Relevant bibliographies by topics / High Entropy Alloy Coatings

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Academic literature on the topic 'High Entropy Alloy Coatings'

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Published: 6 September 2023

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Journal articles on the topic "High Entropy Alloy Coatings"

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Sharma, Ashutosh. "High Entropy Alloy Coatings and Technology." Coatings 11, no. 4 (March 24, 2021): 372. http://dx.doi.org/10.3390/coatings11040372.

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Recently, the materials research community has seen a great increase in the development of multicomponent alloys, known as high entropy alloys (HEAs) with extraordinary properties and applications. In surface protection and engineering, diverse applications of HEAs are also being counted to benefit from their attractive performances in various environments. Thermally sprayed HEA coatings have outperformed conventional coating materials and have accelerated further advancement in this field. Therefore, this review article overviews the initial developments and outcomes in the field of HEA coatings. The authors have also categorized these HEA coatings in metallic, ceramic, and composite HEA coatings and discussed various developments in each of the categories in detail. Various fabrication strategies, properties, and important applications of these HEAs are highlighted. Further, various issues and future possibilities in this area for coatings development are recommended.
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Yurov, V. M., S. A. Guchenko, V. I. Goncharenko, and V. S. Oleshko. "High-entropy ZrTiCrNiCu coating." Journal of Physics: Conference Series 2064, no. 1 (November 1, 2021): 012080. http://dx.doi.org/10.1088/1742-6596/2064/1/012080.

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Abstract A magnetron target made of a high-entropy ZrTiCrNiCu alloy was synthesized by mechanical alloying methods followed by annealing in a vacuum furnace. Using this target, coatings were applied to steel samples with a thickness of 7-10 microns. After thermal annealing, the coatings were nanostructured. In terms of microhardness, the ZrTiCrNiCu coating is not inferior to, and in most cases exceeds the hardness of high-entropy equiatomic alloys. A high entropy coating has a low coefficient of friction. They turn out to be anti-friction, which, most likely, leads to energy savings. In this work, the surface energy, contact potential difference and work function of electrons for high-entropy coatings were determined for the first time.
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Cui, Kaixuan, and Yong Zhang. "High-Entropy Alloy Films." Coatings 13, no. 3 (March 17, 2023): 635. http://dx.doi.org/10.3390/coatings13030635.

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High-entropy alloy films have the same excellent properties as high-entropy alloys and can better realize the practical applications of high-entropy alloys. This paper takes the high-entropy alloy films as the object of discussion. The preparation process, microstructure, hardness, wear resistance and corrosion resistance of high-entropy alloy films are mainly discussed and the influence of nitridation, sputtering power, substrate temperature, substrate bias and other factors on the phase structure of alloy films is analyzed. High-entropy alloy films can be prepared using magnetron sputtering, laser cladding, pulsed laser deposition, detonation spraying, electrochemical deposition and other processes. High-entropy alloy films tend to form a solid solution and amorphous state, and their hardness is far higher than that of traditional films. Among them, the hardness of high-entropy alloy nitride films can reach the standard of superhard films. Wear resistance is usually proportional to hardness. Due to the corrosion-resistant elements and amorphous structure, some high-entropy alloy films have better corrosion resistance than stainless steel. High-entropy alloy films have shown profound development prospects in the fields of wear-resistant coatings for tools, corrosion protection, diffusion barrier and photothermal conversion coatings.
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Cai, Zhao Bing, Xue Jia Pang, Xiu Fang Cui, Xin Wen, Zhe Liu, Mei Ling Dong, Yang Li, and Guo Jin. "In Situ Laser Synthesis of High Entropy Alloy Coating on Ti-6Al-4V Alloy: Characterization of Microstructure and Properties." Materials Science Forum 898 (June 2017): 643–50. http://dx.doi.org/10.4028/www.scientific.net/msf.898.643.

