To investigate the influence of the addition of Pr–Ga alloys on magnetic properties and morphology of materials, the hot-deformed PrNd-Fe-B magnets were prepared by the addition of Pr–Ga alloys using a dual-alloys diffusion. The room-temperature coercivity of the hot-deformed PrNd-Fe-B magnets increases substantially from 1.68 to 2.34 T, while the remanence decreases from 1.42 to 1.24 T, by the addition of 5 wt% Pr–Ga alloys. Moreover, the thermal stability of coercivity improves from −0.46%/^oC to −0.42%/^oC. Two types of grain boundary phases (PrNd-rich and PrNd-Ga-rich) are generated at grain boundaries by microstructural analysis, resulting in the decrease of Fe element concentration from more than 60% to about 10% at grain boundaries. The decrease of ferromagnetic element concentration at grain boundaries and the refinement of grain are considered to be the main reasons for the improvement of coercivity and thermal stability.

为了研究添加 Pr-Ga 合金对材料磁性能和形貌的影响，通过使用双合金扩散添加 Pr-Ga 合金制备了热变形 PrNd-Fe-B 磁体。通过添加 5 wt% 的 Pr-Ga 合金，热变形 PrNd-Fe-B 磁体的室温矫顽力从 1.68 T 显着增加至 2.34 T，而剩磁从 1.42 T 降低至 1.24 T。此外，矫顽力的热稳定性从 -0.46%/ ^o C 提高到 -0.42%/ ^oC. 通过显微组织分析，在晶界处生成了两种晶界相（富 PrNd 和富 PrNd-Ga），导致晶界处 Fe 元素浓度从 60% 以上降低到 10% 左右。晶界处铁磁元素浓度的降低和晶粒的细化被认为是矫顽力和热稳定性提高的主要原因。