The microstructure of hot formed neodymium–iron–boron magnets with energy product 48 MG Oe

Melt-spun Nd–Fe–B ribbons containing small amounts of Co, Ga, and C were die upset to 60% and 70% reduction in height in an argon atmosphere between 750 and 800 °C. The magnet, which was die upset 70%, has a remanence of 14.2 kG, Hci of 14.8 kOe, and (BH)max of 48 MG Oe. The interior of the magnet consists of well-aligned Nd2Fe14B grains separated by a Nd-rich intergranular phase. Intermixed with such aligned grains, we observed zones of …