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In order to improve the surface properties of Ti-6Al-4V, high-entropy alloy coatings were prepared by in-situ laser cladding on the surface of Ti-6Al-4V substrate. The microstructure, micro-hardness, corrosion resistance and wear resistance were investigated. The results showed that the high-entropy alloy coating was composed of BCC high-entropy alloy phase, α-Ti phase and (Ni, Co)Ti2 phase. The micro-hardness of the high-entropy alloy coatings is much higher than that of Ti-6Al-4V substrate. The coating also has a better corrosion resistance than Ti-6Al-4V substrate, even superior to 304SS in 3.5wt.% NaCl solution at room temperature. Compared with Ti-6Al-4V substrate, the high-entropy alloy coating has a greater wear resistance with the wear mass loss decreased 28.2% and 23.1%, respectively. Wear patterns of Ti-6Al-4V substrate and high-entropy alloy coatings are the coexistence of adhesive wear and abrasive wear, but the wear degree of high-entropy alloy coatings is lower.
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Zhang, Hongling, Wenjuan Li, Huanhuan Xu, Liang Chen, Junshan Zeng, Zhibing Ding, Wenmin Guo, and Bin Liu. "Microstructure and Corrosion Behavior of Laser Cladding FeCoNiCrBSi Based High-Entropy Alloy Coatings." Coatings 12, no. 5 (May 4, 2022): 628. http://dx.doi.org/10.3390/coatings12050628.

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High-entropy amorphous alloys designed based on the concept of multi-principal components have the comprehensive advantages of high passivation element content and amorphous structure, and are considered to be one of the promising alternative protective materials in extreme marine environments. However, based on the composition of traditional amorphous alloys, the multi-principal design significantly reduces the glass forming ability of high-entropy amorphous alloys. Based on the traditional FeCoCrNiBSi high-entropy amorphous alloy, Fe19.6Co19.6Ni19.6Cr19.6(B13.72Si5.88)19.6Y2 high-entropy amorphous alloy was designed by microalloying in this study. The traditional Fe43.6Co6Ni17.4Cr9B17.5Si1.5Nb5 iron-based amorphous alloy was selected as the comparison material. Then, spherical alloy powders were prepared by gas atomization. The amorphous nanocrystalline composite coatings were deposited on the 304 stainless steel by laser cladding technology. The microstructure of the coatings was characterized by scanning electron microscopy and X-ray diffractometer. The corrosion behavior of laser cladding coatings in 3.5 wt.% NaCl solution were investigated in detail. The results show that the Fe43.6Co6Ni17.4Cr9B17.5Si1.5Nb5 powder is composed of FCC, Laves and boride phases. Whereas the Fe19.6Co19.6Ni19.6Cr19.6(B13.72Si5.88)19.6Y2 high-entropy amorphous alloy powder is composed of FCC and boride phases. Due to the remelting and multiple heat treatments during the preparation of the laser cladding coatings, borides were precipitated in both coatings. The microstructure of the two coatings from the bonding area with the substrate to the top layer are plane grains, dendrite, equiaxed grains and amorphous phase, respectively. Fe19.6Co19.6Ni19.6Cr19.6(B13.72Si5.88)19.6Y2 high-entropy amorphous alloy coating exhibits high corrosion potential, passivation film resistance and low corrosion current density in 3.5 wt.% NaCl solution. In addition, the passivation film formed on the coating has higher Cr content and lower defect concentration, showing more excellent corrosion resistance.
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Lin, Cheng, and Yonggang Yao. "Corrosion-Resistant Coating Based on High-Entropy Alloys." Metals 13, no. 2 (January 20, 2023): 205. http://dx.doi.org/10.3390/met13020205.

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Metal corrosion leads to serious resource waste and economic losses, and in severe cases, it can result in catastrophic safety incidents. As a result, proper coatings are often employed to separate metal alloys from the ambient environment and thus prevent or at least slow down corrosion. Among various materials, high-entropy alloy coatings (HEA coating) have recently received a lot of attention due to their unique entropy-stabilized structure, superior physical and chemical properties, and often excellent corrosion resistance. To address the recent developments and remaining issues in HEA coatings, this paper reviews the primary fabrication methods and various elemental compositions in HEA coatings and highlights their effects on corrosion resistance properties. It is found that FeCoCrNi-based and refractory high-entropy alloy coatings prepared by the laser/plasma cladding method typically show better corrosion resistance. It also briefly discusses the future directions toward high-performing corrosion-resistant coatings based on HEA design.
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Ma, Kai, Li Feng, and Zhipeng Wang. "Microstructure and Properties of FeCrMnxAlCu High-Entropy Alloys and Coatings." Coatings 13, no. 8 (August 9, 2023): 1401. http://dx.doi.org/10.3390/coatings13081401.

