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Open AccessArticle

Influence of Cu Content on Structure and Magnetic Properties in Fe86-xCuxB14 Alloys

1
Lukasiewicz Research Network—Institute of Non-Ferrous Metals, 5 Sowinskiegostr., 44-100 Gliwice, Poland
2
Institute of Metallurgy and Materials Science Polish Academy of Sciences, 25 Reymonta str., 30-059 Krakow, Poland
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(6), 1451; https://doi.org/10.3390/ma13061451
Received: 5 March 2020 / Revised: 19 March 2020 / Accepted: 20 March 2020 / Published: 23 March 2020
(This article belongs to the Special Issue Structure and Properties of Crystalline and Amorphous Alloys)
Influence of Cu content on thermodynamic parameters (configurational entropy, Gibbs free energy of mixing, Gibbs free energy of amorphous phase formation), crystallization kinetics, structure and magnetic properties of Fe86-xCuxB14 (x = 0, 0.4, 0.55, 0.7, 1) alloys is investigated. The chemical composition has been optimized using a thermodynamic approach to obtain a minimum of Gibbs free energy of amorphous phase formation (minimum at 0.55 at.% of Cu). By using differential scanning calorimetry method the crystallization kinetics of amorphous melt-spun ribbons was analyzed. It was found that the average activation energy of α-Fe phase crystallization is in the range from 201.8 to 228.74 kJ/mol for studied samples. In order to obtain the lowest power core loss values, the isothermal annealing process was optimized in the temperature range from 260 °C to 400 °C. Materials annealed at optimal temperature had power core losses at 1 T/50 Hz—0.13–0.25 W/kg, magnetic saturation—1.47–1.6 T and coercivity—9.71–13.1 A/m. These samples were characterized by the amorphous structure with small amount of α-Fe nanocrystallites. The studies of complex permeability allowed to determine a minimum of both permeability values at 0.55 at.% of Cu. At the end of this work a correlation between thermodynamic parameters and kinetics, structure and magnetic properties were described. View Full-Text
Keywords: soft magnetic materials; metallic glass; crystallization; magnetic properties soft magnetic materials; metallic glass; crystallization; magnetic properties
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Warski, T.; Wlodarczyk, P.; Polak, M.; Zackiewicz, P.; Radon, A.; Wojcik, A.; Szlezynger, M.; Kolano-Burian, A.; Hawelek, L. Influence of Cu Content on Structure and Magnetic Properties in Fe86-xCuxB14 Alloys. Materials 2020, 13, 1451.

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