Персона: Сучков, Алексей Николаевич
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Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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Алексей Николаевич
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- ПубликацияТолько метаданныеInvestigation of a brazed joint EK-181/V/W obtained by Cu-Sn and Cu-Ti amorphous foils(2020) Bachurina, D.; Suchkov, A.; Gurova, Y.; Sevryukov, O.; Сучков, Алексей Николаевич; Гурова, Юлия Александровна; Севрюков, Олег Николаевич© Published under licence by IOP Publishing Ltd.The work presents the results of high temperature brazing of reduced activated ferritic martensitic steel EK-181 with pure tungsten, which is essential for DEMO fusion reactor. Vanadium interlayer was used to reduce thermal stresses. Brazing alloys to be used were rapidly quenched into ribbons Cu-12Sn, Cu-20Sn, Cu-12Sn-0,4P for EK-181/V, Cu-50Ti for V/W. Microstructure investigations, mechanical and thermocycling test were carried out.
- ПубликацияТолько метаданныеStability of Zr-based metallic glass structure under high-temperature plasma impact(2020) Cherenda, N.; Uglov, V.; Shymanski, V.; Remnev, G.; Astashynski, V.; Suchkov, A.; Bachurina, D.; Сучков, Алексей Николаевич© 2020 IEEE.Investigation of Zr based metallic glass (11% Ti, 12% Ni, 13% Cu, Zr - balance, wt. %) structure transformations after compression plasma flows impact was the main aim of this work. The energy density absorbed by the surface layer was varied in the range of 4-10 J/cm2 per pulse. Structure, element and phase composition of the surface layer were characterized by the X-ray diffraction analysis, scanning electron microscopy and energy-dispersive X-ray microanalysis. The findings showed that increase of the energy absorbed by the surface layer resulted in decomposition of metallic glass amorphous structure. Formation of disordered clusters was found at the density of energy absorbed by the surface layer 4 J/cm2. Crystalline precipitates in disordered matrix were found at 8 J/cm2. Plasma treatment at 10 J/cm2 led to full crystallization of surface layer. \alpha-\text{Zr}, \ \alpha-\text{Ti}, \ \alpha-\text{Zr}(\text{Ti}), Cu and Ni crystalline phases were found in the surface layer after plasma impact at this energy density.
- ПубликацияТолько метаданныеStudy of Ti-Zr-Nb-Be filler metal interaction with silicon carbide based ceramics during brazing process(2020) Eroshenko, A. A.; Ivannikov, А. A.; Fedotov, I. V.; Suchkov, A. N.; Dzhumaev, P. S.; Sevryukov, O. N.; Иванников, Александр Александрович; Федотов, Иван Владимирович; Сучков, Алексей Николаевич; Джумаев, Павел Сергеевич; Севрюков, Олег Николаевич© Published under licence by IOP Publishing Ltd.This work is devoted to an analysis of the composition of a silicon carbide based ceramic brazed seam as a result of its interaction with rapidly quenched titanium-zirconium-niobium-beryllium filler metal. Structural-phase studies based on EDX and EBSD analysis, mechanical shear tests, and microhardness measurements of brazed joints were carried out. It was shown that titanium, zirconium, and niobium silicides as well as particles of titanium carbosilicides and silicon carbides in the silicon matrix are formed in the brazed seam, probably because of the presence of free silicon in the base material, which leads to increasing joint microhardness and unstable shear strength results.
- ПубликацияТолько метаданныеHigh-temperature brazing of structural elements for the first wall of the DEMO reactor with rapidly hardened tungsten and steel alloys-solders(2019) Bachurina, D. М.; Suchkov, A. N.; Gurova, Y.; Sevryukov, O. N.; Сучков, Алексей Николаевич; Гурова, Юлия Александровна; Севрюков, Олег Николаевич© 2021 Informa UK Limited, trading as Taylor & Francis Group.The work presents the results of high-temperature brazing of reduced activated ferritic martensitic steel EK-181 with pure tungsten, which is essential for DEMO fusion reactor. To reduce thermal stresses, vanadium interlayer was used. Brazing alloys to be used were rapidly quenched into ribbons Cu-28Ti and Cu-28Sn for EK-181/V, Cu-50Ti for V/W. Microstructure investigations, mechanical and thermocycling test were carried out. It is shown that Cu-28Ti is better to use; however, it is necessary to improve the reliability of V/W seam.
