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

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. (C) 2022 The Author(s). Published by Elsevier B.V.

Automated summary

Nanocrystalline 2:14:1-type Ce-Fe-B alloy powders have shown potential for low-cost hard magnets. This study successfully fabricated bulk anisotropic Ce-based 2:14:1-type permanent magnets through hot-deformation and investigated the effects of La and Y substitutions. La substitution resulted in a clear preferred orientation, while the addition of Y improved thermal stability. The obtained magnet exhibited good hard magnetic properties.