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Academic literature on the topic 'High Entropy Alloy Coatings'
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Dissertations / Theses on the topic "High Entropy Alloy Coatings"
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Aziz, Khan Naveed. "RF Magnetron Sputtered AlCoCrCu0.5FeNi High Entropy Alloy (HEA) and High Entropy Ceramic (HEC) Thin Films." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/24615.
Full textAbstract:
High entropy-based materials in the form of thin films have been of growing interest recently for surface engineering applications due to their exceptional properties including high hardness, superior resistance to oxidation and corrosion, improved thermal stability, and high hydrophobicity. Sputter deposition of thin films comprised of several elements typically requires the use of targets containing multiple elements, making both the chemical composition and microstructure of the resulting films strongly dependent on the process parameters. Therefore, this thesis investigates the growth mechanism, composition variation and key physical properties of AlCoCrCu0.5FeNi high entropy alloy (HEA) and high entropy ceramic (HEC) thin films deposited by radio frequency (RF) magnetron sputtering using advanced characterization methods. The depositions were performed using a single stoichiometric AlCoCrCu0.5FeNi HEA target in non-reactive and reactive modes to explore various high entropy-based materials in the form of metallic HEA and ceramic HEC thin films.
This dissertation explores several key deposition parameters during the thin film growth for the AlCoCrCu0.5FeNi HEA system. The initial studies investigate the deposition of HEA thin films in non-reactive mode using argon only and explored the influence of working pressure and deposition power on the microstructure, composition and physical properties. Subsequent chapters report reactive sputtering deposition with various gas flow fractions (RN) using a combination of argon with nitrogen or argon with oxygen to fabricate ceramic thin films of high entropy nitride (HEN) and high entropy oxide (HEO), respectively. The overall findings elucidate that the modification of deposition conditions could be used to control and tune microstructures and chemical composition which regulate the physical properties of the AlCoCrCu0.5FeNi high entropy-based thin films having important implications for the development of surface protective coatings in the aerospace, energy and nuclear industries.
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Löbel, Martin, Thomas Lindner, Thomas Mehner, and Thomas Lampke. "Microstructure and Wear Resistance of AlCoCrFeNiTi High-Entropy Alloy Coatings Produced by HVOF." Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-230210.
Full textAbstract:
The investigation of high-entropy alloys (HEAs) has revealed many promising properties. HEAs with a high share of Al and Ti are suitable for the formation of lightweight materials. Investigations of the alloy system AlCoCrFeNiTi showed high strength, hardness, ductility, and wear resistance, which makes this special alloy interesting for surface engineering and particularly for thermal spray technology. In this study, the suitability of inert gas-atomised HEA powder for high-velocity-oxygen-fuel (HVOF) thermal spray is investigated. This process allows for high particle velocities and comparatively low process temperatures, resulting in dense coatings with a low oxidation. The microstructure and phase composition of the atomised powder and the HVOF coating were investigated, as well as the wear behaviour under various conditions. A multiphase microstructure was revealed for the powder and coating, whereas a chemically ordered bcc phase occurred as the main phase. The thermal spray process resulted in a slightly changed lattice parameter of the main phase and an additional phase. In comparison with a hard chrome-plated sample, an increase in wear resistance was achieved. Furthermore, no brittle behaviour occurred under abrasive load in the scratch test. The investigation of wear tracks showed only minor cracking and spallation under maximum load.
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Belous, V. A., S. A. Firstov, V. F. Gorban, et al. "Properties of Coatings Deposited from Filtered Vacuum Arc Plasma with HEA Cathode." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35323.
Full textAbstract:
Ti-V-Zr-Nb-Hf metallic and nitride films were deposited by filtered vacuum arc plasma from a single
equiatomic HEA cathode. The composition, microstructure, mechanical properties, thermal stability and
corrosion properties were investigated.
