Microstructure and magnetic performance of Nd-Y-Ce-Fe-B sintered magnets after annealing

• 作者: Xiao-Lian Liu Xiao-Wei Wu Jia-Ying Jin Yong-Ming Tao Xin-Hua Wang Mi Yan
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2022,（3）
• 所属期刊栏目: LETTERS
• 页码范围: 859-864
• 页数: 6页
• 语种: 英文

摘要

Annealing has been widely recognized as a crucial approach to modify the microstructure and enhance the coercivity of Nd-Fe-B magnets.However,in the context of Nd-Y-Ce-Fe-B magnets with multiple rare earths(REs)exhibiting different diffusion behaviors,annealing effects on the magnetic properties become more compli-cated and remain unknown.In present work,through a comparative study between as-sintered and annealed Nd-Y-Ce-Fe-B magnet upon 50 wt％Y-Ce co-substitution of total REs,we found that annealing process surprisingly enhances the remanence from 1.17 to 1.20 T,with simultaneous coercivity increment from 612.9 to 660.7 kA·m-1,resulting in drastically improved maximum energy product from 242.0 to 263.5 kJ·m-3.Such a pecu-liar remanence enhancement is closely correlated to the preferential Y/Nd infiltration into RE2Fe14B main phase and Ce segregation into REFe2 intergranular phase,which consequently improve the intrinsic magnetism,as evalu-ated by Curie temperature(Tc),saturation magnetic polarization(Js)and magnetocrystalline anisotropy field(HA).Present work delights that different metallurgical behaviors of Nd/Y/Ce exert influential effects on the intrinsic and extrinsic magnetic properties and provide a novel approach toward high-performance 2:14:1-type per-manent magnets based on abundant RE mixtures.