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FeCrMnxAlCu (x = 0.5, 1, 1.5, and 2) high-entropy alloys (HEA) and coatings were prepared through vacuum arc melting and cold spray-assisted induction remelting processes. This study investigated the effect of different Mn contents on the microstructure and wear resistance of HEAs and coatings. The results showed that the high-entropy FeCrMnxAlCu alloy prepared through vacuum arc melting and cold spray-assisted induction remelting processes comprised simple body-centered cubic and face-centered cubic phases with dendritic + interdendrite structures. The coating of the prepared alloys exhibited superior performance compared with the cast alloy. In addition, the hardness of the FeCrMnxAlCu HEA coatings synthesized through induction remelting was 1.4 times higher than that of the cast FeCrMnxAlCu HEA. Moreover, the wear rate of induction-remelted produced HEA coating was reduced by 24% compared with that of vacuum arc-melted produced HEA. The hardness of the induction-remelted produced FeCrMnxAlCu HEA coating initially increased and then decreased with increasing Mn contents. At x = 1, the hardness of FeCrMnAlCu HEA coating reached a maximum value of 586 HV, with a wear rate of 2.95 × 10−5 mm3/(N·m). The main wear mechanisms observed in the FeCrMnxAlCu HEA coatings were adhesive, abrasive, and oxidative.
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Sfikas, Athanasios K., Spyros Kamnis, Martin C. H. Tse, Katerina A. Christofidou, Sergio Gonzalez, Alexandros E. Karantzalis, and Emmanuel Georgatis. "Microstructural Evaluation of Thermal-Sprayed CoCrFeMnNi0.8V High-Entropy Alloy Coatings." Coatings 13, no. 6 (May 28, 2023): 1004. http://dx.doi.org/10.3390/coatings13061004.

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The aim of this work is to improve the understanding of the effect of the cooling rate on the microstructure of high-entropy alloys, with a focus on high-entropy alloy coatings, by using a combined computational and experimental validation approach. CoCrFeMnNi0.8V coatings were deposited on a steel substrate with high velocity oxy-air-fuel spray with the employment of three different deposition temperatures. The microstructures of the coatings were studied and compared with the microstructure of the equivalent bulk high-entropy alloy fabricated by suction casting and powder fabricated by gas atomization. According to the results, the powder and the coatings deposited by low and medium temperatures consisted of a BCC microstructure. On the other hand, the microstructure of the coating deposited by high temperature was more complex, consisting of different phases, including BCC, FCC and oxides. The phase constitution of the bulk high-entropy alloy included an FCC phase and sigma. This variation in the microstructural outcome was assessed in terms of solidification rate, and the results were compared with Thermo-Calc modelling. The microstructure can be tuned by the employment of rapid solidification techniques such as gas atomization, as well as subsequent processing such as high velocity oxy-air-fuel spray with the use of different spray parameters, leading to a variety of microstructural outcomes. This approach is of high interest for the field of high-entropy alloy coatings.
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Guo, Jing, Chenghao Liu, Dexing Wang, Lingfeng Xu, Kaikai Song, and Ming Gao. "Structure and Wear Resistance of TiC-Reinforced Al1.8CrCuFeNi2 High-Entropy Alloy Coating Using Laser Cladding." Materials 16, no. 9 (April 27, 2023): 3422. http://dx.doi.org/10.3390/ma16093422.

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Al1.8CrCuFeNi2 high-entropy alloy coatings with different TiC contents were prepared using laser cladding. The effect of TiC on the microstructure, hardness and wear resistance of the coatings was investigated. It was found that the phase structure of the coating with 10 wt.% TiC was a single BCC phase with no other precipitated phase. When 20 wt.% TiC was added, the phase structure of the coating was a BCC phase and TiC phase. When the TiC content increased to 30 wt.%, more TiC-reinforcing phase was formed. With the increase in the TiC content, the hardness of the high-entropy alloy coating was enhanced and the wear loss clearly decreased, which was closely related to the change in the coating structure. The addition of TiC to high-entropy alloys plays the role of fine-grain strengthening and dispersion strengthening.
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Dou, D., X. C. Li, Z. Y. Zheng, and J. C. Li. "Coatings of FeAlCoCuNiV high entropy alloy." Surface Engineering 32, no. 10 (March 2, 2016): 766–70. http://dx.doi.org/10.1080/02670844.2016.1148380.

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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.

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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.

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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, A. S. Kuprin, V. D. Ovcharenko, E. N. Reshetnyak, G. N. Tolmachova, and M. G. Kholomeev. "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.

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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.

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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.

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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.
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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.

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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.

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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.

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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®
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.

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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.
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Books on the topic "High Entropy Alloy Coatings"

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Srivatsan, T. S., and Manoj Gupta. High Entropy Alloys: Innovations, Advances, and Applications. Taylor & Francis Group, 2020.

