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Effect of Co Substitution on Crystallization and Magnetic Behavior of Fe85.45-xCoxCu0.55B14 Metallic Glass

Materials, ISSN: 1996-1944, Vol: 13, Issue: 4
2020
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Article Description

The effects of Co for Fe substitution on magnetic properties, thermal stability and crystal structure of Fe85.45-xCoxCu0.55B14 (x = 0, 2.5, 5, 7.5, 10) melt spun amorphous alloys were investigated. The Cu content was firstly optimized to minimize the energy of amorphous phase formation by the use of a thermodynamic approach. The formation of crystalline α-Fe type phase has been described using differential scanning calorimetry, X-ray diffractometry and transmission electron microscopy. The classical heat treatment process (with heating rate 10 °C/min) in vacuum for wound toroidal cores was optimized in the temperature range from 280 to 430 °C in order to obtain the best magnetic properties (magnetic saturation Bs and coercivity Hc obtained from the B(H) dependencies) at 50 Hz frequency. For optimal heat-treated samples, the complex magnetic permeability in the frequencies 10-10 Hz at room temperature was measured. Finally, magnetic core losses were obtained for 1 T/50 Hz and 1.5 T/50 Hz values for samples annealed at T = 310°C. An analysis of transmission electron microscope images and electron diffraction patterns confirmed that high magnetic parameters are related to the coexistence of the amorphous and nanocrystalline phases.

Bibliographic Details

Hawelek, Lukasz; Warski, Tymon; Wlodarczyk, Patryk; Polak, Marcin; Zackiewicz, Przemyslaw; Radon, Adrian; Wojcik, Anna; Kolano-Burian, Aleksandra

MDPI AG

Materials Science; Physics and Astronomy

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