konstantin; Gutfleisch, Oliver; Liu, Zhongwu^*

来源：Journal of Materials Research and Technology-JMR&T, 2022, 17: 1459-1468.

DOI：10.1016/j.jmrt.2022.01.106

• Hot-deformation
• Ce-Fe-B based Magnets
• Texture
• Anisotropic magnet
• CeFe2 phase

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)(0.8)Y-0.2](16.83)Fe77.23B5.94 magnet exhibits an intrinsic coercivity of 124 kA/m, a remanence of 0.63 T and a maximum energy product of 29.5 kJ/m(3). This study provides a feasible approach for fabricating anisotropic nanocrystalline Ce-based 2:14:1-type permanent magnets with considerable hard magnetic properties.