The deposited metallic film has a two-phase structure with bcc and hcp-lattice. The nitride films were
found to have only an fcc structure. All coatings have nano-grained structures, with grain sizes 5 nm for
metallic and 36 nm for nitride. The nitride coatings have a compressive stress of around – 12,5 GPa, high
hardness ~ 40 GPa and elastic modulus ~ 450 GPa. After annealing in vacuum in range 400-1200 °C, 3 h
for every temperature, hardness decreased to 25 GPa. It was found that both the metallic and nitride coatings
exhibited their best corrosion resistance than steel samples in a 3,5 wt. % NaCl solution. The metallic
coatings showed better corrosion resistance than the nitride coatings.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35323
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Sobol, O. V., A. A. Andreev, and V. Gorban. "Structural-Strained State and Mechanical Characteristics of Single-Phase Vacuum-Arc Coatings of Multicomponent High Entropy System Ti-V-Zr-Nb-Hf and Nitrides Based On It." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/34808.
Full textAbstract:
In this work was shown the high stability of the single-phase structural state of high entropy alloy of
Ti-V-Zr-Nb-Hf system in a vacuum-arc method of obtaining of coatings based on it. In the process of deposition
single-phase high entropy coatings with bcc-lattice which characterizes the cast state are formed in
vacuum, and upon obtaining in a nitrogen atmosphere single-phase nitride superhard coatings based
on fcc-metal lattice are formed. Such a stability of structure of multi-element alloy to high temperature
evaporation and deposition from high-energy plasma flows allows to use the techniques developed for
simple substitution phases in the analysis of their structural-stress state.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/34808
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Steneteg, Jakob. "Corrosion Resistant Multi-Component Coatings for Hydrogen Fuel Cells." Thesis, Linköpings universitet, Tunnfilmsfysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-174617.
Full textAbstract:
Multi-component coatings and high entropy alloys have in recent years attracted great interest for research, since they have shown to exhibit properties greater than the com- ponents of their parts. Today’s climate challenges requires transitioning from fossil fuels to renewable energy sources which demands use of new technology and new innovations. The hydrogen fuel cell is a technology which produces no carbon emissions, and the drive for innovation has led researchers to apply multi-component (high entropy alloys) coatings to invent the next generation hydrogen fuel cells and help the transition to renewable energy sources. This thesis has investigated the process-structure-property relationships of four deposi- tion growth parameters: target current (Itarget), argon pressure (PAr). substrate bias (Vsubstrate) and deposition time (tdeposition) on TiNbZrTa-coatings, grown by magnetron sputtering using an industrial deposition system. The range of the parameters have been: Itarget from 2.5 to 6 A, PAr from 1 to 17 mTorr, Vsubstrate from 30 to 200 V and tdeposition from 3.6 to 12 minutes (depending on Itarget). Coatings have been grown on Si (001) and stainless steel 304 and 316L substrates. The coating microstructure was analyzed by X-ray diffraction and electron microscopy. The results have yielded that all coatings are equimolar and that the coatings exhibit three different morphologies, two different topologies and two different corresponding structures. The different morphologies are wave, coarse columnar and fine columnar morphology. The two topologies are nodular and dune surface topology. The two different structures are a solid solution BCC (110) phase and an amorphous or nanocrystalline phase. The results indicate that parameters affecting the temperature of the substrate (Tsubstrate) is the prime decider for the final morphology of the coatings. High Itarget and Vsubstrate, low PAr and long tdeposition all increases Tsubstrate and results in a coating which exhibits a fine columnar morphology, dune topology and a solid solution BCC phase. These types of coatings have also proven to have improved corrosion resistance compared to the other type of coatings seen in this thesis. The other kind of coating is grown with low Itarget and Vsubstrate, high PAr and short tdeposition, which causes minimal increase of Tsubstrate. These growth parameters result in a coating with coarse columnar morphology, nodular topology and amorphous or nanocrystalline phase, with less corrosion resistance.<br>FunMat II
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Тевосян, А. А. "Боридні покриття на основі високоентропійних сплавів". Master's thesis, Сумський державний університет, 2019. http://essuir.sumdu.edu.ua/handle/123456789/73025.
Full textAbstract:
Об’єкт дослідження – боридні покриття на основі високоентропійних сплавів та фізико-хімічні процеси, що обумовлюють формування та зміну фазового складу, структури і функціональних властивостей покриттів.
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Ляшко, В. О. "Карбідні покриття на основі високоентропійних сплавів". Master's thesis, Сумський державний університет, 2019. http://essuir.sumdu.edu.ua/handle/123456789/73026.
Full textAbstract:
В роботі досліджені карбідні покриття на основі високоентропійних сплавів та фізико-хімічні процеси, що обумовлюють формування та зміну фазового складу, структури і функціональних властивостей покриттів.