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Srivatsan, T. S., and Manoj Gupta. High Entropy Alloys: Innovations, Advances, and Applications. Taylor & Francis Group, 2020.

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Srivatsan, T. S., and Manoj Gupta. High Entropy Alloys: Innovations, Advances, and Applications. Taylor & Francis Group, 2020.

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Liaw, Peter K., and Y. Y. Shang. Mechanical Behavior of High-Entropy Alloys: Key Topics in Materials Science and Engineering. ASM International, 2022. http://dx.doi.org/10.31399/asm.tb.mbheaktmse.9781627084185.

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Mechanical Behavior of High-Entropy Alloys: Key Topics in Materials Science and Engineering provides an overview of high-entropy alloys (HEAs) and their distinguishing characteristics. It describes their composition and structure, strengthening mechanisms, deformation behaviors, and exceptional fatigue resistance. It discusses the role of alloying elements, the factors that influence microstructure evolution, and the properties that have been achieved with different alloy combinations and treatments. It also discusses fabrication processes and potential applications and includes an informative question-and-answer chapter.
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Hecht, Ulrike, Mark L. Weaver, and Sheng Guo, eds. Dual-phase Materials in the Medium and High Entropy Alloy Systems Al-Cr-Fe-Ni and Al-Co-Cr-Fe-Ni. Frontiers Media SA, 2021. http://dx.doi.org/10.3389/978-2-88971-225-0.

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Book chapters on the topic "High Entropy Alloy Coatings"

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Aliyu, Ahmed, M. Y. Rekha, and Chandan Srivastava. "Electrodeposition of High Entropy Alloy Coatings." In High Entropy Alloys, 313–28. Boca Raton : CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9780367374426-12.

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Mwema, Fredrick Madaraka, Tien-Chien Jen, and Lin Zhu. "High Entropy Alloy Thin Films." In Thin Film Coatings, 257–70. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003202615-13.

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Chen, Yujie, Paul Munroe, Zonghan Xie, and Sam Zhang. "High-Entropy Alloy-Based Coatings." In Protective Thin Coatings Technology, 205–32. New York: CRC Press, 2021. http://dx.doi.org/10.1201/9781003088349-6.

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Yeh, Jien-Wei, Su-Jien Lin, Ming-Hung Tsai, and Shou-Yi Chang. "High-Entropy Coatings." In High-Entropy Alloys, 469–91. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27013-5_14.

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Kumar, Himanshu, S. G. K. Manikandan, M. Kamaraj, and S. Shiva. "Effect of Laser Surface Melting on Atmospheric Plasma Sprayed High-Entropy Alloy Coatings." In Laser-based Technologies for Sustainable Manufacturing, 207–34. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003402398-9.

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Migranov, M. Sh, S. R. Shekhtman, and A. S. Gusev. "Synthesizing Low-Wear Cathodic Coatings from Multi-component Alloys with a High-Entropy Effect." In Lecture Notes in Mechanical Engineering, 718–28. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-38126-3_71.

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Chen, Hsuan-Chu, and Jien-Wei Yeh. "High-Entropy Coatings." In High-Entropy Materials: Theory, Experiments, and Applications, 687–719. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77641-1_13.

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Pogrebnjak, A. D., and A. A. Bagdasaryan. "Interstitial Alloy Structuring of High Entropy Alloys." In High Entropy Alloys, 71–94. Boca Raton : CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9780367374426-3.

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Li, Dong Yue, and Yong Zhang. "High Entropy Alloy Fibers Having High Tensile Strength and Ductility." In High Entropy Alloys, 689–702. Boca Raton : CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9780367374426-23.

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Lebyodkin, Mikhail A., Tatiana A. Lebedkina, Jamieson Brechtl, and Peter K. Liaw. "Serrated Flow in Alloy Systems." In High-Entropy Materials: Theory, Experiments, and Applications, 523–644. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77641-1_11.

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Conference papers on the topic "High Entropy Alloy Coatings"

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Kenyi, A., R. Bhaskaran Nair, and A. McDonald. "Towards Highly Durable High Entropy Alloy (HEA) Coatings Using Flame Spraying." In ITSC2022. DVS Media GmbH, 2022. http://dx.doi.org/10.31399/asm.cp.itsc2022p0827.

