Abstract The coercivity of Nd–Fe–B sintered magnets was progressive enhanced by Tb alloying and Dy grain boundary diffusion (GBD). Every 1 wt% Tb doping led to about 0.37 T linear increase in the coercivity. For all magnets with different Tb content after Dy GBD, the coercivity increased by about 0.7 T with the formation of network enriched with Dy. As Dy diffusion flux was determined by Dy concentration gradient, the coercivity enhancement of Dy GBD was not affected by the Tb content of base magnets. Dy enriched at the TJs diffused along the grain boundary with the Nd-rich phase extending along the grain boundary during post diffusion annealing process. Similar with post sintering annealing, the coercivity increased by about 0.3 T after post diffusion annealing. Therefore, alloying and diffusing different heavy rare earth elements was an effective way to prepare Nd-Fe-B sintered magnets with higher magnetic properties.

中文翻译：

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通过Dy晶界扩散进一步提高Nd-Tb-Fe-B烧结磁体的矫顽力

摘要 Nd-Fe-B 烧结磁体的矫顽力通过 Tb 合金化和 Dy 晶界扩散 (GBD) 逐渐增强。每 1 wt% Tb 掺杂导致矫顽力线性增加约 0.37 T。对于 Dy GBD 后具有不同 Tb 含量的所有磁体，矫顽力增加约 0.7 T，形成富含 Dy 的网络。由于 Dy 扩散通量由 Dy 浓度梯度决定，因此 Dy GBD 的矫顽力增强不受基体 Tb 含量的影响。在 TJ 处富集的 Dy 沿晶界扩散，富 Nd 相在扩散后退火过程中沿晶界延伸。与烧结后退火类似，后扩散退火后矫顽力增加约0.3 T。所以，