Персона: Новиков, Владимир 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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Владимир Владимирович
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- ПубликацияОткрытый доступРАДИАЦИОННОЕ УПЛОТНЕНИЕ УРАН-ГАДОЛИНИЕВОГО ТОПЛИВА(НИЯУ МИФИ, 2019) Девятк, Ю. Н.; Новиков, В. В.; Хомяков, О. В.; Новиков, Владимир Владимирович; Хомяков, Олег ВладимировичA model of radiation-induced densification of uranium-gadolinium fuel was developed. The fuel is established to be in the brittle state in the volume of uranium-gadolinium fuel pellet containing a burnable neutron absorber under irradiation and in the plastic state out of this volume. The relative change in a pellet volume for uranium-gadolinium fuel is shown to be lower than that for uranium oxide nuclear fuel with the same microstructure.
- ПубликацияТолько метаданныеRegularities of Thermal Expansion of Cladding Tubes and Rods Made of E110opt Alloy within the Temperature Range of 273–1473 K (20–1200°C)(2021) Fedotov, P. V.; Kuznetsov, V. I.; Isaenkova, M. G.; Tenishev, A. V.; Perlovich, Y. A.; Stolbov, S. D.; Mikhalchik, V. V.; Novikov, V. V.; Исаенкова, Маргарита Геннадьевна; Тенишев, Андрей Вадимович; Михальчик, Владимир Валерьевич; Новиков, Владимир Владимирович© 2021, Pleiades Publishing, Ltd.Abstract: The regularities of the thermal expansion of cladding tubes and rods from the E110opt alloy, as well as the anisotropy of their thermal properties in the case of layer-by-layer texture inhomogeneity are studied. The thermal linear expansion coefficients (TLEC) of rods and cladding tubes were measured in the axial, radial and tangential directions during heating and cooling in the temperature range of 293–1473 K (20–1200°C). It is shown that as a result of α → β → α phase transformations in the samples, a stable texture of phase transformations is formed which is preserved during subsequent heating and cooling cycles. Analytical expressions are obtained that describe the temperature dependence of the thermal expansion coefficient in the first cycle of heating products from the E110opt alloy, taking into account possible α → β phase transformations and the resulting α-Zr crystal lattice deformation along the a and c axes. It was established that the presence of layer-by-layer inhomogeneity in the samples leads to the appearance of stresses between layers with different crystallographic textures and, as a result, affects the orientation dependence of phase transformations that are sensitive to the stress state in the material. The results obtained indicate the need to take into account the internal stresses arising in textured anisotropic materials during heating and cooling, and to separate the contributions of thermal expansion and plastic deformation when analyzing data from dilatometric measurements of sample sizes.
- ПубликацияТолько метаданныеIdentification of Relaxation Maxima of Internal Friction in Zr–Nb Alloy after Nitriding, Oxidation in Air, and In Situ Carburization(2022) Anan'in, V. M.; Kalin, B. A.; Novikov, V. V.; Sumarokova, A. V.; Новиков, Владимир Владимирович© 2022, Pleiades Publishing, Ltd.Abstract: Behavior of Zr–1 wt % Nb alloy after oxidation in air, nitriding in an atmosphere of process nitrogen, and in situ carburation in the course of measurements has been analyzed using the internal friction method. In this case, carbon was deposited on specimens as a consequence of thermal decomposition of vapors of diffusion oil. The pressure in the system was about 10–2 Pa. The logarithmic decrement of damped bending oscillations was measured as a function of temperature at the frequency of 2.2–2.4 Hz on specimens in the form of a rectangular plate with the dimensions of 22 × 8 × 0.3 mm. The measurements were carried out at constant heating rate of about 4 K/min from ambient temperature to 700–750°C. The obtained temperature dependences of internal friction were subdivided into partial maxima by means of a specialized program determining the temperature of relaxation maxima and calculating the effective activation energy by the Wert–Marx equation. The spectra of internal friction during consecutive measurements on one specimen changed owing to diffusion redistribution of alloy components. The parameters of relaxation maxima for carbon (153–159 kJ/mol), oxygen (203–207 kJ/mol), and nitrogen (235–238 kJ/mol) in the considered alloy were established as a function of experimental conditions. In addition, grain boundary (GB) impurity maxima due to these impurities were detected. Their activation energies (kJ/mol) were 173–179 for C-GB; 216‒219 for O-GB; and 222–229 for N-GB. The impurity grain boundary maxima related to carbon, oxygen, and nitrogen were observed in each measurement series. The activation energy of grain boundary maxima themselves monotonically decreases from 202.4 to 194.5 kJ/mol in the series with oxidation in air (experiments 711–715) and remains at about 200 kJ/mol in nitrided specimens.