Персона: Рогожкин, Сергей Васильевич
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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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Руководитель научной группы «Атомно-масштабные исследования конденсированных сред»
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Рогожкин
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Сергей Васильевич
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- ПубликацияТолько метаданныеIon Radiation Impact on Microstructure and Mechanical Properties of W-6Re Alloy at 500 degrees C(2020) Nikitin, A. А.; Bobyr, N. P.; Rogozhkin, S. V.; Fedin, P. A.; Никитин, Александр Александрович; Рогожкин, Сергей ВасильевичThe paper reports the results of the ion irradiation impact on a monocrystalline tungsten alloy, W-6Re. This material is considered for use in the design of fusion reactors. Irradiation was carried out in order to simulate radiation effects and analyze the radiation resistance of the fusion reactor material. Specimens were irradiated with 5.6 MeV Fe ions at 500 degrees C up to a maximum damage dose of 8 dpa. Microstructure of W-6Re was analyzed before and after irradiation. It is shown with transmission electron microscopy that the formation of structural defects, dislocation loops with sizes of 2-15 nm and a number density of 1.2 x 10(23) m(-3) occurs as a result of irradiation. Detailed analysis by atomic probe tomography microscope revealed the decomposition of the solid solution with the formation of nanoscale segregations enriched in rhenium by 18 at %. The radiation-induced hardening of the irradiated layer is determined by nanoindentation. The strength increment was 1.6 GPa.
- ПубликацияТолько метаданныеOptimization of Mass Reconstruction Algorithm for Atom Probe Tomography Analysis(2019) Shutov, A. S.; Lukyanchuk, A. A.; Raznitsyn, O. A.; Nikitin, A. A.; Rogozhkin, S. V.; Рогожкин, Сергей Васильевич© 2019, Pleiades Publishing, Ltd.Atom probe tomography (ATP) is a technique that has actively been developed in recent years. This method allows one to investigate three-dimensional distributions of chemical elements in various materials with atomic spatial resolution. The raw APT data reconstruction algorithm uses the geometry of evaporated ion trajectories. However, the basic algorithm uses the approximation of rectilinear trajectories of ions moving from the specimen to the detector. In this study, we present the main approaches to adapting and optimizing the basic APT data reconstruction algorithm concerning the mass reconstruction procedure. Methods for taking into account the nonlinear distortions of ion trajectories due to the wide-angle detection system and other features of ion detection in atom probe tomography are demonstrated. Using a titanium alloy (Ti—5Al—2.7Mo—2Zr), we demonstrate that the consideration of the above effects in the reconstruction of ATP data makes it possible to increase the mass resolution, m/Δm50%, of the main peaks of the mass spectrum to 600 and above. In general, the set of performed procedures allows one to achieve a high accuracy of the positioning of the peaks up to 0.01 amu and ensures a significant (more than tenfold) increase in the mass resolution for mass spectrum peaks that are distant from the main peaks.
