Effect of milling on the soft magnetic behavior of nanocrystalline alloy cores

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The variation of soft magnetic properties of nanocrystalline Fe73Si16B7Nb3Cu1 (numbers indicate at.%) alloy powder cores as a function of milling time has been investigated. Amorphous ribbons were pulverized using a hammer mill after crystallization heat treatment at 550 degrees C for 1 h. Ball milling was carried out for the pulverized flake powder at room temperature for up to 36h. The powders were classified into 53-75 mu m and under 45 mu m particles and mixed with a binder for consolidation into a toroidal shape. The consolidated powder was annealed at 450 degrees C for 1 h for stress relief. Results show that the consolidation density of the flake-shaped nanocrystalline, alloy powder increased by 2.5-5% in theoretical density (0.2-0.4 g/cm(3)) by the ball milling process. The density increase is attributed mainly to the morphological change due to the milling, which yields smoothened particle edges. Excess milling induced fracture of particles, resulting in reduced density due to the reappearance of sharp edges. In coarse flake powder the permeability is mainly controlled by the density of the consolidates whereas it is dominated by the size distribution of particles in finer powder. The intrinsic coercivity of the powder was significantly influenced by the residual stress and demagnetization effect arising from the change in morphology. (c) 2006 Elsevier B.V. All rights reserved.
Publisher
Elsevier Science Sa
Issue Date
2007
Language
English
Article Type
Article; Proceedings Paper
Keywords

POWDER

Citation

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.449, pp.426 - 429

ISSN
0921-5093
URI
http://hdl.handle.net/10203/89099
Appears in Collection
MS-Journal Papers(저널논문)
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