Персона: Козлов, Илья Владимирович
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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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Илья Владимирович
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- 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 метаданныеBrazing of ZTA ceramic with titanium for biomedical application(2024) Fedotov, I.; Ivannikov, А.; Terekhova, S.; Dzhumaev, P.; Kozlov, I.; Klyushin, I.; Sevryukov, O.; Федотов, Иван Владимирович; Иванников, Александр Александрович; Терехова, Софья Михайловна; Джумаев, Павел Сергеевич; Козлов, Илья Владимирович; Клюшин, Иван Игоревич; Севрюков, Олег Николаевич
- ПубликацияТолько метаданныеCorrosion of reduced activation ferritic-martensitic steel – Tungsten brazed joints in liquid lithium(2023) Popov, N.; Bachurina, D.; Bogdanov, R.; Kozlov, I.; Dzhumaev, P.; Sevryukov, O.; Suchkov, A.; Krutikova, O.; Попов, Никита Сергеевич; Козлов, Илья Владимирович; Джумаев, Павел Сергеевич; Севрюков, Олег Николаевич; Сучков, Алексей Николаевич; Крутикова, Ольга Михайловна
- ПубликацияОткрытый доступRegularities of Changes in the Structure of Different Phases of Deformed Zirconium Alloys as a Result of Raising the Annealing Temperature According to Texture Analysis Data(2023) Isaenkova, M.; Krymskaya, O.; Klyukova, K.; Bogomolova, A.; Kozlov, I.; Dzhumaev, P.; Fesenko, V.; Исаенкова, Маргарита Геннадьевна; Крымская, Ольга Александровна; Богомолова, Анастасия Владимировна; Козлов, Илья Владимирович; Джумаев, Павел Сергеевич; Фесенко, Владимир АлександровичBased on the data of synchrotron and electron microscopic studies of deformed and annealed Russian zirconium alloys, the possibility of analyzing the structural-phase state and crystallographic texture of individual phases has been demonstrated. A qualitative and quantitative phase analysis of deformed and annealed tubes made of Zr-Nb-(Sn-Fe-O) alloys was carried out using diffraction patterns obtained with synchrotron radiation. The main О±-Zr phase and the following additional phases: ОІ-Nb, ОІ-Zr, and the Laves phase (intermetallic compound Zr(Nb,Fe)2), were found in the alloys. According to the results of texture analysis of all phases present in the alloy, the mechanisms of plastic deformation, recrystallization, and phase transformations of the main and additional phases were established. It is shown that during plastic deformation of the Zr-1%Nb alloy, a dynamic phase transformation ОІ-Nbв†’О±-Zrв†’ОІ-Zr is observed. It is established that during recrystallization, larger grains of О±-Zr are misoriented relative to the deformed matrix by rotating the prismatic axes around the basal axes by 30В°, while fine grains are improved by polygonization and maintain the orientation of the deformed matrix. Processes for changing the orientation of grains of additional phases as a result of high-temperature annealing are also considered.
- ПубликацияТолько метаданныеSimulated thermal tests of a molybdenum/graphite X-ray target manufactured with a novel Ti-Zr-Nb-Be powder filler metal: an investigation of the brazed joint evolution under operating conditions(2021) Sliva, A.; Svetogorov, R.; Fedotov, I.; Suchkov, A.; Dzhumaev, P.; Kozlov, I.; Sevryukov, O.; Федотов, Иван Владимирович; Сучков, Алексей Николаевич; Джумаев, Павел Сергеевич; Козлов, Илья Владимирович; Севрюков, Олег Николаевич© 2021 The Society of Manufacturing EngineersIn this work, two molybdenum-graphite X-ray targets for computed tomography/angiography devices were manufactured with usage of Ti-40Zr-8.5Nb-1.5Be filler metal and 1400 °C – 20 min brazing mode. To confirm the efficiency of the proposed brazing method, a mechanical test and simulated heating of the anodes were carried out, as well as a study of the evolution of the brazed joint under operating conditions. The brazed joint of the anodes showed stability and maintained integrity after tests. However, it is revealed that the long-term heat treatment of the brazed Mo/graphite joint leads to an increase in the amount of carbides in the seam, and also converts the seam into a refractory state by suppressing the formation of beryllium eutectic, while the cyclic heating mainly affects the recrystallization of the seam phases, leading to phase fragmentation. Shear strength tests after simulated heating show that the failure of the Mo/graphite joint occurs in the graphite element with cracking due to the infiltration of the filler metal into graphite through the open porosity. Infiltrates could provoke the occurrence of stresses during cyclic heating/cooling because of the difference in the CTE of graphite and carbide phases. Nevertheless, the joints remained integrity and showed a minimal strength of 23.4 ± 2.5 MPa (after 20 heating cycles of 350 ↔ 1400 °C) and 26.1 ± 6.4 MPa (after vacuum annealing of 1400 °C – 8 h).