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Academic literature on the topic 'Superalloys High entropy alloys'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Superalloys High entropy alloys"

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Zhang, Hang, Yizhen Zhao, Sheng Huang, Shuo Zhu, Fu Wang, and Dichen Li. "Manufacturing and Analysis of High-Performance Refractory High-Entropy Alloy via Selective Laser Melting (SLM)." Materials 12, no. 5 (March 1, 2019): 720. http://dx.doi.org/10.3390/ma12050720.

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Refractory high-entropy alloys (HEAs) have excellent mechanical properties, which could make them the substitutes of some superalloys. However, the high melting point of refractory HEAs leads to processing problems when using traditional processing techniques. In this study, a single BCC solid solution of NbMoTaW alloy was formed by selective laser melting (SLM) with a linear energy density of up to 2.83 J/mm. The composition distribution was analyzed, and the element with a lower melting point and lower density showed a negative deviation (no more than 5%) of the molar ratio in the formed alloy. The HEA shows an excellent microstructure, microhardness, and corrosion resistance performance compared with traditional superalloys, making it a new substitute metal with great application prospects in aerospace and energy fields.
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Manzoni, Anna, Sebastian Haas, Haneen Daoud, Uwe Glatzel, Christiane Förster, and Nelia Wanderka. "Tensile Behavior and Evolution of the Phases in the Al10Co25Cr8Fe15Ni36Ti6 Compositionally Complex/High Entropy Alloy." Entropy 20, no. 9 (August 29, 2018): 646. http://dx.doi.org/10.3390/e20090646.

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Compositionally complex alloys, or high entropy alloys, are good candidates for applications at higher temperatures in gas turbines. After their introduction, the equiatomic Al17Co17Cr17Cu17Fe17Ni17 (at.%) served as a starting material and a long optimization road finally led to the recently optimized Al10Co25Cr8Fe15Ni36Ti6 (at.%) alloy, which shows promising mechanical properties. Investigations of the as-cast state and after different heat treatments focus on the evolution of the microstructure and provide an overview of some mechanical properties. The dendritic solidification provides two phases in the dendritic cores and two different ones in the interdendritic regions. Three of the four phases remain after heat treatments. Homogenization and subsequent annealing produce a γ-γ’ based microstructure, similar to Ni-based superalloys. The γ phase is Co-Cr-Fe rich and the γ’ phase is Al-Ni-Ti rich. The understanding of the mechanical behavior of the investigated alloy is supported and enhanced by the study of the different phases and their nanohardness measurements. The observations are compared with mechanical and microstructural data from commercial Ni-based superalloys, Co-based alloys, and Co-Ni-based alloys at the desired application temperature of ~800 °C.
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Liu, Feng, Zexin Wang, Zi Wang, Zijun Qin, Zihang Li, Liang Jiang, Lan Huang, Liming Tan, and Yong Liu. "Evaluating yield strength of Ni-based superalloys via high throughput experiment and machine learning." Journal of Micromechanics and Molecular Physics 05, no. 04 (December 2020): 2050015. http://dx.doi.org/10.1142/s2424913020500150.

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Yield strength (YS) is a key factor during design and application of Ni-based superalloys with complex compositions, hence it is of great significance to evaluate the YS prior to manufacturing. In this work, alloy diffusion-multiple technology was employed as a high-throughput way to yield the hardness dataset. Based on the composition and other descriptors, Pearson correlation coefficients, stability selection and feature importance were used to select the efficient feature variables. Thereafter, six different machine learning models were applied to predict the YS. Finally, the individual and interaction effect of Co and Mo could be effectively detected by the Gaussian process regression (GPR) model. The optimum composition of Ni-based superalloys with the largest YS at room temperature was determined using the trained GPR model and genetic algorithm. This method can be extended to predict the YS in other multicomponent alloys, such as Ti alloys, Co-based alloys, and high entropy alloys.
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Wang, Z., Y. Huang, J. Wang, and C. T. Liu. "Design of high entropy alloys based on the experience from commercial superalloys." Philosophical Magazine Letters 95, no. 1 (January 2, 2015): 1–6. http://dx.doi.org/10.1080/09500839.2014.987841.

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Cobbinah, Prince Valentine, Rivel Armil Nzeukou, Omoyemi Temitope Onawale, and Wallace Rwisayi Matizamhuka. "Laser Powder Bed Fusion of Potential Superalloys: A Review." Metals 11, no. 1 (December 30, 2020): 58. http://dx.doi.org/10.3390/met11010058.