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Huser, Gautier. "Etude et sélection d’alliages à composition complexe sans cobalt à finalité tribologique." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST051.
Full textAbstract:
Il est nécessaire de développer des revêtements sans cobalt possédant une bonne résistance à l’usure afin de remplacer les alliages de type stellite® qui sont utilisés dans les centrales nucléaires. En effet, les débris de cet alliage sont activés sous flux neutronique et forme du 60Co, un isotope radioactif susceptible de contaminer le reste de l’installation. Les matériaux sans cobalt, base nickel ou base fer, proposés pour le moment ne présentent pas des propriétés tribologiques concurrentes à celles du stellite®. Les AHE (Alliage à Haute Entropie) et ACC (Alliage à Composition Complexe) peuvent être de bons candidats. En effet, ces alliages possèdent des domaines de compositions particulièrement étendus par rapport aux alliages conventionnels, qui donnent alors accès à un vaste espace de propriétés, en particulier mécaniques. Dans un premier temps, l’étude de plusieurs ACC par la méthode CALPHAD (CALculation of PHAse Diagram) a été réalisée afin de déterminer des compositions favorisant la présence de phases intermétalliques dures bénéfiques au comportement tribologiques. Le travail s’est poursuivi par la réalisation de plusieurs séries d’alliages. Des caractérisations microstructurales et tribologiques ont permis de retenir une unique composition comme meilleure candidate potentielle au remplacement des alliages base cobalt. Cette composition a alors été élaborée sous forme de poudre puis de revêtement en utilisant les procédés de DLD (Direct Laser Deposition) et compression isostatique à chaud. Leur microstructure et leur comportement tribologique a été comparé à celui du stellite®<br>Currently, attempts are made to develop hardfacing cobalt-free alloys for coating the contact areas of moving parts of nuclear installations. In fact, under neutron flux, cobalt 59 is activated into cobalt 60, a highly radioactive isotope. Consequently, the coating debris generated by friction are likely to contaminate parts of the installation. Existing cobalt-free hardfacing alloys, nickel or iron bases, do not exhibit tribological properties competing with those of stellite®, a commonly used hardfacing cobalt base alloy. HEA (High Entropy Alloy) and CCA (Complex Concentration Alloy) may be good candidates. Indeed, compare to conventional alloys, they show vast composition domain giving access to a large range of properties. After an initial selection of elements, the phases of selected alloys were calculated by CALPHAD software (CALculation of PHAse Diagram). The compositions favoring the presence of hard intermetallic phases beneficial to tribological behavior were selected. Then several alloys were fabricated using different processes. From microstructural and tribological characterizations, one composition has been selected as the best potential cobalt-free hardfacing alloy candidate. Coatings of this composition were then fabricated by DLD (Direct Laser Deposition) and HIP (Hot Isostatic Pressing). Their microstructure and tribological behavior were measured and compared to those of stellite ®
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Сухонос, Я. В. "Мікроструктура та фізико-механічні властивості боридних багатокомпонентних покриттів". Master's thesis, Сумський державний університет, 2019. http://essuir.sumdu.edu.ua/handle/123456789/76755.
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В роботі представлено результати дослідження мікроструктури та фізико-механічних властивостей багатокомпонентних боридних покриттів на основі високоентропійних сплавів, які отримані різними методами осадження. Проаналізовані результати вивчення структурно-фазового стану і властивостей покриттів залежно від експериментальних умов і параметрів нанесення покриттів. Дослідження в роботі великої кількості покриттів ( залежно від тиску робочого газу та потенціалу зсуву підкладки) дозволило встановити закономірності формування структурного стану таких покриттів, виявити кореляцію між фазовим складом і фізико-механічними властивостями.
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Kushnerov, O. I. "MD simulation of AlCoCuFeNi high-entropy alloy nanoparticle." Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/45791.
Full textAbstract:
High entropy alloys (HEA) are metallic compounds containing from 5 to 13 metallic elements in equiatomic ratios. In HEAs, because of the high mixing entropy, formation of brittle intermetallic phases is usually avoided and simple solid solutions are rather stabilized (BCC and/or FCC). This study used molecular dynamics (MD) package LAMMPS to simulate the AlCoCuFeNi nanoparticle (NP) crystallization.