Metals and Alloys, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Computer Science Applications
13
Scopus Publications
Scopus Publications
Machine Learning Application for Functional Properties Prediction in Magnetic Materials V. A. Milyutin, N. N. Nikulchenkov Physics of Metals and Metallography, 2024 Abstract— Machine learning (ML) has proven to be a powerful tool, significantly speeding up and simplifying the development of new materials while enhancing their functional characteristics. In recent years, there has been an exponential growth in the number of scientific publications exploring the use of ML in materials science. Using this approach, various materials, including magnetic ones, are being actively developed and studied. This article aims to critically review research that applies ML to predict the functional characteristics of soft and hard magnetic materials. The paper is divided into three sections: the first outlines the basic principles and algorithms of machine learning, highlighting its use in addressing practical materials science challenges; the second discusses recent advances in developing magnetic functional alloys using ML; the last section provides a critical analysis of the use of machine learning methods in this area, analyzes its advantages and disadvantages, and gives recommendations for organizing such research.
Glass Film Formation on GOES Surface during High-Temperature Annealing: The Mechanism with Amorphous Phase Formation Mikhail L. Lobanov, Nikolai N. Nikul’chenkov, Vladimir V. Popov, Artem S. Yurovskikh, Mikhail Yu. Veksler, Vladimir I. Pastukhov Nanomaterials, 2022 Ceramic insulation coating (glass film) is an important constituent of grain-oriented electrical steel (GOES) designed for use in transformers. Within the scope of this study, the glass film was obtained by means of interaction between the surface of GOES containing 0.5 wt. % Cu and a heat-resistant MgO coating during annealing up to 1100 °C in the 75%H2 + 25%N2 atmosphere. The structure of glass film was analyzed using X-ray diffraction, glow-discharge optical emission spectroscopy, scanning probe microscopy, scanning electron microscopy, differential scanning calorimetry and thermodynamic calculations. After annealing, the glass film contained the following phases: crystalline (MgFe)2SiO4 and amorphous Fe-based solid solutions. The multi-stage mechanism of the glass film formation on GOES surface during high-temperature annealing was determined.
Crystallographic texture simulation of TMCP D. A. Krivenok, S. V. Danilov, N. N. Nikul’chenkov, M. L. Lobanov Aip Conference Proceedings, 2022 The TMCP crystallographic texture has been simulated. This texture arises as a result of hot austenite rolling and subsequent transformation into conformity with the ORs of Kurdjumov-Sachs. From the possible orientations of ferrite, the orientations arising on the austenite boundaries of CSL Σ3 were.
Determination of Structural Elements Size of the Finemet-type Amorphous Alloy N. Nikul’chenkov, M. Lobanov Procedia Structural Integrity, 2021 The sizes of structure elements were determined based on X-ray diffraction data in conjunction with simulation and scanning electron microscopy of the highest resolution for three states of the Fe72.5Cu1Nb2Mo1.5Si14B9 alloy (amorphous, nanocrystalline, and recrystallized). It is shown that the sizes of the coherent scattering regions and crystallites for the nanocrystalline and recrystallized states have good agreement. It allows us to consider the cluster structure of solid "amorphous" materials as "ultra-nanocrystalline" consisting of crystallites with sizes of several interatomic distances.
Mechanism of solid-state amorphization in the fe-si-cu-mg-o system Solid State Phenomena, 2021
Analysis of the structure of thin amorphizing layers of the Fe-Si-Cu-Mg-O system N. N. Nikul'chenkov, A. B. Loginov, S. V. Danilov, B. A. Loginov Aip Conference Proceedings, 2020 The interaction of a MgO thermostable coating and a Fe-3%Si-0.5%Cu surface occurs during annealing at 1000-1060 °C with the formation of a thin amorphous film. The microstructure of the surface is studied in the craters (0, 1, and 5 µm depth) obtained by vaporization using spectrometer ion etching. A moderate agreement of probe microscopy, X-ray diffraction, and scanning electron microscopy is shown.
A study of steel grain structure after TMCP by orientation microscopy S. V. Danilov, K. B. Maslennikov, N. V. Urtsev, N. N. Nikul’chenkov, M. L. Lobanov Aip Conference Proceedings, 2020 The EBSD method is used to study the grain structure of low-carbon low-alloy pipe steel sheets processed by controlled thermomechanical processing (TMCP). It is shown that changing the parameters in the mathematical apparatus of the device software for orientation microscopy leads to obtaining significantly different basic characteristics of the grain structure of the material, which are the misorientation angle for intercrystalline boundary detection and the minimum size of crystals taken into account. The orientation microscopy allows us to identify areas with homogenous crystallographic texture, with evaluating their morphology and size, which are the sites of brittle crack propagation in the process of steel fracture after TMCP.
Solid-state amorphization in the Fe-Si-Cu-Mg-O system N. N. Nikul'chenkov, P. L. Reznik, M. L. Lobanov Aip Conference Proceedings, 2020 The solid-state amorphization process was observed on Fe–3%Si–0.5%Cu alloy surface coated by MgO. The observation was performed using non-ambient x-ray diffraction analysis during continuous annealing at 600–1060 °C. Also, scanning electron microscopy was used with electron backscatter diffraction and electron microprobe analysis. The mechanism of amorphous phase formation was proposed based on the analysis of reactions between MgO, H2O (gas), H2, SiO2, Fe–3%Si (solid solution). The reactions occur at glass film formation during high-temperature annealing of Fe– 3%Si–0.5%Cu. The hydrogen reduces Mg2Si then it transfers into Fe(Si) solid solution with amorphization.
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 Mikhail Lobanov, Artem Yurovskikh, Pavel Reznik, Nikolai Nikul’chenkov, German Rusakov, Andrey Redikul’tsev Letters on Materials, 2020 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: non-ambient 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 .
Thermo-physical parameters determination of nano-crystalline Fe72.5Cu1Nb2Mo1.5Si14B9 alloy for twisted magnetic cores heat treatment optimization Nikolai N. Nikulchenkov, Konstantin Ye. Cherepanov, Mikhail L. Lobanov Materials Science Forum, 2020 Thermophysical parameters of Finemet-type initially amorphous alloy produced using rapid quenching technique were determined. The temperature intervals of phase and structure changes have been obtained using calorimetry and non-ambient X-ray diffraction methods. The electric resistance data were recalculated to alloy electrical conductivity which it was recalculated to heat conductivity using the Wiedemann–Franz law. Resulting parameters were used for heat processes simulation that occurs in amorphous material of built-up transformer core during annealing in nanocrystallization temperature interval. Heat treatment of different sizes twisted magnetic cores was optimized.
Russian Foundation for Basic Research "Aspiranty", 2020-2022, An Obtaining of the Thermostable Amorphous State Triggered by α-γ-transformation in the Alloys Based on the Fe-Si-Mg System, Co-Investigator
RESEARCH OUTPUTS (PATENTS, SOFTWARE, PUBLICATIONS, PRODUCTS)
Lobanov M. L., Nikul’chenkov N.N., Yurovskikh A.S., Zorina M. A., Veksler M.Y., Amorphous Magnetic Alloy Based on The Iron-Silicon Syatem. Russia. RU2791679. Date of publication: 13.03.2023
