Structural evolution of anisotropic SmCo_6.8Hf_0.2 nanocrystalline magnet prepared by hot deformation

Abstract

SmCo₇-based permanent magnets with a TbCu₇-type structure have excellent high-temperature performance. However, most of the previously reported SmCo₇ nanocrystalline magnets were isotropic, which limited their application. So the preparation of anisotropic SmCo₇ magnets with preferred texture is still a challenge. In this work, we prepared anisotropic SmCo_6.8Hf_0.2 nanocrystalline magnets by hot pressing and hot deformation method. EBSD results indicated that the {0001} orientation texture of the hot deformed magnet was remarkably preferred, which further improved the remanence. Subsequently, the structural evolution process was systematically characterized by TEM. It provides crucial insight for developing high-performance SmCo₇-based magnets.

Impact Statement: Up to now, most of the previously reported SmCo₇ nanocrystalline magnets were isotropic, which limited their application. This work opens up new opportunities to create high-performance SmCo₇-based nanostructured magnets.

GRAPHICAL ABSTRACT

KEYWORDS:

• Hot deformation
• anisotropic nanocrystalline magnet
• precipitated phase
• phase transition
• twins

Disclosure statement

No potential conflict of interest was reported by the author(s).

Acknowledgements

This work was supported by the Natural Science Foundation of China (51871005, 51931007), and by the Key Program of Science and Technology Development Project of Beijing Municipal Education Commission of China under Grant (KZ202010005009).

Additional information

Funding

This work was supported by Key Program of Science and Technology Development Project of Beijing Municipal Education Commission of China under Grant: [Grant Number KZ202010005009]; Natural Science Foundation of China: [Grant Number 51871005,51931007].