NdFeB MAGNET AND PREPARATION METHOD

A NdFeB magnet comprising main phase grains, thin-layer grain boundary phases, and triangular grain boundary phases, wherein:

• the NdFeB magnet includes R, B, Co, Cu, Ga, M2, M3, and Fe, wherein:
• a content of R in the NdFeB magnet is in a range of 28 to 32 wt %, where R represents a rare earth element, and R includes at least Pr and Nd;
• a content of B in the NdFeB magnet is in a range of 0.84 to 0.94 wt %;
• a content of Cu in the NdFeB magnet is in a range of 0.05 to 0.55 wt %;
• a content of Co in the NdFeB magnet is in a range of 0.05 to 1 wt %;
• a content of Ga in the NdFeB magnet is in a range of 0.3 to 0.6 wt %;
• a content of M2 in the NdFeB magnet is in a range of 0 to 0.55 wt %, where M2 represents one or more selected from Al and Sn;
• a content of M3 in the NdFeB magnet is in a range of 0.1 to 0.6 wt %, where M3 represents one or more selected from Zr and Ti;
• and
• a content of Fe in the NdFeB magnet is in a range of 66 to 70 wt %;
• the triangular grain boundary phases include R6T13M1 phase, where the R6T13M1 phase includes M and T, where the M includes any two or more selected from Al, Cu, Ga, Ti, Sn, and/or Zr, and the T includes Fe and/or Co;
• and
• a total area of the R6T13M1 phase within a microscopic structure cross-section of the NdFeB magnet is in a range of 5.2% to 8.4% of a total cross-sectional area of the microscopic structure cross-section.