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Abstract High entropy alloys (HEAs) constitute a new class of advanced metallic alloys that exhibit exceptional properties due to their unique microstructural characteristics. HEAs contain multiple (five or more) elements in equimolar or nearly equimolar fractions compared to traditional alloy counterparts. Due to their potential benefits, HEAs can be fabricated with thermal spray manufacturing technologies to provide protective coatings for extreme environments. In this study, the AlCoCrFeMoW and AlCoCrFeMoV coatings were successfully developed using flame spraying. The effect of W and V on the HEA coatings were investigated using X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, and micro-hardness testing. Furthermore, performance of the coating under abrasive loading was investigated as per ASTM Standard G65. Microstructural studies showed different oxides with solid-solution phases for all the HEA coatings. Hardness results were higher for the AlCoCrFeMoV coatings followed by AlCoCrFeMoW and AlCoCrFeMo coatings. Lower wear rates were achieved for the AlCoCrFeMoV coatings compared to AlCoCrFeMoW and AlCoCrFeMo coatings. The evolution of multiple oxide phases and underlying microstructural features improved the resistance to abrasive damage for the AlCoCrFeMoV coatings compared to other HEA coatings. These results suggest that the flame-sprayed HEA coatings can be potential candidates for different tribological interfaces while concurrently opening new avenues for HEA coating utilization.
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Bhattacharya, R., O. N. Senkov, A. K. Rai, X. Ma, and P. Ruggiero. "High Entropy Alloy Coatings for Application as Bond Coating for Thermal Barrier Coating Systems." In ITSC 2016, edited by A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen, and C. A. Widener. DVS Media GmbH, 2016. http://dx.doi.org/10.31399/asm.cp.itsc2016p0279.

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Abstract High-entropy alloys (HEAs) are well suited for use in high-temperature environments due to their combination of strength, ductility, thermal stability, and corrosion and wear resistance. In this study, NiCoCrAlSi-based HEA coatings are deposited by HVOF and air plasma spraying (APS) and their phases, microstructure, and composition are evaluated by means of XRD, SEM, and EDS analysis. The results show that BCC/B2 phases are the main constituent in HVOF coatings that were diffusion heat treated. APS coatings of the same composition, on the other hand, exhibited a two-phase structure consisting of L12 and BCC/B2 phases. The HEA coatings produced by HVOF were tested for oxidation resistance and their morphology and oxide scales were examined with the aim of developing a high-quality bond coat for thermal barrier coating (TBC) systems.
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Yin, Shuo, Rocco Lupoi, Wenya Li, Yaxin Xu, Bo Song, Xingchen Yan, and Min Kuang. "Cold-Sprayed FeCoNiCrMn High-Entropy Alloy (HEA) Coating: Microstructure and Tribological Properties." In ITSC2019, edited by F. Azarmi, K. Balani, H. Koivuluoto, Y. Lau, H. Li, K. Shinoda, F. Toma, J. Veilleux, and C. Widener. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.itsc2019p0045.

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Abstract High-entropy alloys are of great interest due to their unique phase structure. They are constructed with five or more principal alloying elements in equimolar or near-equimolar ratios and thus derive their performance from multiple elements rather than one. In this work, solid-state cold spraying is used for the first time to produce a FeCoNiCrMn high-entropy alloy coating. As a low-temperature process, cold spraying completely retained the high-entropy phase structure in the coating without any phase transformation. Examination shows that the grains underwent significant refinement due to dynamic recrystallization and that the coatings are much harder than the feedstock powder because of increased dislocation density and grain boundaries.
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Löbel, Martin, Thomas Lindner, Thomas Mehner, Lisa-Marie Rymer, Thomas Lampke, Stefan Björklund, and Shrikant Joshi. "Microstructure and Corrosion Properties of AlCoCrFeNi High-Entropy Alloy Coatings Prepared by HVAF and HVOF." In ITSC2021, edited by F. Azarmi, X. Chen, J. Cizek, C. Cojocaru, B. Jodoin, H. Koivuluoto, Y. C. Lau, et al. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.itsc2021p0416.

