Перегляд за Автор "Malykhin, S. V."
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Документ Alloying and modification of materials relevant to fusion and fission energy(Publications Office of the European Union, 2017) Makhlai, V. A.; Garkusha, I. E.; Byrka, O. V.; Taran, V. S.; Herashchenko, S. S.; Malykhin, S. V.Документ Alloying and modification of stainless steels by powerful plasma streams(2016) Makhlaj, V. A.; Aksenov, N. N.; Byrka, O. V.; Chunadra, A. G.; Herashchenko, S. S.; Malykhin, S. V.; Mikhailov, I. F.; Sereda, K. N.; Surovitskiy, S. V.The stainless steel surfaces coated of tungsten have been alloyed and modified with powerful QSPA Kh-50 plasma streams. The plasma streams exposures result in modification of steel-based materials and formation of re-solidified layers. The changes of substrate texture were also registered. Phase characterized by body-centered cubic lattice appeared due to recrystallization of affected material. Thus, the favorable conditions were created for penetration of tungsten into the stainless steel bulk. Growth of lattice parameter was observed as result of plasma irradiation of coated samples. It's indication of tungsten penetration into the depth of substrates.Документ Alloying and modification of stainless steels by powerful plasma streams(Національний науковий центр "Харківський фізико-технічний інститут", 2016) Makhlaj, V. A.; Aksenov, N. N.; Byrka, O. V.; Chunadra, A. G.; Herashchenko, S. S.; Malykhin, S. V.; Mikhailov, I. F.; Sereda, K. N.; Surovitskiy, S. V.; Garkusha, I. E.Документ Behavior of the Ti-Zr-Ni thin film containing quasicrystalline and approximant phases under radiative-thermal action in transition modes(Kharkiv Institute of Physics and Technology, 2020) Malykhin, S. V.; Makhlai, V. A.; Surovitskiy, S. V.; Garkusha, I. E.; Herashchenko, S. S.; Kondratenko, V. V.; Kopylets, I. A.; Zubarev, Evgeniy N.; Borisova, S. S.; Fedchenko, A. V.X-ray diffraction and SEM microscopy were used to study the structural and phase changes in a thin film obtained by magnetron sputtering of a Ti52Zr30Ni18 target (at.%) on a steel substrate under the radiation-thermal influence of pulsed hydrogen plasma on an QSPA Kh-50 accelerator. A technique has been worked out for the formation of the quasicrystalline and crystal-approximant phases as a result of high-speed quenching using pulsed action with a heat load of 0.6 MJ/m². The changes in the contents of these phases as well as in their structure and substructure parameters were studied during isothermal vacuum annealing at a temperature of 550 °C and also as a result of irradiation with 5 plasma pulses in the range of heat load from 0.1 to 0.4 MJ/m². The quasicrystalline phase was found to be resistant to irradiation with hydrogen plasma.Документ Damage features of tungsten and tungsten coatings exposed to QSPA powerful plasma streams in ITER-like conditions(Pontificia Università Urbaniana, Italy, 2016) Makhlai, V. A.; Aksenov, N. N.; Byrka, O. V.; Garkusha, I. E.; Herashchenko, S. S.; Linke, J.; Malykhin, S. V.; Surovitskiy, S. V.; Taran, V. S.; Wirtz, M.Документ Damage of plasma-facing materials exposed to powerful plasma streams in ITER-relevant conditions(Київський національний університет ім. Тараса Шевченка, 2016) Makhlai, V. A.; Aksenov, N. N.; Byrka, O. V.; Garkusha, I. E.; Herashchenko, S. S.; Malykhin, S. V.The damage of tungsten (W) which is chosen as main plasma facing material relevant to International Thermonuclear Experimental Reactor (ITER) have been studied in experimental simulations of ITER-like transient events with quasi-stationary plasma accelerator QSPA Kh-50. Heat loads to exposed surfaces achieved 1 MJ/m2 (the pulse duration of 0.25 ms). The large and fine cracks appeared in result of plasma impacts. Heat loads accompanied by pronounced melting of tungsten cause an intense ejection of liquid droplets and solid dust. Re-deposition of the eroded material is observed also. The most important erosion mechanism connected with the edge effects in 3D geometry of targets has been studied. Such mechanism results in an increase in the size of the emitted droplets as compared with those emitted from a flat surface.