Abstract
The effects of Cu addition and annealing treatment on the magnetic properties and microstructure of Nd 12.3Fe 81.7– x Cu x B 6 ( x=0–1.2) ribbons melt-spun and annealed were systematically investigated by the methods of vibrating sample magnetometer (VSM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). Optimum magnetic properties were achieved by annealing melt-spun Nd 12.3Fe 81.5Cu 0.2B 6 ribbons at 550°C for 15 min, which only contained Nd 2Fe 14B phase. The remanence, coercive force, and maximum energy product increase by 18.4%, 36.2%, and 49% respectively compared with those of Cu-free samples. The significant improvement in magnetic properties originates from the finer grains of the samples by introducing Cu, which leads to the stronger exchange-coupling between neighboring grains.
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