On the kinetics of crystallization of the free and contact sides of Fe77Ni1Si9B13 amorphous alloy ribbons at low-temperature annealing

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Аннотация

The differences between the kinetics of crystallization of the free and contact sides of the ribbon of the amorphous Fe77Ni1Si9B13 alloy at 400°C were considered. As a result of X-ray phase analysis, it was found that crystals based on α-Fe were formed on the contact side even after annealing for 5 min. In the case of the free side, reflections related to α-Fe crystals could be detected on the free side only after annealing for 30 min. The relative content of the crystalline phase was determined from X-ray diffraction data using the relationship between the integral intensity of the reflection of the analyzed phase and its volume fraction. Possible reasons for the observed differences in crystallization were considered. Crystallization in the near-surface layers of both the contact and free sides of the ribbon was shown to occur in two stages (isotropic growth of existing nuclei at a decreasing rate of crystal nucleation and slow anisotropic growth of already formed crystals). The first stage was satisfactorily described within the framework of the Johnson–Mel–Avrami–Kolmogorov thermodynamic formalism, but for the second stage it was unlawful to apply the kinetic equation.

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Авторлар туралы

М. Konovalov

Scientific Center for Metallurgical Physics and Materials Science of Udmurt Federal Research Center of the Ural Branch RAS

Хат алмасуға жауапты Автор.
Email: maksim.kov@mail.ru
Ресей, Izhevsk

V. Lad’yanov

Scientific Center for Metallurgical Physics and Materials Science of Udmurt Federal Research Center of the Ural Branch RAS

Email: maksim.kov@mail.ru
Ресей, Izhevsk

М. Mokrushina

Scientific Center for Metallurgical Physics and Materials Science of Udmurt Federal Research Center of the Ural Branch RAS

Email: maksim.kov@mail.ru
Ресей, Izhevsk

А. Suslov

Scientific Center for Metallurgical Physics and Materials Science of Udmurt Federal Research Center of the Ural Branch RAS

Email: maksim.kov@mail.ru
Ресей, Izhevsk

А. Shilyaev

Scientific Center for Metallurgical Physics and Materials Science of Udmurt Federal Research Center of the Ural Branch RAS

Email: maksim.kov@mail.ru
Ресей, Izhevsk

S. Tereshkina

Scientific Center for Metallurgical Physics and Materials Science of Udmurt Federal Research Center of the Ural Branch RAS

Email: maksim.kov@mail.ru
Ресей, Izhevsk

V. Ivanov

Scientific Center for Metallurgical Physics and Materials Science of Udmurt Federal Research Center of the Ural Branch RAS

Email: maksim.kov@mail.ru
Ресей, Izhevsk

Әдебиет тізімі

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2. Fig. 1. DSC curve of the initial ribbon of the amorphous alloy Fe77Ni1Si9B13.

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3. Fig. 2. Diffraction patterns of the contact side of Fe77Ni1Si9B13 alloy ribbon samples.

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4. Fig. 3. Diffraction patterns of the free side of Fe77Ni1Si9B13 alloy ribbon samples.

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5. Fig. 4. Crystalline phase content in the contact side (empty histograms) and free side (filled histograms) regions of the Fe77Ni1Si9B13 alloy ribbon as a function of annealing time at 400°C.

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6. Fig. 5. Time dependence of the temperature of different melt layers in contact with the cooling disk during melt spinning: 1 — cooling of the contact side; 2 — cooling of the free side; 3 — intermediate layers.

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7. Fig. 6. Dependencies of ln(–ln(1 — Vcr)) on ln(t) plotted for the contact (1) and free (2) sides of the Fe77Ni1Si9B13 alloy ribbon.

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8. Fig. 7. Analysis of the dependencies of ln(–ln(1 — Vcr)) on ln(t) plotted for the contact (1) and free (2) sides of the Fe77Ni1Si9B13 alloy ribbon.

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9. Fig. 8. Crystallite size in the region of the contact (empty histograms) and free (filled histograms) sides of the Fe77Ni1Si9B13 alloy tape depending on the annealing time at 400°C.

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