Dilatometric analysis of the process of the nanocrystallization of Fe72.5Cu1Nb2Mo1.5Si14B9 soft magnetic alloy

Цепелев, В. С.; Starodubtsev, Yu. N.; Zelenin, V. A.; Kataev, V. A.; Belozerov, V. Ya.; Konashkov, V. V.

doi:10.1134/s0031918x17060096

Cited by 8 publications

(7 citation statements)

References 15 publications

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“…High or low remanence ratio B r /B 800 distinguishes low-temperature and high-temperature annealing of nanocrystalline soft magnetic alloy. Figure 13 shows the dependences of the relative magnetic susceptibility χ T /χ 300 of a ribbon made of the Fe 72.5 Cu 1 Nb 2 Mo 1.5 Si 14 B 9 alloy on temperature during heating and cooling [65]. The arrows in the figure indicate the Curie points of crystalline phases, which are precipitated during crystallization [66][67][68][69].…”

Section: Nanocrystallizationmentioning

confidence: 99%

“…Heat treatment of a nanocrystalline alloy is accompanied by a change in its dimensions associated with structural transformations. Figure 14 shows the relative change in the length ∆ of a ribbon made of the Fe 72.5 Cu 1 Nb 2 Mo 1.5 Si 14 B 9 alloy as a function of temperature T during heating and cooling [65]. On the heating curve up to a temperature of 720 K, the length of the ribbon grows almost linearly with the coefficient of linear thermal expansion α L = 8 × 10 −6 K −1 .…”

Section: Nanocrystallizationmentioning

confidence: 99%

“…Temperature dependence of the relative magnetic susceptibility χ T /χ 300 of a ribbon made of the Fe 72.5 Cu 1 Nb 2 Mo 1.5 Si 14 B 9 alloy during heating and cooling and the Curie point of crystalline phases. Reproduced with permission from[65].…”

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confidence: 99%

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Nanocrystalline Soft Magnetic Iron-Based Materials from Liquid State to Ready Product

Цепелев

Starodubtsev

2021

Nanomaterials

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The review is devoted to the analysis of physical processes occurring at different stages of production and application of nanocrystalline soft magnetic materials based on Fe–Si–B doped with various chemical elements. The temperature dependences of the kinematic viscosity showed that above a critical temperature, the viscosity of multicomponent melts at the cooling stage does not coincide with the viscosity at the heating stage. Above the critical temperature, the structure of the melt is more homogeneous, the amorphous precursor from such a melt has greater plasticity and enthalpy of crystallization and, after nanocrystallization, the material has a higher permeability. The most effective inhibitor elements are insoluble in α-Fe and form a smoothed peak of heat release during crystallization. On the other hand, the finest nanograins and the highest permeability are achieved at a narrow high-temperature peak of heat release. The cluster magnetic structure of a nanocrystalline material is the cause of magnetic inhomogeneity, which affects the shape of the magnetic hysteresis loop and core losses.

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Section: Nanocrystallizationmentioning

confidence: 99%

Section: Nanocrystallizationmentioning

confidence: 99%

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Nanocrystalline Soft Magnetic Iron-Based Materials from Liquid State to Ready Product

Цепелев

Starodubtsev

2021

Nanomaterials

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“…2 b), что в интервале от 500 до 560°C наблюдается провал кривой с нижним значением при 560°C. Уменьшение толщины ленты связано с формированием более плотной кристаллической упаковки по сравнению с аморфной структурой [3]. Затем при температуре 640°C кривая снова стремится вниз.…”

Section: результаты и обсуждениеunclassified

Phase and structural transformations in a nanocrystalline alloy Fe72.5Cu1Nb2Mo1.5Si14B9

Nikul’chenkov¹,

Yurovskikh²,

Starodubtsev³

et al. 2019

LOM

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The material for investigation was a ribbon with an amorphous structure obtained by the melt spinning technique from a melt of molybdenum-modified Finemet-type high-permeability Fe 72.5 Cu 1 Nb 2 Mo 1.5 Si 14 B 9 alloy. Using the methods of non-ambient X-ray diffraction, calorimetry, and dilatometry, temperature intervals of transformations during the transition of material from the amorphous state to the nanocrystalline one with subsequent recrystallization were determined. Each method was characterized by its own heating rate: 1 K / min for the non-ambient X-ray diffraction, 30 K / min for calorimetry, and 20 K / min for dilatometry. Regardless of the heating rate, phase and structure transformations (crystallization and recrystallization, respectively) were observed sequentially. With decreasing heating rate, the crystallization temperature significantly decreased and the recrystallization temperature slightly decreased. Specific heats of crystallization (386 kJ / mol) and recrystallization (88 kJ / mol) were calculated from calorimetry data. Basing on the results of X-ray diffraction and calorimetric studies, the possibility of using the structural unit model was analyzed to describe the amorphous state. It was supposed that any condensed state of the material (amorphous, nanocrystalline and recrystallized) were distinguished by different sizes of coherent scattering regions (CSRs). The lower estimate of coherent scattering regions size was made from the X-ray diffraction halo width for the amorphous state and (110) diffraction line broadening for polycrystals. The Wigner-Seitz cell (truncated octahedron) containing one atom has been adopted as a structural unit. Specific heats of transformations were compared to the values of energies related to the transitions of atoms from CSR borders to lattice sites. Satisfactory applicability of the structural unit model for the description of the amorphous state was demonstrated.

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“…3,20 On the other hand, different mechanical responses of this type of ribbon are also expected when the ribbon is subjected to a tensile stress applied parallel (longitudinal) and transverse to its length, since the application of a mechanical stress during thermal annealing has been reported to induce magnetic anisotropy with the corresponding modification of the domain structure. [21][22][23] While a few works on the mechanical properties of amorphous ferromagnetic alloys have been performed to date, [24][25][26][27] to our best knowledge, no work has reported on the anisotropy of the mechanical properties and its relation to the GMI properties of Co-rich amorphous ribbons.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Mechanical and Giant Magneto-Impedance Properties of Cobalt-Rich Amorphous Ribbons

Tran

Devkota

Eggers

et al. 2016

Journal of Elec Materi

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A comparative study was performed on the mechanical and giant magnetoimpedance (GMI) properties in the longitudinal and transverse directions of Co 69 Fe 4 Ni 1 Mo 2 B 12 Si 12 amorphous ribbons. Both mechanical and GMI properties were found to be anisotropic. Kerr microscopy shows the presence of a stripe-type domain structure with the magnetic easy axis parallel to the longitudinal direction. The fracture strength, elastic modulus, and fracture toughness in the transverse direction was higher than those in the longitudinal direction. A larger GMI response was achieved in the transverse direction at a frequency range where both the domain wall motion and spin rotation dominantly contributed to the effective permeability and hence the magnetoimpedance. The current study paves the way for designing Co-rich amorphous ribbons as desirable components in electronics such as magnetic sensors.

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Dilatometric analysis of the process of the nanocrystallization of Fe72.5Cu1Nb2Mo1.5Si14B9 soft magnetic alloy

Cited by 8 publications

References 15 publications

Nanocrystalline Soft Magnetic Iron-Based Materials from Liquid State to Ready Product

Nanocrystalline Soft Magnetic Iron-Based Materials from Liquid State to Ready Product

Phase and structural transformations in a nanocrystalline alloy Fe72.5Cu1Nb2Mo1.5Si14B9

Anisotropic Mechanical and Giant Magneto-Impedance Properties of Cobalt-Rich Amorphous Ribbons

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