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Abstract High-entropy alloys (HEAs) represent an innovative development approach for new alloy systems. These materials have been found to yield promising properties, such as high strength in combination with sufficient ductility as well as high wear and corrosion resistance. Especially for alloys with a body-centered cubic (bcc) structure, advantageous surface properties have been revealed. However, typical HEA systems contain high contents of expensive or scarce elements. Consequently, applying them as coatings where their use is limited to the surface represents an exciting pathway enabling economical exploitation of their superior properties. Nevertheless, processing conditions strongly influence the resulting microstructure and phase formation, which in turn has a considerable effect on the functional properties of HEAs. In the presented study, microstructural differences between high-velocity oxygen fuel (HVOF) and high-velocity air fuel (HVAF) sprayed coatings of the alloy AlCrFeCoNi are investigated. A metastable bcc structure is formed in both coating processes. Precipitation reactions are suppressed by the rapid solidification during atomization and by the relatively low thermal input during spraying. The coating resistance to corrosive media was investigated in detail, and an improved passivation behavior was observed in the HVAF coatings.
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Löbel, M., T. Lindner, T. Lampke, and C. Kohrt. "Development of Wear-Resistant High-Entropy Alloy Coatings Produced by Thermal Spray Technology." In ITSC2017, edited by A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen, and C. A. Widener. DVS Media GmbH, 2017. http://dx.doi.org/10.31399/asm.cp.itsc2017p0200.

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Abstract The alloying concept of High-Entropy Alloys (HEA) has attracted much scientific interest due to an interesting combination of properties. Previous investigations have shown that high hardness and strength, comparable to bulk metallic glasses, can be achieved. Furthermore, HEAs show distinct ductility and good high-temperature resistance. First investigations on tribological properties are indicating high wear resistance. Previous investigations of the alloy system AlCoCrFeNiTi in bulk state have shown promising properties. Therefore, the alloy AlCoCrFeNiTi with equimolar composition was selected for transferring bulk properties to thermally sprayed coatings. The focus of this contribution is on studying tribological properties of thermally sprayed HEA coatings to enlarge the field of possible applications. Feedstock material production was carried out by high-energy ball milling (HEM) and inert gas atomization. Subsequently, coatings were deposited by Atmospheric Plasma Spray (APS). Tribological properties of the coatings under different wear regimes were investigated in ball-on-disk wear tests, oscillating wear tests and scratch tests. The tribological properties are compared with a conventional hard chrome plating and correlated with microstructure.
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Shahbazi, H., H. Vakilifard, R. B. Nair, A. C. Liberati, C. Moreau, and R. S. Lima. "High Entropy Alloy (HEA) Bond Coats for Thermal Barrier Coatings (TBCs)—A Review." In ITSC 2023. ASM International, 2023. http://dx.doi.org/10.31399/asm.cp.itsc2023p0659.

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Abstract Due to the aggressive operation conditions of turbine hot sections, protective coatings are required to provide oxidation and hot corrosion resistance for superalloy components. Thermal barrier coatings (TBCs) are comprised of a ceramic top coat and a metallic bond coat (BC) and are typically used as thermal protection systems against these aggressive environments. Conventional BC materials are MCrAlX, with M being metals or alloys (e.g., Ni, Co or NiCo) and X being reactive elements such as Y, Hf, Ta, Si. Due to their strength, thermal stability, and oxidation resistance, high-entropy alloys (HEAs) have presented promise for use as BC materials in hightemperature applications. Owing to its cocktail effect, optimally chosen HEAs could help to enhance the hot corrosion resistance of BCs by forming a more continuous, dense, and uniform thermally grown oxide (TGO). Furthermore, HEAs could help to control the diffusion between the bonding layer and substrate in elevated temperature environments. This paper will discuss the thermodynamic, mechanical, and microstructural behaviour of HEAs. Furthermore, the selection and usage of HEAs as BCs will be explored and compared to conventional BCs in TBC systems.
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Cappelli, Giacomo, Shuo Yin, and Rocco Lupoi. "Erosion Behaviour of Cold Sprayed Coatings Made of CrMnFeCoNi High-Entropy Alloy or Composite Powders Containing WC Hard Particles in a Pure Nickel Matrix." In ITSC 2023. ASM International, 2023. http://dx.doi.org/10.31399/asm.cp.itsc2023p0242.

