Abstract：In order to improve the magnetic properties of sintered Nd-Fe-B materials，it is a common way to replace part of the Neodymium with other rare earth elements in the raw materials during sintering，but it would also cause other problems，and the method of grain boundary diffusion has been proved to be a more effective way. In the past，the diffusion characteristics of these substituted rare earth elements were indirectly analyzed by magnetic properties，and there was no convenient method to verify them.In this paper，EPMA was used to study as intered Nd-Fe-B magnetic material with grain boundary diffusion of terbium. The results showed that the element terbium distributed continuously in the grain boundary near the surface layer. Inside the magnet material，the terbium was preferentially concentrated in the bonding regionbetween the mainphase and the grainboundary phase. Compared with the previous indirect description of magnetic properties to ensure distribution of terbium，EPMA mapping analysis results have a more intuitive and readily comprehensible representation.
2019, Vol. 37 
