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Козлов, Илья Владимирович

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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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Козлов

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Илья Владимирович

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ВЛИЯНИЕ ДЕЙТЕРИЯ НА ФАЗОВЫЙ СОСТАВ МАЛОАКТИВИРУЕМОГО ПРИПОЯ TiZr4Be
(НИЯУ МИФИ, 2022) БАЧУРИНА, Д. М.; СУЧКОВ, А. Н.; КОЗЛОВ, И. В.; БОБЫРЬ, Н. П.; ГУРОВА, Ю. А.; ЕФИМОВ, В. С.; КУЛИКОВА, Е. С.; СПИЦИН, А. В.; ГАСПАРЯН, Ю. М.; Козлов, Илья Владимирович; Сучков, Алексей Николаевич; Гаспарян, Юрий Микаэлович
Существующие концептуальные проекты первой стенки и дивертора реактора ДЕМО подразумевают наличие неразъемного соединения вольфрама с малоактивируемой ферритно-мартенситной сталью [1,2]. Из-за разницы коэффициентов теплового расширения (КТР) W и стали их прямое соединение затруднено [3]. Перспективным методом получения такого соединения является высокотемпературная пайка быстрозакаленными ленточными сплавами припоями. Для компенсации различий КТР предлагается использование различных промежуточных слоев (V, Та и др.). К настоящему моменту предложено несколько компенсирующих проставок и припоев для соединения вольфрама со сталью. В подавляющем большинстве работ представлена пайка припоями на основе меди или никеля [4], которые, не удовлетворяют требованию малоактивируемости .
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Regularities 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 Александрович
Based 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.
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Joining 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.
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Advanced structure research methods of amorphous Co69Fe4Cr4Si12B11 microwires with giant magnetoimpedance effect: Part 3 – Cluster growth and crystal nucleation
(2024) Kozlov, I. V.; Elmanov, G. N.; Lukyanchuk, A. A.; Shutov, A. S.; Prikhodko, K. E.; Козлов, Илья Владимирович; Елманов, Геннадий Николаевич; Приходько, Кирилл Евгеньевич
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ТЕКСТУРНЫЙ АНАЛИЗ ЦИРКОНИЕВЫХ СПЛАВОВ ПО ДАННЫМ ДИФРАКЦИИ ОБРАТНО РАССЕЯННЫХ ЭЛЕКТРОНОВ И РЕНТГЕНОВСКОГО ИЗЛУЧЕНИЯ РАЗНОЙ МОЩНОСТИ
(Институт реакторных материалов, 2023) Исаенкова, М. Г; Крымская, О. А.; Клюкова, К. Е.; Петров, М. И.; Богомолова, А. В.; Козлов, И. В.; Джумаев, П. С.; Фесенко, В. А.; Козлов, Илья Владимирович; Исаенкова, Маргарита Геннадьевна; Крымская, Ольга Александровна; Клюкова, Кристина Евгеньевна; Петров, Марк Игоревич; Богомолова, Анастасия Владимировна; Фесенко, Владимир Александрович; Джумаев, Павел Сергеевич
Кристаллографическая текстура определяет анизотропию циркониевых сплавов и является чувствительным индикатором всех процессов, протекающих в материалах при пластической деформации, термообработке и эксплуатации. В настоящее время развитие методов электронной микроскопии, а также дифракции синхротронного излучения позволяют существенно упростить трудоемкую процедуру текстурного анализа с использованием традиционного рентгеновского метода, базирующегося на съемке образца «на отражение». В случае использования рентгеновской дифракции на отражение для расчета и построения функции распределения зерен по ориентациям (ФРО) необходима съемка 3-5 неполных прямых полюсных фигур. Электронномикроскопический метод обратно рассеянных электронов (EBSD-метод) существенно упрощает процедуру построения ФРО путем определения ориентации зерен в каждой точке сканируемой поверхности.
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Deuterium retention in the elements of plasma facing components for the DEMO first wall
(2022) Bobyr, N.; Kulikova, E.; Gasparyan, Y.; Bachurina, D.; Efimov, V.; Gurova, J.; Podolyako, F.; Sergeev, N. S.; Sorokin, I. A.; Suchkov, A.; Kozlov, I.; Spitsyn, A. V.; Гаспарян, Юрий Микаэлович; Ефимов, Виталий Сергеевич; Гурова, Юлия Александровна; Подоляко, Федор Сергеевич; Сергеев, Никита Сергеевич; Сорокин, Иван Александрович; Сучков, Алексей Николаевич; Козлов, Илья Владимирович
© 2022 Elsevier B.V.The fully reduced activation brazing alloy TiZr4Be and a tantalum intermediate layer are considered to be used for joining tungsten (W) to reduced-activation ferritic-martensitic steel (RAFM) for future DEMO reactor application. Deuterium retention in the W-Rusfer joints and separate elements was investigated with the focus on the intermediate brazing layer. The samples were exposed in deuterium gas (p = 1–104 Pa, T = 300–600°C) and plasma discharge (T = 600°C). An acceptable deuterium concentration was observed after gas exposure at the pressure of 1 Pa, that is relevant to operating conditions of future fusion devices, however the brazing alloy and tantalum accumulate a large amount of deuterium in the case of the pressure above 100 Pa that leads to failure of the joint. The D retention after D plasma irradiation was substantial, but nearly independent on the fluence and the thickness of the W layer due to absorption from surrounding D2 gas.
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The evolution of structure and magnetoimpedance characteristics of amorphous Co69Fe4Cr4Si12B11 microwires under heat treatment
(2020) Kutuzov, L. V.; Svetogorov, R. D.; Mashera, V. S.; Gorelikov, E. S.; Kozlov, I. V.; Elmanov, G. N.; Prikhodko, K. E.; Tarasov, B. A.; Mikhalchik, V. V.; Козлов, Илья Владимирович; Елманов, Геннадий Николаевич; Приходько, Кирилл Евгеньевич; Тарасов, Борис Александрович; Михальчик, Владимир Валерьевич
