Abstract The coercivity of hot-deformed Ce-Fe-B magnet was substantially improved from ∼8 × 10−4 to ∼0.7 T by the grain boundary infiltration of Nd-Cu eutectic alloy. Transmission electron microscopy have shown the formation of (NdxCe1-x)2Fe14B shell in Ce2Fe14B grains and the increase of rare earth elements in the intergranular phases after the process. The former enhances the anisotropy field of the shell region and the latter weakens intergranular exchange coupling. Micromagnetic simulations showed that the increase of the Nd content in the (NdxCe1-x)2Fe14B shell results in only a slight increase in coercivity for ferromagnetic intergranular phase. This explains the minor increment of coercivity of only ∼0.2 T for the increased amount of the Nd-Cu infiltration from 10 wt% to 40 wt%. For further increase of the coercivity, exchange decoupling by increasing the rare earth content in the intergranular phase is predicted to be effective.

中文翻译：

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Nd-Cu共晶合金晶界渗透提高Ce-Fe-B热变形磁体矫顽力

摘要 通过 Nd-Cu 共晶合金的晶界渗透，热变形 Ce-Fe-B 磁体的矫顽力从~8 × 10-4 显着提高到~0.7 T。透射电子显微镜显示 (NdxCe1-x)2Fe14B 壳层在 Ce2Fe14B 晶粒中的形成以及此过程后晶间相中稀土元素的增加。前者增强了壳区的各向异性场，后者减弱了晶间交换耦合。微磁模拟表明，(NdxCe1-x)2Fe14B 壳中 Nd 含量的增加仅导致铁磁晶间相的矫顽力略有增加。这解释了对于将 Nd-Cu 渗透量从 10 wt% 增加到 40 wt%，矫顽力仅增加约 0.2 T 的原因。为了进一步提高矫顽力，