Научная группа: Совместная лаборатория с НИИ НПО «ЛУЧ» «Новые материалы для атомной техники» (Кафедра №9 ИЯФиТ)
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Шорников, Дмитрий Павлович
Руководитель научной группы "Лаборатория перспективных технологий создания новых материалов"
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Тенишев, Андрей Вадимович
Руководитель научной группы "Ядерные топливные материалы"
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Термохимическая стабильность модельного нитридного ядерного топлива на основе урана
(НИЯУ МИФИ, 2019) Михальчик, В. В.; Михальчик, Владимир Валерьевич; Тенишев, А. В.
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Особенности взаимодействия топливной композиции уран-молибден - продукты деления с алюминиевой матрицей при наличии барьерных покрытий
(НИЯУ МИФИ, 2010) Шорников, Д. П.; Шорников, Дмитрий Павлович; Баранов, В. Г.
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Influence of the structural state and crystallographic texture of Zr-2.5% Nb alloy samples on the anisotropy of their thermal expansion
(2021) Isaenkova, M. G.; Tenishev, A. V.; Krymskaya, O. A.; Stolbov, S. D.; Mikhal'chik, V. V.; Fesenko, V. A.; Klyukova, K. E.; Исаенкова, Маргарита Геннадьевна; Тенишев, Андрей Вадимович; Крымская, Ольга Александровна; Михальчик, Владимир Валерьевич; Фесенко, Владимир Александрович
Zirconium remains the main structural material for thermal reactors due to the small capture cross section of thermal neutrons. In the period of stricter safety requirements for reactors with a simultaneous increase in operating parameters, predicting the behavior of the material in emergency situations has gained greater urgency. In this work, we measured the temperature dependence of the thermal expansion of samples cut from thick-walled tubes made of Zr-2.5% Nb alloy that were deformed and annealed in different modes. The analysis of the physical processes responsible for the shaping of the material is carried out. It was found that the anisotropic change in the linear dimensions of cubic samples both during heating and cooling is due to a change in the zirconium content in the beta-phase, phase transformations alpha + beta-Zr -> alpha + beta-Nb -> beta -> alpha + beta-Zr, as well as the preferred orientation of the grains of the alpha-phase, characterized by high anisotropy of linear expansion. It is shown that the expansion of the investigated samples upon heating in the alpha -phase is determined exclusively by the integral texture parameters of Kearns, and the coefficients of thermal linear expansion (TLEC) in different directions vary over a wide range from 3.10-6 to 12.10-6 K-1. During cooling at the stage of the reverse phase transformation of the beta-phase into alpha, an increase in the size of the cubic samples in the tangential direction up to 2.3 % and a decrease in the radial direction to 1.3 % are noted, which is associated with the orientation of the alpha-phase grains formed during cooling in the beta -matrix and anisotropy of the TLEC of the alpha-grains. It is shown that the orientation of the alpha-phase grains in the reverse beta -> alpha transformation is determined not only by the orientation of the basal axes in the initial material, but also by the spatial distribution of the prismatic axes relative to the external directions in the tube. Significant size fluctuations in different directions of the samples obtained using the technology of manufacturing channel tubes for CANDU reactors should lead to the development of significant macrostresses both during heating and cooling of the tube. The structural state of the samples deformed or annealed at 400-530 degrees C does not significantly affect the temperature dependence of the TLEC, but is manifested only in some of its features. In this case, completely recrystallized samples, i.e., with a recrystallization texture, in which the 1120 directions are oriented along the tube axis, are characterized by a significantly lower variation in dimensions in different directions in the temperature range 20-1200 degrees C.
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Distribution of impurities in ceramics based on zirconium nitride obtained using the oxidative constructing approach
(2020) Shevtsov, S. V.; Vorkachev, K. G.; Ashmarin, A. A.; Ogarkov, A. I.; Kovalev, I. A.; Shokodko, A. V.; Kochanov, G. P.; Tenishev, A. V.; Kazakova, V. N.; Shornikov, D. P.; Strelnikova, S. S.; Chernyavskii, A. S.; Тенишев, Андрей Вадимович; Шорников, Дмитрий Павлович
© Published under licence by IOP Publishing Ltd.The localization of impurity phases in ceramics created by direct nitridation of zirconium rolled metal was established. For ceramics synthesized at temperatures above the melting point of the metal, the impurity phases are localized along grain boundaries and at macrodefects. In a composite heterostructure of the composition ZrN -(ZrN x/ - solid solution of nitrogen in metal/ZrN x ) - ZrN, impurity phases are predominantly localized in an -solid solution of nitrogen with their subsequent displacement to grain boundaries and macrodefects at the end of the nitridization process.
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Properties of graphite to be used as a material for the T-15MD tokamak plasma-facing elements
(2020) Grashin, S. A.; Arkhipov, I. I.; Puntakov, N. A.; Ayrapetov, A. A.; Begrambekov, L. B.; Grunin, A. V.; Dovganyuk, S. S.; Kaplevskiy, A. S.; Tenishev, A. V.; Пунтаков, Николай Алексеевич; Айрапетов, Алексей Александрович; Беграмбеков, Леон Богданович; Довганюк, Сергей Сергеевич; Тенишев, Андрей Вадимович
© Published under licence by IOP Publishing Ltd.The results of the measurement of physical properties, sputtering yield during irradiation by hydrogen ions and a study of surface morphology modification of graphite to be used for the plasma-facing materials of the T-15MD tokamak are presented in this work.
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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.