Документ Damaging of tungsten and tungsten–tantalum alloy exposed in ITER ELM-like conditions(Elsevier Inc., 2016) Makhlai, V. A.; Garkusha, I. E.; Linke, J.; Malykhin, S. V.; Aksenov, N. N.; Byrka, O. V.; Herashchenko, S. S.; Surovitskiy, S. V.; Wirtz, M.The damage of deformed double forged pure tungsten (W) and tungsten alloyed with 5 wt% tantalum (WTa5) have been studied in experimental simulations of ITER-like transient events with relevant surface heat load parameters (energy density up to 0.75 MJ/m 2 and the pulse duration of 0.25 ms) as well as particle loads (varied in wide range from 10 23 to 10 27 ion/m 2 s) with quasi-stationary plasma accelera- tor QSPA Kh-50. The plasma exposures were performed for the targets maintained at room temperature and preheated at 200 °C. The surface heat loads were either with no melting of W surface or above the melting threshold. The development of surface morphology of the exposed targets as well as cracking and swelling at the surface is discussed. Surface analysis was carried out with an optical microscopy and SEM. Surface modification and development of cracks led to increases of roughness of exposed surfaces. X-ray diffraction (XRD) has been used to study the micro-structural evolution of the exposed targets. The micro deformations of W and WTa5 are similar for targets exposed under similar conditions. The contri- bution of excess complexes of interstitial atoms in the formation of cracks after plasma irradiation was evaluated.Документ Erosion features of tungsten surfaces under combined steady-state and transient plasma loads(Національний науковий центр "Харківський фізико-технічний інститут", 2016) Herashchenko, S. S.; Makhlaj, V. A.; Girka, O. I.; Aksenov, N. N.; Bizyukov, I. A.; Malykhin, S. V.; Surovitskiy, S. V.; Sereda, K. N.; Bizyukov, A. A.The paper presents the experimental research on damage of the tungsten surfaces under combined plasma exposures. Steady-state hydrogen exposures (particle flux of 2×10²² mˉ² sˉ¹, heat flux of 1.7 MW/m², fluence of 10²⁶ mˉ², average ion energy of 2 keV) were provided by FALCON ion source. The pulsed plasma loads below the tungsten melting threshold (hydrogen plasma streams with surface heat load of 0.45 MJ/m² and the pulse duration of 0.25 ms) were performed by means of QSPA Kh-50 device. The behavior of structure, sub- structure and stress-state of tungsten samples have been studied after each cycle of pulsed and steady-state plasma loads.Документ Erosion features of tungsten surfaces under combined steady-state and transient plasma loads(Національний науковий центр "Харківський фізико-технічний інститут", 2016) Herashchenko, S. S.; Aksenov, N. N.; Bizyukov, I.; Girka, O.; Makhlaj, V. A.; Malykhin, S. V.; Surovitskiy, S. V.; Bizyukov, A.; Garkusha, I. E.Документ Erosion properties of tungsten and WTa5 alloy exposed to repetitive QSPA plasma loads below melting threshold(Kharkiv Institute of Physics and Technology, 2018) Makhlai, V. A.; Herashchenko, S. S.; Aksenov, N. N.; Byrka, O. V.; Garkusha, I. E.; Malykhin, S. V.; Surovitskiy, S. V.; Kulik, N. V.; Staltsov, V. V.; Lebedev, S. I.; Shevchuk, P. B.; Wirtz, M.; Sadowski, M. J.The damage of deformed double forged pure tungsten (W) and tungsten alloyed with 5 wt.% tantalum (WTa5) have been studied in experimental simulations of ITER-like transient events (surface heat load of 0.45 MJ/m² and the pulse duration of 0.25 ms) with quasi-stationary plasma accelerator QSPA Kh-50. The plasma exposures were performed for targets maintained at room temperature and preheated at 200 or 300°C. The large and fine cracks appeared in result of plasma impacts. The high number of repetitive plasma loads below the melting threshold led to the clear degradation of thermo-mechanical properties of the affected surface layers on tungsten. Comparative analysis of the cracks propagation to the bulk is presented for both W and WTa5 samples.