Abstract
The effects of ribbon thickness (t) on the structure and magnetic properties of a Fe82.3B13Cu1.7Nb3 alloy in melt-spun and annealed states have been investigated. Increasing the t from 15 to 23 μm changes the structure of the melt-spun ribbons from a single amorphous phase to a composite with dense α-Fe nanograins embedded in the amorphous matrix. The grain size (Dα-Fe) of the α-Fe near the free surface of the ribbon is about 6.7 nm, and it gradually decreases along the cross section toward the wheel-contacted surface. Further increasing the t to 32 μm coarsens the Dα-Fe near the free surface to 15.2 nm and aggravates the Dα-Fe ramp along the cross section. After annealing, the ribbon with t = 15 μm has relatively large α-Fe grains with Dα-Fe > 30 nm, while the thicker ribbons possessing the pre-existing nanograins form a finer nanostructure with Dα-Fe < 16 nm. The structural uniformity of the ribbon with t = 23 μm is better than that of the ribbon with t = 32 μm. The annealed ribbons with t = 23 and 32 μm possess superior soft magnetic properties to the ribbon with t = 15 μm. The ribbon with t = 23 μm exhibits a high saturation magnetic flux density of 1.68 T, low coercivity of 9.6 A/m, and high effective permeability at 1 kHz of 15,000. The ribbon with t = 32 μm has a slightly larger coercivity due to the lower structural uniformity. The formation mechanism of the fine nanostructure for the ribbons with suitable t has been discussed in terms of the competitive growth effect among the pre-existing α-Fe nanograins.
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This research was financially supported by the National Natural Science Foundation of China (Grant Nos. 51871039, 51771039 and 51571047).
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Wu, LC., Li, YH., Jia, XJ. et al. Effects of Ribbon Thickness on Structure and Soft Magnetic Properties of a High-Cu-Content FeBCuNb Nanocrystalline Alloy. Acta Metall. Sin. (Engl. Lett.) 35, 235–242 (2022). https://doi.org/10.1007/s40195-021-01244-y
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DOI: https://doi.org/10.1007/s40195-021-01244-y