Study of the dynamic of crystallization of an amorphous Fe40Ni40P14B6 ribbon through Johnson-Mehl-Avrami model

Peixoto, E.B.; Mendonça, E.C.; Mercena, S.G.; Jesus, Adilson; Barbosa, C.C.S.; Meneses, C.T.; Duque, Juan G.; Silva, R.A.G.

doi:10.1016/j.jallcom.2017.10.062

Cited by 19 publications

(4 citation statements)

References 21 publications

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“…The maximum rate obtained was determined to be the growth rate of the middle stage at this temperature, so the growth rates of the crystal at three temperatures could be obtained. The apparent activation energy at the middle stage can be calculated by the improved Arrhenius equation as follows:

Ln V_{normalg} = Ln k_{0} + (\frac{- E_{a}}{R}) \frac{1}{T}

where k 0 is a coefficient with the unit of g mol −1 ·min −1 , which is independent of temperature. V g is the crystallization rate in middle stage with the unit of h −1 .…”

Section: Resultsmentioning

confidence: 99%

Crystallization and phase transition of tobermorite synthesized by hydrothermal reaction from dicalcium silicate

Pan

et al. 2020

Int J Applied Ceramic Tech

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In this paper, tobermorite was hydrothermally synthesized from the dicalcium silicate (C 2 S) in sodium silicate solution, and the crystallization and phase transition process were investigated in detail using XRD, Raman spectra, and SEM. The tobermorite is difficult to synthesize when the temperature is lower than 160°C because it gets converted into xonotlite (without Na 2 O) or pectolite (with Na 2 O) when the temperature is higher than 180°C. The crystallization process of tobermorite shows "S" trend with the increase in time, which can be divided into three stages: the nucleation stage, rapid crystal growth stage, and perfect crystal forming stage. During the crystallization, 90% of the crystallization of tobermorite is completed in the stage of rapid crystal growth. Raman spectra and SEM analysis show that with the increase in hydrothermal time, the C 2 S of monomer (Q 0 ) is first converted into the calcium silicate hydrate of sheet (Q 2 and Q 3 ), and then continues to convert into tobermorite of chain (Q 2 ). K E Y W O R D Scalcium silicate, crystallization, hydrothermal, raman spectra, tobermorite

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Ln V_{normalg} = Ln k_{0} + (\frac{- E_{a}}{R}) \frac{1}{T}

where k 0 is a coefficient with the unit of g mol −1 ·min −1 , which is independent of temperature. V g is the crystallization rate in middle stage with the unit of h −1 .…”

Section: Resultsmentioning

confidence: 99%

Crystallization and phase transition of tobermorite synthesized by hydrothermal reaction from dicalcium silicate

Pan

et al. 2020

Int J Applied Ceramic Tech

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“…This phenomenon can be attributed to the fac at lower heating rates, atoms within the amorphous structure have sufficient time sorb energy for motion and diffusion rearrangement leading to crystallization at temperatures. Conversely, higher heating rates result in shorter atomic diffusion an arrangement times within the amorphous phase, thereby pushing the crystallization cess towards higher temperatures [23,24]. In the process of crystallization, the amorphous structure must absorb sufficie ergy to overcome a specific energy barrier known as the activation energy (Ea).…”

Section: Thermal Stabilitymentioning

confidence: 99%

The Effects of Si Substitution with C on the Amorphous Forming Ability, Thermal Stability, and Magnetic Properties of an FeSiBPC Amorphous Alloy

Zhu,

Jiang,

Chen

et al. 2024

Metals

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The industrialization of Fe-based amorphous alloys with high a saturation magnetic flux density (Bs) has been limited so far due to their inadequate amorphous forming ability (AFA). In this study, the effects of substituting Si with C on the AFA, thermal stability, and magnetic properties of Fe82Si6−xB9P3Cx (x = 0–6) alloys were systematically investigated. The experimental results demonstrate that the AFA, thermal stability, and soft magnetic properties can be significantly enhanced by the addition of C. Specifically, at a copper wheel velocity of 40 m/s, the Fe82Si6−xB9P3Cx (x = 2, 3, 4, 5 and 6) alloy ribbons exhibit a fully amorphous structure in the as-spun state. The activation energy required for the α-Fe phase crystallization process in Fe82Si6−xB9P3Cx (x = 0, 2, 4, and 6) alloys is determined to be 326.74, 390.69, 441.06, and 183.87 kJ/mol, respectively. Among all of the compositions studied, the Fe82Si4B9P3C2 alloy exhibits optimized soft magnetic properties, including a low coercivity (Hc) of 1.7 A/m, a high effective permeability (μe) of 10608 (f = 1 kHz), and a relatively high Bs of 1.61 T. These improvements may be attributed to a more homogeneous and optimized magnetic domain structure being achieved through proper C addition. This work holds significant implications for the advancement of Fe-based soft magnetic amorphous alloys with high Bs.

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“…Ms and Hc determines of softness of a material. Annealing procedure, which suggests improvement of Ms and occurring of directional anisotropy by growing remanant (Mr) field, leads to magnetic hardening by increasing Hc are also destroyed of mechanical properties as ductility (Howlader et al, 2017;Jiang et al, 2017;Peixoto et al, 2018). The complex permeability in as quenched and annealed mantellic glass ribbon is discarded in terms of domain wall spinning as affected by the precipitation process and the initial permeability (µi) strongly affected by the presence of an electric due to its heating effect particularly in dynamic nature.…”

Section: Introductionmentioning

confidence: 99%

Growth Effect of Crystallites in Fe82Si8B10 Amorphous Ribbon

Sikder

Nath

Khan³

et al. 2022

J. of Eng. Sci.

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Fe82Si8B10 amorphous ribbon which containing 82% of Fe and 18% of B and Si were prepared using rapid solidification technique. The samples were constantly annealed for 1 hour in the temperature range of 350°C-600°C. X-ray diffraction analysis (XRD) displays a large peak which is the diffusion hallow suggesting the amorphousity in its origin and formation of crystalline phase with the increment of annealing temperature at 450oC. The magnetic ordering of the ribbon is determined as temperature functions by both AC and DC magnetization. At 450°C, the saturation magnetization (Ms) was found 143 emu/gm and with better value of real part of initial permeability at 450°C as well as better relative quality factor (RQF) was observed at the same temperature. The results are explained as due to higher heating rates than this Si diffuse in amorphous and lost the soft magnetic properties. Journal of Engineering Science 13(1), 2022, 1-8

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Study of the dynamic of crystallization of an amorphous Fe40Ni40P14B6 ribbon through Johnson-Mehl-Avrami model

Cited by 19 publications

References 21 publications

Crystallization and phase transition of tobermorite synthesized by hydrothermal reaction from dicalcium silicate

Crystallization and phase transition of tobermorite synthesized by hydrothermal reaction from dicalcium silicate

The Effects of Si Substitution with C on the Amorphous Forming Ability, Thermal Stability, and Magnetic Properties of an FeSiBPC Amorphous Alloy

Growth Effect of Crystallites in Fe82Si8B10 Amorphous Ribbon

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