- ПубликацияТолько метаданныеEffect of Pulsed Fluxes of Deuterium Ions and Deuterium Plasma on Oxide Dispersion Strengthened Ferritic Steels(2021) Gribkov, V. A.; Demina, E. V.; Demin, A. S.; Maslyaev, S. A.; Rogozhkin, S. V.; Рогожкин, Сергей Васильевич© 2021, Pleiades Publishing, Ltd.Abstract: The effect of high-power pulsed fluxes of deuterium ions and deuterium plasma generated in the Plasma Focus PF-1000U device on oxide dispersion strengthened ferritic steel KP4-ODS (Fe–15 Cr–4 Al–2 W–0.35 Y2O3) was experimentally studied. When the samples were irradiated with two pulses (N = 2), the plasma flux power density was qpl ≈ 108 W/cm2 and that of ion beam qi × 109 W/cm2. At N = 9, qpl ≈ 2 ×108 W/cm2 and qi ≈ 5 × 109 W/cm2. The pulse duration of the plasma beams was τpl ≈ 100 ns and that of the ion beams τi ≈ 50 ns. It was shown that irradiation of the material in the soft mode (N = 2) leads to surface erosion due to evaporation of the material and is accompanied by the surface polishing effect. In this case, there is no significant change in the initial structural phase state of steel; only a small change in the crystal lattice parameters of solid solutions based on iron and chromium is observed. In the hard irradiation mode (N = 9), owing to the high heating of the surface layer, in addition to erosion, the material melts. In the structure of the surface layer of the ODS steel, a chromium-based solid solution disappears and only an iron-based solid solution remains, while the number of second-phase nanoparticles increases. The presence of a liquid phase formed upon exposure to fluxes of deuterium ions and deuterium plasma stimulates the possibility of complete dissolution of small (less than ~20 nm) nanoparticles of Y2O3 oxide and partial dissolution of larger (tens of nanometers) nanoparticles. Enhanced in comparison with the solid phase, the diffusion redistribution of elements in the molten surface layer contributes to the formation of Y2O3 nanoparticles and oxides of other elements that make up the ODS steel (Al2O3, Y–Al–O) upon cooling of the melt.
- ПубликацияТолько метаданныеEffect of annealing temperature on the structure and superelasticity of a (Ni, Cu)-rich TiNiCu alloy(2025) Cao, J.; Shuitcev, A.V.; Li , L.; Rogozhkin, S. V.; Рогожкин, Сергей Васильевич
- ПубликацияТолько метаданныеSimulated Irradiation of 16Cr–4Al–2W–0.3Ti–0.3Y2O3 ODS Steel Promising for Fusion Reactors in Vikhr Plasma Focus Facility(2023) Demina, E. V.; Vinogradova, N. A.; Demin, A. S.; Epifanov, N. A.; Rogozhkin, S. V.; Рогожкин, Сергей Васильевич
- ПубликацияТолько метаданныеNanostructure Evolution of Oxide Dispersion Strengthened Steels under Fe Ion Irradiation at 350°C(2020) Khomich, A. A.; Khoroshilov, V. V.; Kulevoy, T. V.; Fedin, P. A.; Rogozhkin, S. V.; Bogachev, A. А.; Nikitin, A. A.; Zaluzhnyi, A. G.; Рогожкин, Сергей Васильевич; Богачев, Алексей Александрович; Никитин, Александр Александрович; Залужный, Александр Георгиевич© 2020, Pleiades Publishing, Ltd.Abstract: Improved mechanical properties of oxide dispersion strengthened (ODS) steels, the advanced materials for the reactor core, are due to the high density of uniformly distributed nanosized oxide inclusions. Transformation of the nanostructure of ODS steels under irradiation determines their stability during operation in the reactor conditions. In this work, three ODS steels are studied: Eurofer ODS, 10Cr ODS, and KP-3 ODS with different alloying systems. In these steels, the chromium content varies from 9 to 14 at %; such alloying elements as V, Ti, Al, W, and Mn are present in different proportions. The effect of irradiation with iron ions up to 3, 6, and 30 dpa at a temperature of 350°C was studied. The radiation-induced changes were analyzed by transmission electron microscopy and atom probe tomography. Although the sizes of oxide inclusions remained almost without change under irradiation, a decrease in their number density was observed in 10Cr ODS and KP-3 ODS steels, while the number density of oxides in Eurofer ODS steel did not change under the irradiation to 30 dpa. On the whole, the strengthening of the ODS steels due to inclusions during the irradiation to 30 dpa at 350°C changed insignificantly, which indicates their radiation resistance and their low propensity for low-temperature radiation strengthening and embrittlement.
