Факультет електроніки та інформаційних технологій (ЕлІТ)
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Item Structural and mechanical characterization of (TiZrNbHfTa)N/WN multilayered nitride coatings(Elsevier, 2018) Багдасарян, Артем Анатолійович; Багдасарян, Артем Анатольевич; Bahdasarian, Artem Anatoliiovych; Pshyk, A.V.; Coy, L.E.; Kempinski, M.; Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Beresnev, V.M.; Jurga, S.The (TiZrNbHfTa)N/WN multicomponent coatings were deposited by vacuum arc evaporation under dif- ferent substrate bias (-90 and -280 V).X-ray photoelectron spectroscopy was used for analyzing of com- plex composition of investigated coatings by reflecting of atomic scale chemical interactions. The structural investigations showed the formation of a simple disordered solid solution in (TiZrNbHfTa)N layer, b-W2N phase in WN layer with fcc crystal structure and highly disordered bcc (110) and (220) -oriented high-entropy alloy phases, regardless of the applied bias potential. It was shown that with increasing of substrate bias from -90 to -280 V, there is a slight decrease of hardness from 34 to 31 GPa and increase of Young’s modulus from 325 to 337 GPa, which can be explained by annihilation of point defects and precipitation of relatively softer metallic phase.Item A new type of (TiZrNbTaHf)N/MoN nanocomposite coating: Microstructure and properties depending on energy of incident ions(Elsevier, 2018) Багдасарян, Артем Анатолійович; Багдасарян, Артем Анатольевич; Bahdasarian, Artem Anatoliiovych; Pshyk, A.V.; Coy, L.E.; Konarski, P; Misnik, M; Ivashchenko, V.I.; Kempinski, M; Mediukh, N.R.; Beresnev, V.M.; Jurga, S; Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr DmytrovychA novel (TiZrNbTaHf)N/MoN nanocomposite coatings, which consist of the nitride of the high-entropy alloy and the binary nitride, were synthesized by vacuum-arc deposition at various substrate biases. The elemental composition, chemical bonding state, phase structure, microstructure and mechanical properties of the coatings were studied by high-resolution experimental methods: SIMS, GDMS, XPS, XRD, HR-TEM and nano-indentation.It was found that the chemical state of the (TiZrNbTaHf)N/MoN coatings has a complex nature, which consist of a mixture of nitrides of constituting elements. It was also shown that the coatings are based on B1 NaCl-structured γ-Mo2N-phase with a mixture of crystallographic orientations (111), (200), (220) and (311) together with the B1NaCl-structured (TiZrNbTaHf)N solid-solution phase. First-principles calculations demonstrated that the metal sub-lattice of the (TiZrNbTaHf)N solid solution can be based on Ti1-xHfyTa1-x-y, Zr1-xHfyTa1-x-y, Zr0.25Ti0.25Ta0.5 ternary alloys, which have the lowest mixing energy. The HR-TEM results showed that the nanocomposite nitride coatings have nano-scale multilayer structure with modulation periods ranged from 20nm to 25nm. The maximum hardness of approximately 29GPa demonstrated the coating deposited at a higher energy condition (−200V) with the thinnest modulation period of bilayer of 20nm (15nm of (TiZrNbTaHf)N and 5nm of Mo2N).Item Microstructure and tribological properties of nitride coatings based on Zr, Ti, Cr, Nb, and Si elements(Beggel House, 2017) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Багдасарян, Артем Анатолійович; Багдасарян, Артем Анатольевич; Bahdasarian, Artem Anatoliiovych; Beresnev, V.M.; Kupchishin, A.I.; Plotnikov, S.V.; Кравченко, Ярослав Олегович; Кравченко, Ярослав Олегович; Kravchenko, Yaroslav OlehovychThe structure and tribological properties of the nitride coatings (Zr–Ti–Nb)N, (Zr–Ti–Cr–Nb)N, and (Zr–Ti-Cr–Nb–Si)N, f abricated by vacuum arc deposition have been investigated. Their ele- mental composition and crystal structure are characterized by EDS and SEM analyses, XPS, and X-ray diffraction. The multicomponent (Zr–Ti–Cr–Nb–Si)N and (Zr–Ti–Nb)N coatings are f ound to be a simple f ace-centered cubic (f cc) solid solution. For the coatings without Si, the struc- ture is mainly composed of the TiN f cc phase and Cr2N trigonal modification. The (Zr–Ti–Nb)N and (Zr–Ti–Cr–Nb)N coatings provided the best adhesive strength in different conditions. The (Zr–Ti–Cr–Nb–Si)N coatings exhibited the worst adhesive strength, which may be attributed to the relative low hardness.Item The effects of Cr and Si additions and deposition conditions on the structure and properties of the (Zr-Ti-Nb)N coatings(Elsevier, 2017) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Багдасарян, Артем Анатолійович; Багдасарян, Артем Анатольевич; Bahdasarian, Artem Anatoliiovych; Кравченко, Ярослав Олегович; Кравченко, Ярослав Олегович; Kravchenko, Yaroslav Olehovych; Beresnev, V.M.; Nyemchenko, U.S.; Ivashchenko, V.I.; Shaimardanov, ZH.K.; Plotnikov, S.V.; Maksakova, O.In this study, (Zr-Ti-Nb)N, (Zr-Ti-Cr-Nb)N and (Zr-Ti-Cr-Nb-Si)N nitride coatings were obtained using a well-developed vacuum arc deposition. The systematical investigations demonstrate that the chemical composition, microstructure, and properties of the coatings intimately rely on the deposition parameters (pressure of working gas and substrate bias). Effects of Cr and Si additions on microstructure and mechanical properties of the (Zr-Ti-Nb)N coatings have been investigated using scanning electron microscopy (SEM) equipped with energy dispersive spectrum (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmission electron microscope (TEM), hardness measurements and adhesion testing. First-principles