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The laser powder bed fusion (LPBF) is an additive manufacturing technology involving a gradual build-on of layers to form a complete component according to a computer-aided design. The LPBF process boasts of manufacturing value-added parts with higher accuracy and complex geometries for the transport, aviation, energy, and biomedical industries. TiAl-based alloys and high-entropy alloys (HEAs) are two materials envisaged as potential replacements of nickel-based superalloys for high temperature structural applications. The success of these materials hinge on optimization and implementation of tailored microstructures through controlled processing and appropriate alloy manipulations that can promote and stabilize new microstructures. Therefore, it is important to understand the LPBF technique, and its associated microstructure-mechanical property relationships. This paper discusses the metallurgical sintering processes of LPBF, the effects of process parameters on densification, microstructures, and mechanical properties of LPBFed TiAl-based alloys and HEAs. This paper also, presents updates and future studies recommendations on the LPBFed TiAl-based alloys and HEAs.
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Liu, Tian-Wei, Tong Li, and Lan-Hong Dai. "Near-Equiatomic μ Phase in Self-Sharpening Tungsten-Based High-Entropy Alloys." Metals 12, no. 7 (July 1, 2022): 1130. http://dx.doi.org/10.3390/met12071130.

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The topologically close-packed (TCP) μ phase is usually known as an undesirable precipitation in highly alloyed Ni-base superalloys and steels. However, the ultrastrong μ phase with micron/nano-scale distribution plays a key role in driving the emergence of self-sharpening in our recently developed WMoFeNi high-entropy alloy (HEA). Herein, a detailed study is carried out to understand the substructure and atomic occupation of the μ phase by scanning electron microscope (SEM) and aberration-corrected transmission electron microscope (ACTEM). The Fe/Ni and W/Mo element pairs are equivalent in the μ-phase structure. Moreover, the elements in μ phase exhibit a near-equiatomic ratio, and the μ phase can grow during annealing at 1150 °C. (0001)μ and (11¯02)μ. Twins are the main substructures of the μ phase, and their atomic configurations and twinning mechanisms are investigated. The geometrical structural analysis of μ phase possesses a great significance for the design of self-sharpening HEAs.
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Tseng, Ko-Kai, Chien-Chang Juan, Shuen Tso, Hsuan-Chu Chen, Che-Wei Tsai, and Jien-Wei Yeh. "Effects of Mo, Nb, Ta, Ti, and Zr on Mechanical Properties of Equiatomic Hf-Mo-Nb-Ta-Ti-Zr Alloys." Entropy 21, no. 1 (December 25, 2018): 15. http://dx.doi.org/10.3390/e21010015.

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Nowadays refractory high-entropy alloys (RHEAs) are regarded as great candidates for the replacement of superalloys at high temperature. To design a RHEA, one must understand the pros and cons of every refractory element. However, the elemental effect on mechanical properties remains unclear. In this study, the subtraction method was applied on equiatomic HfMoNbTaTiZr alloys to discover the role of each element, and, thus, HfMoNbTaTiZr, HfNbTaTiZr, HfMoTaTiZr, HfMoNbTiZr, HfMoNbTaZr, and HfMoNbTaTi were fabricated and analyzed. The microstructure and mechanical properties of each alloy at the as-cast state were examined. The solid solution phase formation rule and the solution strengthening effect are also discussed. Finally, the mechanism of how Mo, Nb, Ta, Ti, and Zr affect the HfMoNbTaTiZr alloys was established after comparing the properties of these alloys.
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Naser-Zoshki, Hamed, Ali-Reza Kiani-Rashid, and Jalil Vahdati-Khaki. "Non-equiatomic W10Mo27Cr21Ti22Al20 high-entropy alloy produced by mechanical alloying and spark plasma sintering: Phase evolution and mechanical properties." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 236, no. 4 (January 12, 2022): 695–703. http://dx.doi.org/10.1177/14644207211051038.

