Effect of heating rate during primary crystallization on soft magnetic properties of melt-spun Fe-B alloys

Zang, Bowen; Parsons, R.; Onodera, Ko; Kishimoto, H.; Kato, Akira; Liu, Amelia C. Y.; Suzuki, Kiyonori

doi:10.1016/j.scriptamat.2017.01.030

Cited by 85 publications

(32 citation statements)

References 31 publications

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“…Materials annealed at optimal temperature had P 10/50 equal to 0.13-0.25 W/kg, Bs equal to 1.47-1.6 T and Hc equal to 9.71-13.1 A/m. Similar Fe-based alloys were investigated by Zang et al [6]. In a 5 min annealing process with a heating rate 1.7 • C/s the authors have obtained Fe 85.5 B 13 Cu 1.5 and Fe 87 B 13 (at the optimum Ta) Hc values equal to 14.5 A/m and above 25 A/m, respectively.…”

Section: Discussionmentioning

confidence: 57%

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

et al. 2020

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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.

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Section: Discussionmentioning

confidence: 57%

“…By lowering the B content, the crystallization temperatures of α-Fe and Fe 2 B phases separate, which is required for a proper annealing process. Obtaining an amorphous alloy with an amount of B below 13% is almost impossible due to the low content of metalloid [6]. Nowadays Fe-B binary alloys are widely tested in URA processes.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…The formation of the atomic structure and its effect on the properties of metallic glass have been studied by a number of researchers so far [3 -5]. Despite the substantial number of currently known chemical compositions of amorphous metallic glasses [6], the development of new ones [7] and the optimization of the known compositions [8] are still of considerable interest.…”

Section: Introductionmentioning

confidence: 99%

Solid state amorphization in a thin Fe-Si-Mg-O surface film triggered by the reduction of elements from oxides in the temperature range of the α-γ transformation

et al. 2020

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The study of the processes occurring in the surface layer of the MgO coated commercial alloy Fe-3 %Si-0.5 %Cu (grain oriented electrical steel) demonstrated that the amorphous phase in the form of a Fe-based solid solution is formed during continuous heating in the 95 %N 2 + 5 %H 2 atmosphere. For the purposes of this study, the following methods were used: nonambient XRD at 20 -1060°C with heating and cooling at a rate of 0.5 dps, layer-by-layer chemical analysis performed by a glow discharge analyzer, scanning electron microscopy and energy dispersive X-ray spectroscopy. ThermoCalc software was used to calculate the potential phase equilibrium states. The amorphous phase was formed in the α → γ transformation temperature range, when the heating rates were altered in the surface layer of 1 µm initially consisted of a solid α-Fe-based solution with ~1-2 wt.% Si with (MgFe) 2 SiO 4 , (MgFe)O, SiO 2 oxide inclusions. We suppose that (MgFe) 2 SiO 4 oxides are partly reduced by H 2 to Mg 2 Si molecular complexes, which become solid solutions in the temperature range of the metastability of the α-Fe crystal lattice with subsequent amorphization as an alternative to the α → γ transition. The amorphous state is obtained at 920 -960°C and is retained both at subsequent heating (to 1060°C) and cooling (to 20°С), which is super-stable compared to the established metallic glasses. The composition of the amorphous phase can be described by the formula Fe 89.5 Si 6 Mg 4 Cu 0.5 .

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“…Despite the quite a large number of currently known chemical compositions of amorphous metal glasses, interest in developing new ones or optimizing the composition of known ones continues to grow [2][3][4][5][6]. It is important to emphasize that all technologies for producing amorphous materials imply ultrahigh cooling rates, for "freezing" atoms in a metastable structure that does not have a long-range order.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Copper and Manganese on the Amorphization Process in a Thin Fe–Si–Mg–O Film

Yurovskikh¹,

Nikul’chenkov²,

Редикульцев³

et al. 2019

KEG

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Effect of heating rate during primary crystallization on soft magnetic properties of melt-spun Fe-B alloys

Cited by 85 publications

References 31 publications

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

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

Solid state amorphization in a thin Fe-Si-Mg-O surface film triggered by the reduction of elements from oxides in the temperature range of the α-γ transformation

The Effect of Copper and Manganese on the Amorphization Process in a Thin Fe–Si–Mg–O Film

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