Understanding the evolution of phase and microstructure is a critical step to prepare high performance magnets. In this work, hot deformed (HD) Ce–Fe–B magnets with different Ce contents are prepared. The results demonstrate that the content of CeFe₂ phase is enhanced with increasing Ce content. And its distribution changes from the sporadic distribution for Ce_13.5Fe₈₁B_5.5 magnet to the mixed distribution consisting of large strip-shaped grains and dispersed distribution around main phase for Ce₁₇Fe₇₈B₅ magnet to the nearly complete dispersed distribution for Ce₂₁Fe₇₄B₅ magnet. These CeFe₂ phase around main phase can increase magnetic isolation effect, improving the coercivity of HD magnet. In addition, it is found that a large amount of CeFe₂ phase and equiaxed 2:14:1 phase grain without c-axis orientation surround each other, indicating that the CeFe₂ phase is not favorable to the formation of c-axis orientation. Elemental metallurgical behavior reveals that Pr and Cu elements are segregated between platelet-shaped main phase grains, and however, for equiaxed grain region, Pr and Cu elements are enriched in CeFe₂ phase. Based on the grain boundary diffusion (GBD), the coercivity, remanence and magnetic energy product are all improved significantly, increasing by 287%, 74%, and 371%, respectively, which is attributed to the formed (Pr, Ce)₂Fe₁₄B phase and increased magnetic isolation effects.

了解相和微观结构的演变是制备高性能磁体的关键步骤。在这项工作中，制备了具有不同 Ce 含量的热变形 (HD) Ce-Fe-B 磁体。结果表明，随着Ce含量的增加，CeFe _{2相的含量增加。}其分布从Ce _13.5 Fe ₈₁ B _{5.5磁体的零星分布转变为Ce 17} Fe ₇₈ B ₅磁体由大条状晶粒和分散分布在主相周围的混合分布到Ce ₂₁几乎完全分散的分布。铁₇₄ B ₅磁铁。主相周围的这些CeFe ₂相可以增加磁隔离效果，提高HD磁体的矫顽力。此外，发现大量的CeFe ₂相和无c轴取向的等轴2:14:1相晶粒相互包围，表明CeFe ₂相不利于c轴取向的形成。元素冶金行为表明，Pr和Cu元素偏析在片状主相晶粒之间，而在等轴晶区，Pr和Cu元素富集在CeFe _2中。阶段。基于晶界扩散（GBD），矫顽力、剩磁和磁能积均显着提高，分别提高了 287%、74% 和 371%，这归因于形成的 (Pr, Ce) ₂ Fe ₁₄ B 相和增加的磁隔离效果。