band-structure calculations and Gibbs-Rosenbaum triangle representation have been used to investigate the elemental and phase compositions in nitride coatings. The multi-component (Zr-Ti-Cr-Nb-Si)N and (Zr-Ti-Nb)N coatings are found to be a simple face-centered cubic (FCC) solid solution. For the coatings without Si, the structure is mainly composed of TiN fcc phase and Cr2N trigonal modification. The hardness values were in the ranges (24–42 GPa). The (Zr-Ti-Nb)N, (Zr-Ti-Cr-Nb)N coatings provided the best adhesive strength in different conditions. The (Zr-Ti-Cr-Nb-Si)N coatings exhibited the worst adhesive strength, which may be attributed to the relative low hardness.Item Adaptive multicomponent nanocomposite coatings in surface engineering(Russian Academy of Sciences, 2017) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Багдасарян, Артем Анатолійович; Багдасарян, Артем Анатольевич; Bahdasarian, Artem Anatoliiovych; Дядюра, Костянтин Олександрович; Дядюра, Константин Александрович; Diadiura, Kostiantyn Oleksandrovych; Pshyk, A.This paper reviews experimental research on nanocomposite coatings of different chemical composition. For adaptive multi-element and multi-layer systems with specific phase composition, structure, substructure, stress state and high functional properties, formation conditions are reviewed; the behavior under extreme conditions and in tribological applications is examined; the structural, phase, and chemical composition, and the hardness, friction and wear at elevated temperatures are discussed; and the adhesive strength of hierarchical protective coatings is analyzed. Finally, the adaptive behavior at different tribological test conditions of multifunctional, multi-layer coatings as a function of their properties and structure is examined.Item Структура и свойства высокоэнтропийных сплавов и нитридных покрытий на их основе(Российская академия наук, Институт органической химии им. Н.Д. Зелинского, 2014) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Багдасарян, Артем Анатолійович; Багдасарян, Артем Анатольевич; Bahdasarian, Artem Anatoliiovych; Якущенко, И.В.; Береснев, В.М.Проанализированы и обобщены результаты исследований закономерностей формирования структуры и свойств высокоэнтропийных сплавов в зависимости от методов их получения. Рассмотрены особенности синтеза нитридных покрытий на основе многокомпонентных сплавов. Проведен сравнительный анализ основных физико-механических характеристик таких покрытий в зависимости от параметров осаждения и элементного сплава.Item Structure and Morphology of Nitride Coating (TiHfZrVNb)N After Thermal Annealing 600˚C(Sumy State University, 2013) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Багдасарян, Артем Анатолійович; Багдасарян, Артем Анатольевич; Bahdasarian, Artem Anatoliiovych; Борисюк, Вадим Миколайович; Борисюк, Вадим Николаевич; Borysiuk, Vadym Mykolaiovych; Partyka, J.This study reports the influence of thermal annealing 600 °C on the characteristics of the (Ti- HfZrVNb)N coatings prepared by vacuum arc melting at different deposition conditions. The crystal structures, surface’s morphology were characterized by X-ray diffraction and atomic force microscopy. The results indicate that nitride coatings based on high-entropy alloy TiHfZrVNb have fcc crystal structure. It is shown that the nitride coatings (TiHfZrVNb)N have a good resistance to oxidation during thermal annealing 600 °C. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35400Item Multifractal analysis of the TiN/Al2O3 coating surface under HCEB modification(Sumy State University, 2012) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Борисюк, Вадим Миколайович; Борисюк, Вадим Николаевич; Borysiuk, Vadym Mykolaiovych; Багдасарян, Артем Анатолійович; Багдасарян, Артем Анатольевич; Bahdasarian, Artem AnatoliiovychNew experimental results are presented on the structure and phase composition of hybrid coatings, which were deposited on a substrate of AISI 321 stainless steel using a combination of plasma-detonation and subsequent High-Current Electron Beam (HCEB) treatment. Modes of processing at which the remelting of the material, which allows to obtain high adhesion of protective layers to the substrate surface are selected. Statistical parameters are calculated within two dimensional multifractal detrended fluctuation analysis. It is shown that the generalized Hurst exponent of the surface under modification is determined by a beam current. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/34902Item Numerical analysis of the morphological and phase changes in the TiN/Al2O3 coating under high current electron beam modification(Thomson, 2013) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Борисюк, Вадим Миколайович; Борисюк, Вадим Николаевич; Borysiuk, Vadym Mykolaiovych; Багдасарян, Артем Анатолійович; Багдасарян, Артем Анатольевич; Bahdasarian, Artem AnatoliiovychПроаналізовано процес модифікації структури поверхнi гiбридного покриття TiN/Al2O3 пiд впливом низькоенергетичного сильнострумового електронного пучка. Шорсткiсть поверхнi розглянуто як функцiю струму пучка. Поверхнi отриманих зразкiв дослiджувались за допомогою двовимiрного мультифрактального флуктуацiйного аналiзу. Для кiлькiсного аналiзу змiни шорсткостi розрахована функцiя мультифрактального спектру. Показано, що зi збiльшенням енергії пучка поверхня стає бiльш регулярною та рiвномiрною. При цитуванні документа, використовуйте посилання http://essuir.sumdu.edu.ua/handle/123456789/33940