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In this work, non-equiatomic W10Mo27Cr21Ti22Al20 refractory high-entropy alloy (RHEA) was produced using mechanical alloying followed by spark plasma sintering. The phase formation, microstructure, and compressive mechanical properties of the alloy were studied. During mechanical alloying, a Body-centered cubic (BCC) solid solution phase with a particle size of less than 1 µm was obtained after 18 h ball milling. The microstructure of the sintered sample exhibits three distinct phases consisting of two solid solution phases BCC1 and BCC2 as well as fine TiCxOy precipitates distributed in them. The volume fractions of each phase were about 79%, 8%, and 13%, respectively. The sintered W10Mo27Cr21Ti22Al20 showed yield strengths of 2465, 1506, 405, and 290 MPa at room temperature 600, 1000, and 1200°C, respectively, which are about twice that of the same refractory high-entropy alloy produced by vacuum arc melting. At 1000 and 1200°C, the strength after yielding gradually increased to 970 and 718 MPa at a compressive strain of 60%. The studied refractory high-entropy alloy can have good potential in high-temperature applications due to its high specific strength at elevated temperatures compared to conventional Ni-based superalloys and most as-reported refractory high-entropy alloys.
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Tsao, Te-Kang, An-Chou Yeh, and Hideyuki Murakami. "The Microstructure Stability of Precipitation Strengthened Medium to High Entropy Superalloys." Metallurgical and Materials Transactions A 48, no. 5 (March 8, 2017): 2435–42. http://dx.doi.org/10.1007/s11661-017-4037-6.

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Haas, Sebastian, Anna M. Manzoni, Fabian Krieg, and Uwe Glatzel. "Microstructure and Mechanical Properties of Precipitate Strengthened High Entropy Alloy Al10Co25Cr8Fe15Ni36Ti6 with Additions of Hafnium and Molybdenum." Entropy 21, no. 2 (February 12, 2019): 169. http://dx.doi.org/10.3390/e21020169.

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High entropy or compositionally complex alloys provide opportunities for optimization towards new high-temperature materials. Improvements in the equiatomic alloy Al17Co17Cr17Cu17Fe17Ni17 (at.%) led to the base alloy for this work with the chemical composition Al10Co25Cr8Fe15Ni36Ti6 (at.%). Characterization of the beneficial particle-strengthened microstructure by scanning electron microscopy (SEM) and observation of good mechanical properties at elevated temperatures arose the need of accomplishing further optimization steps. For this purpose, the refractory metals hafnium and molybdenum were added in small amounts (0.5 and 1.0 at.% respectively) because of their well-known positive effects on mechanical properties of Ni-based superalloys. By correlation of microstructural examinations using SEM with tensile tests in the temperature range of room temperature up to 900 °C, conclusions could be drawn for further optimization steps.
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Dissertations / Theses on the topic "Superalloys High entropy alloys"

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Slone, Connor. "Influence of composition and processing on the mechanical response of multi-principal element alloys containing Ni, Cr, and Co." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555522223986934.

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Jensen, Jacob K. "Characterization of a High Strength, Refractory High Entropy Alloy, AlMo0.5NbTa0.5TiZr." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492175560975813.

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Huang, Shuo. "Theoretical Investigations of High-Entropy Alloys." Licentiate thesis, KTH, Tillämpad materialfysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-218162.

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High-entropy alloys (HEAs) are composed of multi-principal elements with equal or near-equal concentrations, which open up a vast compositional space for alloy design. Based on first-principle theory, we focus on the fundamental characteristics of the reported HEAs, as well as on the optimization and prediction of alternative HEAs with promising technological applications. The ab initio calculations presented in the thesis confirm and predict the relatively structural stability of different HEAs, and discuss the composition and temperature-induced phase transformations. The elastic behavior of several HEAs are evaluated through the single-crystal and polycrystalline elastic moduli by making use of a series of phenomenological models. The competition between dislocation full slip, twinning, and martensitic transformation during plastic deformation of HEAs with face-centered cubic phase are analyzed by studying the generalized stacking fault energy. The magnetic moments and magnetic exchange interactions for selected HEAs are calculated, and then applied in the Heisenberg Hamiltonian model in connection with Monte-Carlo simulations to get further insight into the magnetic characteristics including Curie point. The Debye-Grüneisen model is used to estimate the temperature variation of the thermal expansion coefficient. This work provides specific theoretical points of view to try to understand the intrinsic physical mechanisms behind the observed complex behavior in multi-component systems, and reveals some opportunities for designing and optimizing the properties of materials

QC 20171127

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Gwalani, Bharat. "Developing Precipitation Hardenable High Entropy Alloys." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1011755/.

