On the usage of underwater plasma and magnetopulse processing of FeSiBNb amorphous alloy ribbons

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Abstract

Using the methods of scanning electron, optical and scanning probe microscopy, the surface structure of unannealed amorphous electrotechnical alloys — foils of the composition Fe73(SiBNb)27 and alloys of the same composition, but with the addition of 1% Cu, obtained by the method of ultra-fast cooling by spraying the melt on a rotating copper drum was studied. On the free surfaces of the foils not adjacent to the rotating drum, microformations, irregularities with “micropoints” with characteristic sizes of less than 0.5 microns were found, which during the operation of electrotechnical products can initiate the presence of electric field gradients on the surface of the foil. The effect of underwater plasma on the studied materials did not lead to a change in their magnetic characteristics. For Fe73(SiBNb)27 foil with the addition of 1% Cu, treated with 10 and 40 pulses of a weak magnetic field (10–100 kA/m) of low frequency (10–20 Hz), magnetic contrast was detected: in phase contrast mode after exposure to 40 pulses of a magnetic field, triangular figures associated with the appearance of closing prismatic domains, the width of the domain walls of which is approximately 1–2 μm, and after exposure to 10 pulses of a magnetic field — a magnetic contrast of a specific shape, which was observed over the entire studied area of the foil. Also, for Fe73(SiBNb)27 foil with the addition of 1% Cu, there was a weak dependence of the specific magnetization on the number of magnetic pulses: an increase in the number of pulses led to a slight decrease in the specific magnetization.

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M. N. Shipko

Lenin Ivanovo State Power Engineering University

Author for correspondence.
Email: michael-1946@mail.ru
Russian Federation, Ivanovo

M. A. Stepovich

Tsiolkovsky Kaluga State University

Email: michael-1946@mail.ru
Russian Federation, Kaluga

A. V. Khlustova

G.A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences

Email: michael-1946@mail.ru
Russian Federation, Ivanovo

N. A. Sirotkin

G.A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences

Email: michael-1946@mail.ru
Russian Federation, Ivanovo

T. P. Kaminskaya

Lomonosov Moscow State University

Email: michael-1946@mail.ru
Russian Federation, Moscow

A. V. Stulov

LLC “Research and Production Complex “Avtopribor”

Email: michael-1946@mail.ru
Russian Federation, Vladimir

E. S. Savchenko

National Research Technological University “MISIS”

Email: michael-1946@mail.ru
Russian Federation, Moscow

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2. Fig. 1. Image of a section of the free surface of a ribbon amorphous Fe–Si–B–Nb alloy obtained using atomic force microscopy: in amplitude contrast mode in three-dimensional (a) and two-dimensional (b) form; in phase contrast mode in two-dimensional form (c).

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3. Fig. 2. Image of a section of the free surface of a ribbon amorphous Fe–Si–B–Nb alloy after exposure to underwater plasma, obtained using atomic force microscopy in amplitude (a) and phase (b) contrast modes.

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4. Fig. 3. MFM image of a section of the free surface of a ribbon amorphous alloy Fe73(SiBNb)27 with the addition of 1% Cu after magnetic pulse treatment with 40 magnetic field pulses, obtained in the amplitude (a) and phase (b) contrast mode.

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5. Fig. 4. MFM image of a section of the free surface of a ribbon amorphous alloy Fe73(SiBNb)27 with the addition of 1% Cu after magnetic pulse treatment with 10 magnetic field pulses, obtained in the amplitude (a) and phase (b) contrast mode.

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