Документ Erosion properties of tungsten and WTa5 alloy exposed to repetitive QSPA plasma loads below melting threshold(Національний науковий центр "Харківський фізико-технічний інститут", 2018) Makhlai, V. A.; Aksenov, N. N.; Byrka, O. V.; Garkusha, I. E.; Herashchenko, S. S.; Malykhin, S. V.; Surovitskiy, S. V.; Wirtz, M.; Sadowski, M. J.Документ Features of surface modification of copper-based alloys under powerful plasma exposures(Kharkiv Institute of Physics and Technology, 2018) Byrka, O. V.; Aksenov, N. N.; Chunadra, A.; Fomina, L.; Herashchenko, S. S.; Makhlai, V. A.; Malykhin, S. V.; Sereda, K.; Surovitskiy, S. V.; Garkusha, I. E.Paper presents features of plasma alloying of Cu-based materials with Ti-Cr, Ti-Cr-Ti-Nb, Ti-Cr-Ti-Zr, Ti-Cr-Ti-ZrO coatings in different regimes of the QSPA Kh-50. Targets were made from copper samples covered of multilayer PVD coatings have been deposited within a Bulat-type facility. Prepared targets were irradiated with powerful plasma streams with energy loads achieved 0.6 MJ/m² and the pulse duration of 0.25 ms. Influence of plasma impacts on modification different copper alloys has been analyzed. Mechanisms of modification of thin multilayered coatings mixed with Сu substrate in a liquid phase under the plasma processing are evaluated.Документ Features of surface modification of copper-based alloys under powerful plasma exposures(Національний науковий центр "Харківський фізико-технічний інститут", 2018) Byrka, O. V.; Aksenov, N. N.; Chunadra, A.; Herashchenko, S. S.; Makhlai, V. A.; Malykhin, S. V.; Sereda, K.; Surovitskiy, S. V.; Garkusha, I. E.Документ Features of the initial stage of the formation of Ti-Zr-Ni quasicrystalline thin films(Sumy State University, 2020) Malykhin, S. V.; Kondratenko, V. V.; Kopylets, I. А.; Surovitskiy, S. V.; Shipkova, I. G.; Mikhailov, I. F.; Zubarev, Evgeniy N.; Bogdanov, Yu. S.Using the methods of X-ray diffraction, transmission and scanning microscopy, the features of the initial stage of the formation of the quasicrystalline phase in thin films of Ti-Zr-Ni are studied. The films were obtained by magnetron sputtering of a target of the composition Ti₄₁Zr₃₈.₃Ni₂₀,₇ (at. %) with deposition on substrates at T = 300 K and further vacuum annealing. It was established that immediately after deposition, the films are X-ray amorphous, nanostructured. An analysis of the radial distribution functions shows that immediately after deposition, the structural state of a disordered cluster, which is topologically close to icosahedral, prevails in the near atomic medium. It is concluded that the atoms are not arranged randomly, but form a "transitional" structure with an imperfect order like three shells of the Bergman cluster stacking using icosahedrons and dodecahedrons. Such a structure is a "prepared" nucleus for the further formation of the icosahedral phase upon heating. An analysis of the annealing results suggests that the qualitative nature of the transition from the pseudo-amorphous to the quasicrystalline phase and the scale of the transformations are determined by the annealing time and temperature, as well as by the film thickness. The smaller the thickness, the more the annealing processes are inhibited. It was shown that by annealing the films of a thickness of 6 μm or more at 500 °C for more than 28 h, single-phase quasicrystalline coatings with a quasicrystallinity parameter aq of about 0.5245 nm can be obtained.Документ Materials in conditions of high power plasma loads: surface damage and modification(Taras Shevchenko National University of Kyiv, 2018) Makhlai, V. A.; Aksenov, N. N.; Byrka, O. V.; Garkusha, I. E.; Chunadra, A. G.; Herashchenko, S. S.; Malykhin, S. V.; Sereda, K.; Surovitskiy, S. V.The paper discusses main features of material response to the repetitive powerful plasma impacts caused either the damage mechanisms and erosion behaviour or modification of surface layer and alloying with plasma species, aimed at improvement of material performance. Influence of powerful plasma impacts on several materials used for the construction of energy systems, i.e. steels as well as tungsten coatings, and pure tungsten has been discussed.