Abstract
The influences of Niobium doping on the glass-forming ability (GFA) and magnetization properties of Nd–Fe–B–Nb alloys were investigated. It is found that the GFA of Nd–Fe–B–Nb alloys are improved by the Nb addition. It is also revealed that the GFA of the samples increases with the Nb content. Rapidly solidified Nd4.5Fe77−xNbxB18.5 (x = 0, 0.25, 0.5, 0.75, 1) nanocomposite strip flakes were successfully prepared by using strip casting technique with a higher production efficiency and a lower cooling rate compared to melt spinning method. The coercivity of nanocomposite Nd–Fe–B–Nb alloy strip flakes can be dramatically enhanced by 0.5 at. % Nb addition, attributing to grain refinement. The best magnetic properties with Hcj = 278.9 kA/m, (BH)max = 41.06 kJ/m3 have been obtained in Nd4.5Fe76.5Nb0.5B18.5 nanocomposite strip flake, which can be used for bonded magnets. The recoil loss of Nd4.5Fe76.5Nb0.5B18.5 alloy is also reduced by the Nb addition.
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