Microstructure of hot-pressed and die-upset magnequench magnets (abstract)

Hot pressing is a convenient method for preparing fully dense Nd-Fe-B magnets from the melt-spun ribbons. Die-upsetting the hot-pressed material produces an aligned high-energy product magnet.1 Transmission electron microscopy was used to study the microstructures of both the hot-pressed and the die-upset magnets. For a starting composition of Nd14Fe81B5, it is found that the magnetic Nd2Fe14B phase comprises over 95% of the material. In the …