Abstract
(Nd1–xCex)12Fe77Ti5B6 (x = 0, 0.2, 0.3, 0.4, 0.6, 0.8) alloys were prepared by melt-spinning and annealing techniques. The phase constitutions, microstructures and magnetic properties were investigated by powder X-ray diffraction (XRD), a differential scanning calorimeter (DSC), a vibrating sample magnetometer (VSM) and a transmission electron microscope (TEM). It is found that with the increase of Ce content, the coercivity of the (Nd1–xCex)12Fe77Ti5B6 alloys reaches maximum first and then decreases. The maximum coercivity reaches 18.5 kOe obtained in the sample of 20% Ce substituted which is 34% higher than the Ce-free sample. TEM results reveal that the microstructure refinement effect is responsible for the coercivity improvement. This phenomenon implies that in some cases, Ce and Ti co-doping is more beneficial to improving of the coercivity than Ti single doping in Nd-Fe-B alloys. With further Ce addition, magnetic properties deteriorate due to the formation of CeFe2 and TbCu7-type phases.
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