Документ Materials surface damage and modification under high power plasma exposures(2018) Garkusha, I. E.; Makhlaj, V. A.; Byrka, O. V.; Taran, V. S.; Voitsenya, V.; Malykhin, S. V.; Herashchenko, S. S.; Surovitskiy, S. V.; Nowakowska-Langier, K.; Sadowski, M. J.; Skladnik-Sadowska, E.; Terentyev, D.Influence of powerful plasma impacts on several materials used for the construction of energy systems, i.e. different grades of steels as well as tungsten coatings, has been discussed. Irradiations of these materials with hydrogen and helium plasma streams have been performed in several high-current-pulse and quasi-stationary plasma accelerators which provided the variation of a power load upon the exposed surface as well as changes of the particle flux in wide ranges: the energy flux density in the range of 1-25 MJ/m2, particle flux - up to 1026-1029 ion/m2s, the plasma stream velocity - up to about 500 km/s, and the pulse duration in the range of 1-250 μs. A response of the investigated materials to extreme plasma loads, which are relevant to transient events in fusion reactors, is briefly discussed. It is demonstrated that a broad combination of mechanisms of powerful plasma interactions with various materials includes not only a surface damage caused by different erosion mechanisms, but under certain conditions it may also result in a significant improvement of material properties in the nearsurface surface layer of several tens μm in thickness. Some improvement of the structure and substructure of such a layer may be caused by the high-speed quenching, the shock wave formation and material alloying with plasma- and coating-species. The creation of unique surface structures and a considerable improvement of physical and mechanical properties of different materials can be achieved by the pulsed plasma alloying, i.e. pre-deposited coating modifications and mixing caused by the impacting plasma streams.Документ The methodology for X-ray diffraction investigation of icosahedral quasicrystals substructure(STC "Institute for Single Crystals", 2013) Bazdyreva, S. V.; Fedchuk, N. V.; Malykhin, S. V.; Pugachov, A. T.; Reshetnyak, M. V.; Zubarev, Evgeniy N.Документ Modification, alloying and sputtering tests of Cr18Ni10Ti and EUROFER steels(Institute of Energy and Climate Research - Plasma Physics, 2017) Makhlai, V. A.; Garkusha, I. E.; Taran, V. S.; Voitsenya, V.; Herashchenko, S. S.; Aksenov, N. N.; Byrka, O. V.; Solyakov, D.; Solodovchenko, S.; Malykhin, S. V.; Surovitskiy, S. V.; Terentyev, D.Документ Multilayer tungsten/quasi-crystal Ti-Zr-Ni systems as promising materials for protective elements in a fusion reactor(Ukrainian Nuclear Society National Science Center "Kharkiv Institute of Physics and Technology" NAS of Ukraine, 2024) Malykhin, S. V.; Kopylets, I. A.; Surovitskiy, S. V.; Konotopsky, D. V.; Lytvinyuk, L. E.Документ On application of X-ray approximation method for studying the substructure of sufficiently perfect samples(Institute for Single Crystals, 2017) Malykhin, S. V.; Garkusha, I. E.; Makhlay, V. A.; Surovitsky, S. V.; Reshetnyak, M. V.; Borisova, S. S.The technique of X-ray diffraction investigation of coherence length and micro-strain level using approximation of diffraction line profiles by Gaussian and Cauchy functions as well as by harmonic analysis has been worked out for tungsten samples with quite perfect structure. The importance of right choice of a standard for obtaining the reasonable measurement results has been demonstrated. For the first approximation the possibility to use the spectral line width for calculation of the reflection true (physical) broadening has been shown. The contributions of basic instrumental factors into the reflection geometric broadening were estimated.