Abstract
Phosphorus (P) is a cheap and effective element that inhibits grain growth and improves soft magnetic properties in Fe-based nanocrystalline alloys. However, most alloys usually require high P content, leading to problems such as volatilization and oxidation during production process. In this paper, we study and report new findings regarding the effect of P microalloying on the magnetic properties, microstructure and magnetic domain structure of Fe77.8Si10B9−xCu0.6Nb2.6Px (x = 0 and 1) nanocrystalline alloys. The substitution of B by 1 at% P has little influence on the crystallization behavior, saturation magnetic flux density (Bs) and permeability (μ) of the alloy, while effectively reduces the coercivity (Hc) in a wide annealing temperature range. The reduced Hc can be attributed to the low magnetocrystalline anisotropy and wide magnetic domains caused by uniform and fine α-Fe(Si) grains. The mechanism of structural evolution induced by 1 at% P is also been discussed. The P microalloyed nanocrystalline alloy with high Bs of 1.43 T, high μ up to 27,000 at 1 kHz, and low Hc of 1.4 A/m is suitable for magnetic shielding piece of wireless charging.
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Funding
This work was supported by National Key Research and Development Program of China (Grant No. 2016YFB0300500), National Natural Science Foundation of China (Grant No. 51771215 and 51771083), Public Projects of Zhejiang Province (Grant No. LGG20E010003), and Ningbo Major Special Projects of the Plan “Science and Technology Innovation 2025” (Grant No. 2018B10084).
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JL conceived and supervised the study. CW performed the experiments and wrote the first draft. AH and YD improved the manuscript. XZ and JW completed the preliminary experiment.
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Wang, C., Li, J., Zhang, X. et al. Effect of P microalloying on magnetic properties and structure of FeSiBNbCu nanocrystalline alloy. J Mater Sci: Mater Electron 32, 4177–4184 (2021). https://doi.org/10.1007/s10854-020-05159-9
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DOI: https://doi.org/10.1007/s10854-020-05159-9