Abstract
Fe82Cu1Si4B11.5Nb1.5−xMox (x=0, 0.75 and 1.5 at. %) nanocrystalline alloys were prepared using a melt-spinning technique and the effects of Mo content on thermal stability, soft magnetic properties and microstructure evolution were investigated. It was found that the Mo addition can improve the amorphous-forming ability and inhibit surface crystallization in a low vacuum atmosphere which may be due to better oxidative resistance. All the alloys exhibited excellent soft-magnetic properties with low coercivity of 8.9–10.8A/m, high effective permeability of 11,500–11,900 at 1kHz and high saturation magnetic flux density of 1.67–1.72T after annealing at optimal annealing conditions. In addition, the alloys containing Mo have better transient effective permeability stability with increase in frequency. Decreasing the melt-spinning wheel speed can widen the annealing temperature range for Fe82Cu1Si4B11.5Nb1.5 ribbon. Results indicate that these soft-magnetic nanocrystalline materials have good manufacturability for industrial production.
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