- ПубликацияТолько метаданныеJoining tungsten with steel for DEMO: Simultaneous brazing by Cu-Ti amorphous foils and heat treatment(2021) Svetogorov, R.; Bachurina, D.; Suchkov, A.; Gurova, J.; Savelyev, M.; Dzhumaev, P.; Kozlov, I.; Leont'eva-Smirnova, M.; Sevryukov, O.; Сучков, Алексей Николаевич; Гурова, Юлия Александровна; Савельев, Максим Дмитриевич; Джумаев, Павел Сергеевич; Козлов, Илья Владимирович; Леонтьева-Смирнова, Мария Владимировна; Севрюков, Олег Николаевич© 2020Development of a reliable technology to join tungsten with steel is essential for DEMO application; however, it is difficult due to large differences in their physical properties. To solve this problem, high-temperature brazing was carried out. Cu-Ti brazing alloys, which were rapidly solidified into foil, were used together with a compensating vanadium interlayer, so the EK-181 steel/Cu-28Ti/V/Cu-50Ti/W and EK-181/Cu-50Ti/V/Cu-50Ti/W brazed joints were obtained. The microstructures of the seams were investigated by optical microscopy, SEM (EDX, EBSD) and synchrotron XRD. Thermocycling and shear strength tests showed that Cu-28Ti wt. % brazing alloy ensures a firmer joint compared to Cu-50Ti wt. %. The Cu-28Ti wt. % brazing alloy was used to perform high-temperature brazing in the brazing mode equivalent to traditional EK-181 steel heat treatment. It showed that every step of the heat treatment affected the microstructures and the shear strength.
- ПубликацияТолько метаданныеStudy of the microstructure and thermomechanical properties of Mo/graphite joint brazed with Ti–Zr–Nb–Be powder filler metal(2021) Sliva, A.; Svetogorov, R.; Fedotov, I.; Suchkov, A.; Dzhumaev, P.; Kozlov, I.; Bachurina, D.; Sevryukov, O.; Федотов, Иван Владимирович; Сучков, Алексей Николаевич; Джумаев, Павел Сергеевич; Козлов, Илья Владимирович; Севрюков, Олег Николаевич© 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.The aim of this work was to braze molybdenum and graphite with Ti–40Zr–8.5Nb–1.5Be filler metal in order to demonstrate the possibility of its application for X-ray tube target brazing, further to investigate the joint microstructure using energy-dispersive X-ray spectroscopy (EDS), electron backscattered diffraction (EBSD), X-ray diffraction (XRD), and electron microscopy as well as to conduct shear and unbrazing tests. It is shown that the brazed joint consists of matrix from β-(Ti, Mo) solid solution, mixed ZrC and TiC carbide layers at the braze/graphite interface, and beryllides TiBe2 and MoBe2 located at the grain boundaries of β-(Ti, Mo). The presented data made it possible to propose a brazed joint formation mechanism and explain the concentration of beryllides at the grain boundaries during brazing, as well as the mixed carbide layer formation from the side of the graphite. The mechanical tests showed that Mo/graphite brazed joints have a shear strength of at least 28.0 ± 0.9 MPa. However, sample failure occurred through the graphite due to the graphite surface mechanical treatment and the presence of a ductile β-Ti phase in the joint. The evaluation of joint thermal properties was performed using unbrazing tests. The unbrazing temperature was 1882 °C, which was caused by formation of refractory phases during brazing. The microstructure study shows that unbrazing occurs through the β-(Ti, Mo) phase with grain boundaries and beryllides eutectic melting.
- ПубликацияТолько метаданныеSelf-passivating smart tungsten alloys for DEMO: a progress in joining and upscale for a first wall mockup(2021) Bachurina, D.; Tan, X. -Y.; Klein, F.; Suchkov, A.; Litnovsky, A.; Schmitz, J.; Gonzalez-Julian, J.; Bram, M.; Coenen, J. W.; Wu, Y. -C.; Linsmeier, C.; Сучков, Алексей НиколаевичSelf-passivating, so-called smart alloys are under development for a future fusion power plant. These alloys containing tungsten, chromium and yttrium must possess an acceptable plasma performance during a regular plasma operation of a power plant and demonstrate the suppression of non-desirable oxidation of tungsten in case of an accident. The up-scaling of the bulk smart alloys to the reactor-relevant sizes has begun and the first samples with a diameter of 50 mm and thickness of 5 mm became available. The samples feature high relative density of above 99% and good homogeneity. With production of bulk samples, the research program on joining the smart alloy to the structural material was initiated. In a present study, the novel titanium–zirconium–beryllium braze was applied successfully to join the smart alloy to the Rusfer-reduced-activation steel. The braze has survived at least a hundred of cyclic thermal excursions in the range of 300–600 °C without mechanical destruction. © 2021, The Author(s).
