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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- ПубликацияОткрытый доступВЛИЯНИЕ 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 МикаэловичСуществующие 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 .
- 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.
- ПубликацияОткрытый доступStructural features of hydrogenated E110opt and E635 tubes(2023) Isaenkova, M. G.; Petrov, M. I.; Kozlov, I. V.; Bogomolova, A. V.; Исаенкова, Маргарита Геннадьевна; Петров, Марк Игоревич; Козлов, Илья Владимирович; Богомолова, Анастасия ВладимировнаThe paper investigates the behavior of the hydride phase in hydrogenated tubes made of Russian zirconium E635 and E110opt alloys. The orientation and fraction of mesoscale hydrides in the alloy matrix have been described by analyzing optical metallographic images using the developed software. Metallographic images were used to assess the predomi-nant orientation of hydrides in the axial section of the tube, as well as the surface density of the hydride phase with an increase in the concentration of hydrogen in tubes made of different alloys. It has been shown that increasing the hydro-gen concentration to 600-700 wppm increases the number of radially oriented hydrides, which is associated with the development of compressive radial stress during the formation of tangentially oriented hydrides at the initial stage. Increasing the hydrogen concentration in E110opt alloy cladding tubes to 600-700 wppm leads to a change in the ori-entation of the a -zirconium basal axes, which results in an increase in the integral textural Rf-parameter and a decrease in the Tf -and Lf-parameters. This change is due to the development of radial compressive stress and is only possible due to the activation of twinning in the grains, the basal axes of which are deflected from the compressive stress at an angle of up to 90 degrees. The results of synchrotron Debye rings and X-ray reflection diffraction analysis revealed patterns of structure and tex-ture formation of zirconium matrix and hydrides with increasing hydrogen concentration in E110opt and E635 tube materials. Twinning by the {101-2}(101-1) and {101-1}(101-2) systems has been detected in the alloy E110opt. It reorients the basal axes at angles of 85o and 57.2o in the direction of compressive stress applied in the radial direction. According to the crystal lattice geometry of the a -phase, this reorientation occurs in the direction deviated from the radial direction by 30 degrees. It has been established that in E635 alloy hydrides with {001}(110) orientation are predominantly formed, but hydrides with additional {110}(011) and {110}(112) orientations are also present in smaller amounts. In the E110opt alloy there are hydrides of {001}(110) and {110}(011) orientations as well as (112) in approximately equal proportions. The presence of hydrides with a (112) partially axial textural component is due to activation in the a -phase of twinning along the {101-2} and {101-1} planes, in which hydrides are formed according to the established orientation relationship (0001)a - Zr and#x2814;and#x2814; {111}and delta; - ZrH1.66.