© 2019 Elsevier B.V.Amorphous Co69Fe4Cr4Si12B11 glass-coated microwires after heat treatment in the temperature range of 250–600 °C during 30 min were investigated. Changes of microstructure, phase composition, fracture morphology, and giant magnetoimpedance (GMI) properties were shown. It is confirmed that a significant increase in the GMI effect was possible not only due to the structural relaxation, but also as a result of phase transformations at the temperature close to the onset of crystallization. It is shown that at the very initial stage of the nucleation of Co nanocrystals, a sharp increase in circumferential diagonal GMI component was observed, a further increase in the amount of the crystalline Co phase was accompanied by degradation of this effect. The most significant GMI ratio was obtained for microwires annealed at 430 °C. At 450 °C and above, an irreversible decrease of the GMI ratio took place. It was caused by the formation of Co crystals, decrease in amount and composition change of the amorphous phase during primary and secondary crystallization. At the final stage of the Co crystals segregation the secondary crystallization of the residual amorphous phase occurred with formation of a metastable τ-phase with a Me23B6 type structure. Thermal stability of the τ-phase was analyzed.
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Investigation of microstructure and deuterium retention in the reduced activation tungsten-steel brazed joint
(2023) Gurova, J.; Bachurina, D.; Kozlov, I.; Efimov, V.; Krutikova, O.; Suchkov, A.; Spitsyn, A.; Gasparyan, Y.; Гурова, Юлия Александровна; Козлов, Илья Владимирович; Ефимов, Виталий Сергеевич; Крутикова, Ольга Михайловна; Сучков, Алексей Николаевич; Гаспарян, Юрий Микаэлович
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Advanced structure research methods of amorphous Co69Fe4Cr4Si12B11 microwires with giant magnetoimpedance effect: Part 1 – Crystallization kinetics and crystal growth
(2021) Svetogorov, R. D.; Chernavskii, P. A.; Lukyanchuk, A. A.; Shutov, A. M.; Elmanov, G. N.; Kozlov, I. V.; Irmagambetova, S. M.; Prikhodko, K. E.; Елманов, Геннадий Николаевич; Козлов, Илья Владимирович; Ирмагамбетова, Сауле Муханбетовна; Приходько, Кирилл Евгеньевич
© 2021 Elsevier B.V.The initial stage processes of nucleation and growth of crystalline phases in Co-based amorphous microwires in a glass shell were studied by processing kinetic curves using various theoretical models. The results of X-ray diffraction for research of the microstructure evolution at Synchrotron Radiation Source and High Resolution Transmission Electron Microscopy were considered. The study of the crystallization process kinetics was carried out by a non-conventional method, in particular based on data of sample magnetization changes over time and with temperature at a unique in situ vibromagnetometer. The analysis of the kinetic curves for isothermal and non-isothermal crystallization process led to the similar conclusions and made it possible to establish the values of the Avrami exponent for the initial stage of surface and bulk crystallization, to establish the dimensionality of crystal growth, and to conclude that there was no nucleation in the process of crystal growth. Based on the analysis of kinetic curves by three methods, the activation energy of the primary crystallization process was determined, its high value is associated with the presence of chromium in the alloy, which determines its nanocrystallization. The microstructure and shape of crystals were analyzed.
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Advanced structure research methods of amorphous Co69Fe4Cr4Si12B11 microwires with giant magnetoimpedance effect: Part 2 – Microstructural evolution and electrical resistivity change during DC Joule heating
(2022) Svetogorov, R. D.; Odintsov, V. I.; Petrov, V. G.; Popova, A. V.; Kozlov, I. V.; Elmanov, G. N.; Irmagambetova, S. M.; Prikhodko, K. E.; Козлов, Илья Владимирович; Елманов, Геннадий Николаевич; Ирмагамбетова, Сауле Муханбетовна; Приходько, Кирилл Евгеньевич
© 2022 Elsevier B.V.This Part 2 focuses on the processes of atomic regions ordering of the amorphous material and continues study of the processes occurring in Part 1. The formation of pre-crystals / clusters and nanocrystallization of Co-based amorphous microwires during DC Joule heating were investigated, as well as the influence of these processes on the electrical resistance of the samples and the effect of giant magnetoimpedance (GMI). In this paper we investigated the dependence of the change in the maximum response of the GMI diagonal component at different temperatures and holding times in the DC Joule heating process, and discuss the effect of the ductile-brittle transition on the electrical resistance and the GMI effect. Using high-resolution transmission electron microscopy (HR-TEM) and the inverse Fourier transform technique, it was shown that at long exposure during the DC Joule heating, significantly below the crystallization temperature (~ 400 °C), the formation and growth of pre-crystals / clusters occur in various sizes (1 – 8 nm) and shapes. At the initial stage of crystallization, the microwire has three distinct regions of the clusters and nanocrystals formation (surface, pre-surface, and bulk). Moreover, pre-crystals / clusters growth and further bulk formation of nanocrystals (of 10 nm and more) leads to a sharp drop in the electrical resistance and degradation of the GMI microwire diagonal component response. The approach of controlled long-term holding during the DC Joule heating applied in the study allows for creation of various nanoscale structures in an amorphous matrix and provides an opportunity to grow of a given structure in amorphous alloys.