- ПубликацияТолько метаданныеDevelopment of rapidly-quenched al-ge-si filler alloys for the joining of stainless steel aisi 304 and aluminum alloy aa6082(2021) Fedorov, V.; Uhlig, T.; Wagner, G.; Ivannikov, А.; Abramov, A.; Penyaz, M.; Bachurina, D.; Suchkov, A.; Morokhov, P.; Sevryukov, O.; Иванников, Александр Александрович; Абрамов, Антон Владиславович; Сучков, Алексей Николаевич; Морохов, Павел Владимирович; Севрюков, Олег Николаевич© 2021 by the authors. Licensee MDPI, Basel, Switzerland.Aluminum alloys based on the Al-Ge-Si system with a germanium content of up to 40 wt.%, promising for the brazing of aluminum alloy AA6082 with the stainless steel AISI 304, were studied. The temperature characteristics and microstructural and mechanical properties of the filler alloys were systematically investigated. Differential scanning calorimetry showed that with an increase in the germanium content from 28.0 to 40.0 wt.%, the liquidus temperature of the filler alloys decreased from 514.8 to 474.3◦ C. X-ray diffraction analysis and electron microscopy data showed that the foil of the filler alloys reveals a homogeneous structure. The ingots of the alloys contain two eutectics, the first of which consists of a solid solution of (Al, Ge) with a solid solution of (Ge, Si), and the second consists of a solid solution of (Al, Ge) with a solid solution based on (Ge). When the content of germanium increases from 28.0 to 40.0 wt.%, a separation of the faceted solid solution particles (Ge, Si) and an increase in their number could be observed. Nanohardness measurements showed that the (Ge, Si) and (Ge) solid solutions had similar nanohardness, with values of 11.6 and 10.2 GPa, respectively. Simultaneously, the Al solid solution and the intermetallic Al7 Ge2 Fe phase exhibited significantly lower nanohardness values of 0.7 and 6.7 GPa, respectively. Brinell hardness measurements showed that the ingots of the filler alloys were sufficiently ductile and had a hardness comparable to that of AA6082, which is used for brazing with AISI 304 stainless steel. The obtained results for the studied ingots and the rapidly quenched foils can be used to predict the forming structure of the seam after brazing and adjusted for diffusion processes occurring between the brazed materials and the studied filler alloys.
- ПубликацияТолько метаданныеBrazing SMART tungsten alloys to RAFM steels by Titanium-Zirconium-Beryllium brazing alloy(2024) Kirillova, V. O.; Popov, N. S.; Gurova, J. A.; Fedotov, I. V.; Suchkov, A. N.; Кириллова, Вероника Олеговна; Попов, Никита Сергеевич; Гурова, Юлия Александровна; Федотов, Иван Владимирович; Сучков, Алексей Николаевич
- ПубликацияТолько метаданныеUNDERSTANDING THE STRUCTURAL PHASE STATE OF BULK AMORPHOUS/CRYSTALLINE ALLOYS OBTAINED FROM Zr35Ti30Be27,5Cu7,5 POWDER(2022) Suchkov, A. N.; Bazdnikina, E. A.; Kazakova, V. N.; Kalin, B. A.; Samokhin, A. V.; Сучков, Алексей Николаевич; Баздникина, Екатерина АлександровнаThe paper describes a method for obtaining Ti-and Zr-base near-eutectic alloys in the form of powders with a high degree of sphericity and a narrow size distribution of powder particles. Thus, a Zr35Ti30Be27,5Сu7,5 alloy powder with a particle sphericity of more than 97% and a particle size distribution of 63–100 μm was produced using the method of plasma spheroidization of fragmented powders obtained by grinding amorphous rapid-quenched strips. The final state of spherical particles has an X-ray amorphous structure, as indicated by a broad halo of scattered intensity typical of amorphous materials. An even distribution of chemical elements across the particle section could be observed. Bulk samples were made using the method of spark plasma sintering and applying varying parameters of temperature and dwelling time. The authors looked at the microstructure and microhardness of the bulk samples and carried out an X-ray phase analysis. The samples were found to have an X-ray amorphous structure during spark plasma sintering in the temperature range of 320 to 340оC. However, at the temperatures of 320–325оC, the resulting samples have a high internal porosity, which cannot be fixed with a pressure rise. The greatest compaction is achieved at the temperatures of 335 to 340оC. By varying the dwelling time, the authors determined the optimal regime for producing bulk amorphous alloys: sintering at 340оC and the pressure of 50 MPa, dwelling for 15 min followed by cooling at the rate of 80оC/min. The samples produced in the above conditions have no visible porosity, and their microhardness is closest to that registered in cast samples. Contributors to this research include O. N. Sevryukov, Associate Professor, Candidate of Technical Sciences; P. V. Morokhov, Lead Engineer; P. S. Dzhu-maev, Associate Professor, Candidate of Technical Sciences; I. V. Kozlov, Engineer; V. V. Mikhalchik, Senior Lecturer, Candidate of Technical Sciences; D. S. Gorbunov, Senior Lab Assistant (National Research Nuclear University MEPhI); A. A. Fadeev, Research Fellow; I. D. Zavertyaev, Junior Researcher (Baikov Institute of Metallurgy and Materials Science at the Russian Academy of Sciences). © 2022, Ore and Metals Publishing house. All rights reserved.