Effect of Cu additions on the magnetic properties and microstructure of FeCoNbB nanocrystalline alloy |
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| Authors: | F. L. Kong H. Men M. X. Zhang T. C. Liu G. Q. Xie B. L. Shen |
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| Affiliation: | 1. Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
2. Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai, 980-8577, Japan
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| Abstract: | The influence of Cu content and the annealing conditions in the (Fe0.5Co0.5)85?x Nb7B8Cu x (x=0.5, 1.0, 1.5) soft magnetic alloys on the magnetic properties and microstructure were investigated. The additions of Cu lower the primary and secondary crystallization temperatures and the α→γ phase transformation temperature of the FeCoNbB alloys. The (Fe0.5Co0.5)84Nb7B8Cu1 alloy annealed at 873 K for 3.6 ks, in which α-(Fe, Co) nanocrystalline phase with diameter of 5 nm precipitated from the amorphous matrix, shows the best soft magnetic properties. The resulting (Fe0.5Co0.5)84Nb7B8Cu1 nanocrystalline alloy exhibits a high saturation flux density of 1.88 T, low coercivity of 42 A/m, very high Curie temperature of 1240 K, as well as low core loss of 770 W/kg at 10 kHz under maximum magnetization of 1 T. |
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