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Abstract The performance of two distinct coating materials under alumina particle impingement was tested in this study. CrMnFeCoNi and WC-Ni coatings were applied to 2205 duplex stainless steel substrates using cold spray method with nitrogen as the process gas. In between the substrate and the high entropy alloy coating, an interlayer coating of 316 stainless steel was used. The presence of WC particles in the WC-Ni composite coatings was confirmed by SEM cross sectional inspection. Following deposition, the coatings were heat treated in an air furnace. The influence of heat treatment holding time on the WC-Ni coatings was studied using chemical analysis by X-ray diffraction. Heat treatments peak temperatures for the WC/Ni- Ni and high entropy alloy coatings were 600°C and 550°C, respectively. Coatings microhardness and porosity volume fraction were measured for all the samples. The HEA coating outperformed the WC/Ni-Ni hardness but exhibited a higher level of porosity. The coatings were then subjected to erosion experiments using alumina particles with variable impact angles (30°, 60°, and 90°). To compare the different materials, an average erosion value was calculated for each target specimen. The WC/Ni-Ni as-sprayed coating was the most effective against a 60° impingement angle. The HEA coating, on the other hand, demonstrated greater resistance to impact angles of 30° and 90°. SEM was utilized to examine the eroded areas and determine the main mechanisms of erosion.
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Pal, S., R. Bhaskaran Nair, and A. McDonald. "Influence of Microstructure on Hardness and Electric Resistivity of Flame-Sprayed High Entropy Alloy Coatings." In ITSC2022. DVS Media GmbH, 2022. http://dx.doi.org/10.31399/asm.cp.itsc2022p0534.

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Abstract High entropy alloys (HEAs) are classified as a new class of advanced metallic materials that have received significant attention in recent years due to their stable microstructures and promising properties. In this study, three mechanically alloyed equiatomic HEA coatings – AlCoCrFeMo, AlCoCrFeMoW, and AlCoCrFeMoV – were fabricated on stainless steel substrates using flame spray manufacturing technique. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and Vicker’s microhardness were utilized to characterize the fabricated HEA coatings. Furthermore, Joule heating experiments using a modified version of a two-probe test was used to measure the electrical resistivity of the HEA coatings. To prevent short-circuiting of the metallic coatings, a thin layer of alumina was deposited as a dielectric material prior to the deposition of HEA coatings. The microstructure of the HEA coatings showed the presence of multiple oxide regions along with solid-solution phases. The porosity levels were approximately 2 to 3% for all the HEA coatings. The HEA coatings had a thickness of approximately 130 to 140 μm, whereas the alumina layer was 120 to 160 μm thick. The electrical resistivity values were higher for all the HEA coatings compared to flame-sprayed Ni-20Cr and NiCrAlY coatings and AlCoCrFeNi HEA thin film, which may be attributed to the characteristics of HEAs, such as severe lattice distortion and solute segregations. The combined interaction of high hardness and increased electrical resistivity suggests that the flame-sprayed HEA coatings can be used as multifunctional wear-resistant materials for energy generation applications.
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Guo, Yanping, Suiyuan Chen, Zhaoqing Yuan, and Tiantian Guo. "FeCoNiAlTiCrSi high entropy alloy coating prepared by laser cladding." In 5th International Conference on Information Engineering for Mechanics and Materials. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/icimm-15.2015.113.

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Mahaffey, Jacob, Andrew Vackel, and Andrew Kustas. "Properties of Cold Sprayed and Controlled Atmospheric Plasma Sprayed High Entropy Alloy (CoCrFeMnNi) Coatings." In Proposed for presentation at the International Thermal Spray Conference and Exposition held May 24 - April 28, 2021. US DOE, 2021. http://dx.doi.org/10.2172/1867792.

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Reports on the topic "High Entropy Alloy Coatings"

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El Atwani, Osman, Enrique Martinez Saez, Nan Li, Jon Kevin Scott Baldwin, Stuart Andrew Maloy, Meimei Li, Duc Nguyen, Damian Sobieraj, Jan Wrobel, and Arun Devaraj. High irradiation resistance of nanocrystalline W-based high entropy alloy. Office of Scientific and Technical Information (OSTI), October 2019. http://dx.doi.org/10.2172/1573323.

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Yang, Shizhong. An Integrated Study on a Novel High Temperature High Entropy Alloy. Office of Scientific and Technical Information (OSTI), December 2016. http://dx.doi.org/10.2172/1430114.

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Pandey, Anup. Adaptive machine-learned force field development for high entropy alloy studies. Office of Scientific and Technical Information (OSTI), May 2022. http://dx.doi.org/10.2172/1868213.

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Luo, Jian. High-Entropy Ceramic Coatings: Transformative New Materials for Environmentally-Compatible Thin-Film Insulators against High-T Molten Salts. Office of Scientific and Technical Information (OSTI), November 2022. http://dx.doi.org/10.2172/1897087.

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Ruschau. L51961 Coating Compatibility at Thermite Welds and Keyhole Excavations. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), December 2002. http://dx.doi.org/10.55274/r0010247.

