Rare earth amorphous alloy for grain boundary diffusion of iron-based rare earth permanent magnet and diffusion process of rare earth amorphous alloy

The invention belongs to the field of magnetic materials, and particularly relates to a rare earth amorphous alloy for grain boundary diffusion of an iron-based rare earth permanent magnet and a diffusion process of the rare earth amorphous alloy. The rare earth amorphous alloy for magnet grain boundary diffusion is composed of rare earth and non-rare earth elements, has the advantages of being low in heavy rare earth content, low in melting point, good in wettability, high in atom migration rate and the like when serving as a grain boundary diffusion source, and can achieve regulation and control over the microstructure, phase distribution and chemical composition of a magnet. On the premise of greatly improving the performance of the magnet, the use amount of heavy rare earth is remarkably reduced, the diffusion heat treatment temperature is reduced, the diffusion depth is increased, high-efficiency utilization of grain boundary diffusion heavy rare earth elements is achieved, and the comprehensive performa