New energy vehicles and offshore wind power industries have a high demand for sintered Nd–Fe–B magnets with high intrinsic coercivity and high corrosion resistance. In this study, the magnetic properties, anticorrosion properties, and microstructure of Nd–Fe–B sintered magnets with the intergranular addition of low-melting-point eutectic Tb₆₈Ni₃₂ alloy powders were investigated. The aim is to determine if the addition of Tb₆₈Ni₃₂ can improve these properties. A low melting-point eutectic alloy Tb₆₈Ni₃₂ powders was prepared as a grain boundary additive and blended with the master alloy powders prior to sintering. The coercivity of the resultant magnets gradually increases from 1468 to 2151 kA/m by adding increasing amounts of Tb₆₈Ni₃₂. At the same time, the remanence first increases and then slightly decreases. After studying the microstructure and elemental composition of the Tb₆₈Ni₃₂ added magnets, it is found that the significant increase in coercivity and the negligible reduction in remanence is due to densification, improved grain orientation, a uniform and continuous boundary phase distribution, as well as the generation of a (Nd,Pr,Tb)₂Fe₁₄B “core–shell” structure surrounding the main-phase grain. Moreover, the corrosion resistance of the magnet is greatly improved owing to the enhancement of electrochemical stability, as well as the optimization of the distribution and morphology of the intergranular phase.

新能源汽车和海上风电行业对具有高内禀矫顽力和高耐腐蚀性的烧结钕铁硼磁体有很高的需求。在这项研究中，研究了晶间添加低熔点共晶 Tb ₆₈ Ni ₃₂合金粉末的 Nd-Fe-B 烧结磁体的磁性能、防腐性能和微观结构。目的是确定添加 Tb ₆₈ Ni ₃₂是否可以改善这些性能。低熔点共晶合金 Tb ₆₈ Ni ₃₂粉末被制备为晶界添加剂，并在烧结前与母合金粉末混合。_{通过添加越来越多的Tb 68} Ni ₃₂，所得磁体的矫顽力从1468逐渐增加到2151 kA/m 。同时，剩磁先增加后略有减少。_{在研究了添加 Tb 68} Ni ₃₂磁体的显微组织和元素组成后，发现矫顽力显着增加而剩磁减少可忽略不计是由于致密化、改善晶粒取向、均匀连续的边界相分布以及作为 (Nd,Pr,Tb) ₂ Fe _14的生成B 围绕主相晶粒的“核壳”结构。此外，由于电化学稳定性的增强，以及晶间相分布和形态的优化，磁体的耐腐蚀性能得到很大提高。