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High entropy alloys (HEAs) is a concept wherein alloys are constructed with five or more elements mixed in equal proportions; these are also known as multi-principle elements (MPEs) or complex concentrated alloys (CCAs). This PhD thesis dissertation presents research conducted to develop precipitation-hardenable high entropy alloys using a much-studied fcc-based equi-atomic quaternary alloy (CoCrFeNi). Minor additions of aluminium make the alloy amenable for precipitating ordered intermetallic phases in an fcc matrix. Aluminum also affects grain growth kinetics and Hall-Petch hardenability. The use of a combinatorial approach for assessing composition-microstructure-property relationships in high entropy alloys, or more broadly in complex concentrated alloys; using laser deposited compositionally graded AlxCrCuFeNi2 (0 < x < 1.5) complex concentrated alloys as a candidate system. The composition gradient has been achieved from CrCuFeNi2 to Al1.5CrCuFeNi2 over a length of ~25 mm, deposited using the laser engineered net shaping process from a blend of elemental powders. With increasing Al content, there was a gradual change from an fcc-based microstructure (including the ordered L12 phase) to a bcc-based microstructure (including the ordered B2 phase), accompanied with a progressive increase in microhardness. Based on this combinatorial assessment, two promising fcc-based precipitation strengthened systems have been identified; Al0.3CuCrFeNi2 and Al0.3CoCrFeNi, and both compositions were subsequently thermo-mechanically processed via conventional techniques. The phase stability and mechanical properties of these alloys have been investigated and will be presented. Additionally, the activation energy for grain growth as a function of Al content in these complex alloys has also been investigated. Change in fcc grain growth kinetic was studied as a function of aluminum; the apparent activation energy for grain growth increases by about three times going from Al0.1CoCrFeNi (3% Al (at%)) to Al0.3CoCrFeNi. (7% Al (at%)). Furthermore, Al addition leads to the precipitation of highly refined ordered L12 (γ′) and B2 precipitates in Al0.3CoCrFeNi. A detailed investigation of precipitation of the ordered phases in Al0.3CoCrFeNi and their thermal stability is done using atom probe tomography (APT), transmission electron microscopy (TEM) and Synchrotron X-ray in situ and ex situ analyses. The alloy strengthened via grain boundary strengthening following the Hall-Petch relationship offers a large increment of strength with small variation in grain size. Tensile strength of the Al0.3CoFeNi is increased by 50% on precipitation fine-scale γ′ precipitates. Furthermore, precipitation of bcc based ordered phase B2 in Al0.3CoCrFeNi can further strengthen the alloy. Fine-tuning the microstructure by thermo-mechanical treatments achieved a wide range of mechanical properties in the same alloy. The Al0.3CoCrFeNi HEA exhibited ultimate tensile strength (UTS) of ~250 MPa and ductility of ~65%; a UTS of ~1100 MPa and ductility of ~30%; and a UTS of 1850 MPa and a ductility of 5% after various thermo-mechanical treatments. Grain sizes, precipitates type and size scales manipulated in the alloy result in different strength ductility combinations. Henceforth, the alloy presents a fertile ground for development by grain boundary strengthening and precipitation strengthening, and offers very high activation energy of grain growth aptly suitable for high-temperature applications.
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Shittu, Jibril. "Tribo-Corrosion of High Entropy Alloys." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1752392/.

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In this dissertation, tribo-corrosion behavior of several single-phase and multi-phase high entropy alloys were investigated. Tribo-corrosion of body centered cubic MoNbTaTiZr high entropy alloy in simulated physiological environment showed very low friction coefficient (~ 0.04), low wear rate (~ 10-8 mm3/Nm), body-temperature assisted passivation, and excellent biocompatibility with respect to stem cells and bone forming osteoblast cells. Tribo-corrosion resistance was evaluated for additively manufactured face centered cubic CoCrFeMnNi high entropy alloy in simulated marine environment. The additively manufactured alloy was found to be significantly better than its as-cast counterpart which was attributed to the refined microstructure and homogeneous elemental distribution. Additively manufactured CoCrFeMnNi showed lower wear rate, regenerative passivation, less wear volume loss, and nobler corrosion potential during tribo-corrosion test compared to its as-cast equivalent. Furthermore, in the elevated temperature (100 °C) tribo-corrosion environment, AlCoCrFeNi2.1 eutectic high entropy alloy showed excellent microstructural stability and pitting resistance with an order of magnitude lower wear volume loss compared to duplex stainless steel. The knowledge gained from tribo-corrosion response and stress-corrosion susceptibility of high entropy alloys was used in the development of bio-electrochemical sensors to sense implant degradation. The results obtained herewith support the promise of high entropy alloys in outperforming currently used structural alloys in the harsh tribo-corrosion environment.
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Asensio, Dominguez Laura. "Combinatorial high throughput synthesis of high entropy alloys." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/16722/.

