Abstract
The effect of relevant factors on the magnetic properties and structures of FeCuNbSiB nanocrystalline alloy in the tensile stress process was investigated. The continuous annealing apparatus was designed to control the tensile stress, annealing temperature, isothermal time, heating rate, and cooling rate. Different levels of relevant factors were performed on the ribbon samples using orthogonal experiments designing and then studied by simple variable controlling. To compare the DC tolerance property, the DC-bias field H0.98 is defined. The results show that during annealing the above relevant factors significantly affects the magnetic property including the DC-bias field and core loss. It is observed that the DC-bias field H0.98 and the unit weight core loss of alloy Pm reach the optimum value in 570 and 590 °C and subsequently deteriorate with the increasing annealing temperature. The DC tolerance property is proportional to the tensile stress and when the tensile stress increasing up to 94 MPa, the DC-bias field H0.98 shows a linear relationship with tensile stress. On the other hand, the DC tolerance property is negligible corresponding to the tensile stress smaller than 94 MPa and conversely, the core loss of alloy decrease significantly. The DC-bias field H0.98 of annealing samples exhibit a comparably stable value in the time range of 90 s to 900 s. In addition, the core loss Pm shows a similarly linear decreasing function with isothermal time from 20 to 900 s. Based on the results, the DC-bias field H0.98 is more than 3500 A/m when the tensile stress exceeds 230 MPa and the unit weight of core loss Pm is about 63 W/kg corresponding to f = 100 kHz and Bm = 300 mT when the isothermal time is 900 s, respectively. Analysis with magneto-optical Kerr microscopy reveals that the width of magnetic domains decreases with an increasing tensile stress and annealing temperature. Besides, when the isothermal time exceed 480 s, the magnetic domain wall shows a transformation from perpendicular to parallel to the direction of magnetization. In addition, the relationship between magnetic properties and relevant factors in the tensile stress process is discussed.
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The datasets used or analysed during the current study are available from the corresponding author on reasonable request.
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Funding
This study was funded by National Key Research and Development Project of China (Grant No. 2016YB0300500).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Yun PAN, Tiancheng LIU, Guangmin LI, Baiyang DAI and Na LV. The first draft of the manuscript was written by Yun PAN and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Pan, Y., Liu, T., Li, G. et al. Direct current tolerant characteristics of FeCuNbSiB nanocrystalline in tensile stress annealing. J Mater Sci: Mater Electron 32, 473–484 (2021). https://doi.org/10.1007/s10854-020-04807-4
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DOI: https://doi.org/10.1007/s10854-020-04807-4