- ПубликацияОткрытый доступСтатистический расчет диаграмм состояния бинарных сплавов с дальнодействующим межатомным взаимодействием(1989) Девятко, Ю. Н.; Рогожкин, С. В.; Рогожкин, Сергей Васильевич
- ПубликацияТолько метаданныеAtom Probe Tomography Data Reconstruction with the Correction on Material Density(2021) Aleev, A. A.; Kirillov, C. E.; Lukyanchuk, A. A.; Shutov, A. S.; Raznitsyn, O. A.; Rogozhkin, S. V.; Лукьянчук, Антон Алексеевич; Шутов, Антон Сергеевич; Разницын, Олег Анатольевич; Рогожкин, Сергей Васильевич© 2021, Pleiades Publishing, Ltd.Abstract: Data collected with an atom probe tomograph allow to reconstruct 3D atom maps of chemical element atoms with high accuracy. Due to the permanent improvement of AP installations, new 3D reconstruction procedures are required. This work proposes an improved approach for atom probe data reconstruction which uses dynamic parameters and a calibration based on the material density.
- ПубликацияТолько метаданныеSegregation of Alloying Elements on Small-Angle Grain Boundaries in Ferritic-Martensitic Steels under Ion Irradiation(2020) Iskandarov, N. A.; Nikitin, A. A.; Khomich, A. A.; Khoroshilov, V. V.; Rogozhkin, S. V.; Potekhin, A. A.; Zaluzhnyi, A. G.; Рогожкин, Сергей Васильевич; Залужный, Александр Георгиевич© 2020, Pleiades Publishing, Ltd.Abstract: Segregation of chemical elements was studied in ferritic-martensitic steels RUSFER-EK-181 and ChS-139—promising structural materials for fast neutron reactor core. To simulate the radiation effects, Fe ions with an energy of 5.6 MeV at temperatures of 250–400°C to damage doses of ~6 dpa and at temperatures of 350–450°C to a damage dose of 30 dpa were used. RUSFER-EK-181 steel was also studied after thermal aging at 450°C for 5000 h. Z-contrast analysis of the irradiated steels revealed the segregation of alloying elements on dislocations at small-angle tilt and mixed grain boundaries. Atom probe tomography of the ion-irradiated ChS-139 steel showed that clusters enriched in Ni, Si, and Mn were formed on the dislocations, including dislocations of small-angle grain boundaries. Clusters enriched in Si were formed on dislocations in the RUSFER-EK-181 steel. In the aged state of RUSFER-EK-181 steel, segregation of Cr, V, Mn, Si, and N was shown at dislocations of the small-angle grain boundary. The calculated misorientation angles of the small-angle grain boundaries were ~1°–3°, and the twist angle of the mixed boundary was ~3°.
- ПубликацияТолько метаданныеSimulation of Ion Paths in the Target Material for the Injection Complex of the BELA Facility(2019) Ziiatdinova, A. V.; Fedin, P. A.; Nikitin, A. A.; Rogozhkin, S. V.; Kulevoy, T. V.; Федин, Петр Алексеевич; Никитин, Александр Александрович; Рогожкин, Сергей Васильевич; Кулевой, Тимур Вячеславович© 2019, Pleiades Publishing, Ltd.To realize the simulation experiments with the use of two ion beams at the injection complex of the BELA accelerator (Based on ECR ion source Linear Accelerator), it is necessary to determine the energy and irradiation angle of the beam of light ions which will be implanted into the region of radiation damage induced by heavy-ion beam. The depth of light-ion implantation is determined by the energy and kind of particles initiating the damage, as well as by their incidence angle. It is supposed that the incidence direction of heavy ions will coincide with the normal to the specimen surface. In our work, the necessary implantation zone for the iron ion beam with an energy of 3.2 MeV is located at depths of 300–800 nm. The simulation of the hydrogen and helium ion paths in the material of the iron target in the energy range from 150 to 600 keV at the angle to the normal from 0° to 65° is performed. The range of energies and irradiation angles for the hydrogen and helium ions are determined for the implantation into the radiation-induced defect-formation zone.