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Patching and repairing high performance pipeline coatings requires a high performance repair material to ensure the integrity of the coating system. The application conditions are not optimized as they are during plant applications, so it is imperative that repair coatings applied to mainline coatings will adhere to all coated surfaces so that resources can be focused on optimizing application methods. Compatibility of repair coatings applied to thermite weld components may be inadequate for optimum field performance. When combined with the limiting factors of keyhole excavations it is important to use coatings which are not only compatible with the thermite welds but also are suitable for the keyhole application procedure. A series of 14 pipeline repair coatings were evaluated for their compatibility with the components of a thermite weld. Chemical compatibility was determined in terms of adhesion with the thermite weld individual components: polyethylene wire insulation, polyvinylchloride wire insulation, copper wire, steel, and copper/aluminum thermite alloy. The same coatings were evaluated for their suitability for application by keyhole excavation procedures. A keyhole excavation was simulated using a scaffold over filled soil boxes (dry soil) containing buried pipe sections, and each of the repair coatings was applied by a commercial keyhole excavation company. The ease of application and general suitability was rated. After backfilling and aging for six months, the samples were removed from the soil boxes and the coatings evaluated.
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Patchett, B. M., and A. C. Bicknell. L51706 Higher-Strength SMAW Filler Metals. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), December 1993. http://dx.doi.org/10.55274/r0010418.

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The welding of high strength steels in general, and for pipeline fabrication in particular, has shown that cracking due to hydrogen absorption during welding is more complex in these steels than in older, lower strength steels. In older steels, primary strengthening was accomplished with carbon, which caused hydrogen cracking in the base metal HAZ under reasonably predictable conditions involving microstructure, residual stress and hydrogen level. Pipeline steels were and are in the vanguard of change in strengthening philosophy. The change involves two areas of steel making, chemical composition and deformation processing. Pipeline steels now contain low carbon levels, in many cases less than 0.10%, and the resulting lack of strength is reclaimed by adding higher alloy levels to promote solution hardening (e.g. Mn), precipitation hardening (e.g. Cb, Cu) or transformation hardening (e.g. MO). In addition, alloy elements are added to improve toughness at high strength levels (e.g. Ni). At the same time, improvements have been made in reducing impurity and residual element levels, notably for S, P and O and N. Limitations on the effects of alloying additions on strength and toughness encouraged the use of deformation processing, primarily during rolling, to promote fine-grained microstructures to increase strength andtoughness simultaneously. Electrodes for the SMAW process have been developed for welding high-strength pipeline steels by using core wires made from high-strength microalloyed skelp extruded with cellulosic (Exx10) and low hydrogen (Exx16) flux coatings. The required alloy elements for high-strength deposits were therefore obtained from the core wire and not ferroalloy powders added to the flux, as is standard industrial practice. The idea behind this change was two fold: to avoid the possibility of introducing impurities from the varying sources of ferro alloy powders, including oxygen from the oxidized powder surfaces, and also to provide a closer match of the microalloy level to modern pipeline steel chemistries. The unknowns in this work were the effects of lower impurities/similar alloy content on the mechanical properties in the cast microstructure of a weld, compared to a pipe, and of the effect on electrode welding behaviour of a flux containing no ferro powders other than FeSi.
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Patil and Cerkovnik. PR-425-123722-R01 Internally Lined Steel Risers as an Alternative to CRAs. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), October 2013. http://dx.doi.org/10.55274/r0010573.

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Carbon steel and low alloy steel are the common, cost effective materials of choice for design of production risers in deep water. They are, however, often challenged by high stress and fatigue loadings. When production fluids are corrosive and or sour, steel risers may not be feasible without the protection from corrosive effects. To mitigate degradation, the only proven solution to date is the use of corrosion resistant alloys (CRA), either in homogeneous or clad/lined steel pipe product. However, corrosion resistant alloys are very expensive and market supply is limited due to the number of developments worldwide requiring CRA solutions and the limited number mills capable of supplying the product. This study looks at the feasibility and current state of development of alternatives to clad steel in steel catenary risers (SCR). The study focuses on polymer liners and coatings as a way to prolong the life of the risers in corrosive hydrocarbon service. The study includes an industry survey of candidate liners and a risk assessment based on the threats and failure modes. FMECA is conducted on the more promising candidates. The gaps in the knowledge base are identified and a map of further qualification requirements is made. SCRs are currently fabricated with girth welds. However, there is significant amount of testing that indicates that mechanical connectors are a feasible alternative. The potential use of mechanical connectors in conjunction with a coating or liner solution to mitigate corrosion risks is also addressed.
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