Effect of surface crystallization on magnetic properties of Fe82Cu1Si4B11.5Nb1.5 nanocrystalline alloy ribbons

•Ribbons with surface crystallization show a larger annealing temperature range.•Proper surface crystallization will decrease the P from 0.27W/kg to 0.20W/kg.•The crystallization process was driven by the diffusion and competitive processes. In this study, Fe82Cu1Si4B11.5Nb1.5 nanocrystalline alloy...

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 438; pp. 126 - 131
Main Authors Zhang, Jianhua, Wan, Fangpei, Li, Yecheng, Zheng, Jiecheng, Wang, Anding, Song, Jiancheng, Tian, Muqin, He, Aina, Chang, Chuntao
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.09.2017
Elsevier BV
Subjects
Alloys
Coercivity
Core loss
Crystallization
Diffusion layers
Magnetic anisotropy
Magnetic fields
Magnetic permeability
Magnetic properties
Melt spinning
Melt-spun
Nanocrystalline alloy
Nanocrystals
Niobium
Permeability
Pinning field
Soft magnetic property
Studies
Surface crystallization
Nanocrystalline alloy
Pinning field
Soft magnetic property
Melt-spun
Surface crystallization
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Summary:•Ribbons with surface crystallization show a larger annealing temperature range.•Proper surface crystallization will decrease the P from 0.27W/kg to 0.20W/kg.•The crystallization process was driven by the diffusion and competitive processes. In this study, Fe82Cu1Si4B11.5Nb1.5 nanocrystalline alloy ribbons with completely amorphous structure and surface crystallization were prepared using melt-spinning technique with wheel speeds of 45m/s, 35m/s and 25m/s. The effect of surface crystallization layers on the soft-magnetic properties, core loss and dynamic magnetization process were systematically investigated. Moreover, the permeability-frequency spectra were measured as a function of the AC magnetic field, ranging from 1 to 75A/m. It was found that decreasing the melt-spinning wheel speed can widen the annealing temperature range and the coercivity increases with the increase of surface crystallization. Excessive crystallization layers will increase the pinning field (Hp), which will lead to an increase of magnetic anisotropy constant K and eventually decrease the effective permeability. The crystallization mechanism of the Fe82Cu1Si4B11.5Nb1.5 nanocrystalline alloy ribbons with surface crystallization layers was discussed from the aspects of diffusion and competitive processes, which is helpful for further understanding the nanocrystallization process.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2017.04.086