Nd-Fe-B anisotropic bonded magnets

To understand the role of the Ga addition which enhances coercivity in Nd14Fe79.25B6Ga0.75 die upset magnets, metallurgical investigations using Auger electron spectroscopy (AES) and energy-dispersive x-ray spectroscopy-transmission electron microscopy (EDX-TEM) were done. Ga has a tendency to be condensed in the Nd rich phase (higher than 2 wt%) and Ga content in the matrix is around 0.2 wt%. The Ga solution in these phases seems to strengthen the pinning force defined at the interface of the matrix and the Nd rich phase.