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This PhD thesis is a part of the Accelerated Metallurgy (AccMet) project funded under the Seventh Framework Programme. AccMet’s aims consists on the delivery of an integrated pilot-scale facility for the combinatorial synthesis and testing of those unexplored material. The contribution of this thesis to AccMet has been expanded in 3 years while focused in the understanding and development of a methodology suitable for the combinatorial synthesis of novel materials, and particularly of High Entropy Alloys (HEAs). These novel materials are composed of multiple elements at near equiatomic levels with the capacity of forming simple crystalline phases such as bcc and fcc instead of the expected intermetallic compounds as well as their excellent combination of structural and functional properties compared to the traditional materials. A mathematical technique known as Principal Component Analysis has been used here to identify patterns within a set of metallic systems forming a wide range of crystalline structures. This technique would not only speed up the compositional design stage but also contribute to the development of a virtual library containing all the explored systems. Mercury Centre has been an important key during the synthesis of HEAs where Spark Plasma Sintering (SPS) and Electron Beam Melting (EBM) have been successfully applied for the development of the thesis. The final combination of the design stage, production and characterisation of HEAs developed in this thesis would result in an advances technique suitable not only for the synthesis of novel HEAs, but also for the discovery of other unexplored systems.
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Cunliffe, Andrew. "Origin of properties in high entropy alloys." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/22395/.

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The novel class of alloys known as high entropy alloys (HEAs) present two fundamental problems; 1) prediction of their properties and reaction to alloying adjustments, 2) prediction of compositions capable of forming the random solid solution with simple crystal structure that appears to be key to their behaviour. Here DFT is applied to model the electronic structure of HEAs based on the CoCrFeNi pseudo base metal. This approach explains a number of properties such as preferred crystal structure and allows fundamental properties such as elastic moduli to be calculated accurately. The stability of HEAs is discussed and compared to that of bulk metallic glasses and a composition is produced which is capable of forming both a glassy and high entropy solid solution phase. A simple thermodynamic model is proposed to allow likely HEA solid solution forming compositions to be identified. This modelling approach using both DFT and thermodynamics is used to assess two potential high entropy alloys based on light metals. The approach shows that the electronic structure of HEAs may be used to predict their properties and therefore their behaviour is due to a free electron structure, it also suggests that the most important consideration in their stability as solid solution alloys is a lack of strong covalent interactions, ie a close to zero entropy of mixing.
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Soni, Vishal. "Phase Transformations in Refractory High Entropy Alloys." Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1538735/.

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High entropy alloys (HEAs) based on refractory elements have shown a great potential for high temperature structural applications. In particular, the ones containing Al, exhibits a microstructure similar to the γ-γ' in Ni-based superalloys. While these alloys exhibit impressive strengths at room temperature (RT) and at elevated temperatures, the continuous B2 matrix in these alloys is likely to be responsible for their brittle behavior at RT. Phase stability of five such alloys are studied by thermo-mechanical treatments and characterization techniques using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Two of these alloys showed an inverted microstructure, where the disordered BCC phase becomes continuous, and therefore, they were characterized in detail using SEM, TEM, atom probe tomography (APT) and synchrotron x-ray diffraction experiments. The phenomenon of phase inversion lead to a better combination of strength and ductility as compared to the non-inverted microstructure.To enhance the stability of B2 intermetallic phase which provides the strength when present in a BCC matrix, multicomponent B2 phase compositions stable at 1000°C in some of the above studied alloys, were melted separately. The aim was to establish a single phase B2 at 1000°C and understand the mechanical behavior of these single-phase multicomponent B2 intermetallic alloys. These alloys exhibited a ductile behavior under compression and retained ~1 GPa yield strength at temperature up to 600°C. The ductile nature of these alloys is attributed to the change in bonding nature form directional to metallic bonding, possibly resulting from a significantly high configurational entropy compared to binary or ternary stoichiometric B2 compounds.
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Stasiak, Tomasz. "High Entropy Alloys with improved mechanical properties." Thesis, Lille 1, 2020. http://www.theses.fr/2020LIL1R050.

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Les Alliages à Haute Entropie (AHEs ou HEAs en anglais) sont un nouveau type d'alliages multi-élémentaires. Ils contiennent au moins cinq éléments de teneur comprise entre 5 et 35 at %. L'entropie de configuration élevée, qui est une raison du nom de cette famille d'alliages, ainsi que d'autres paramètres, tels que l'enthalpie de mélange, la différence de taille atomique, la différence d'électronégativité ou la concentration d'électrons de valence, stabilisent une solution solide plutôt que des composés intermétalliques. L'attention de la communauté scientifique a été attirée par les propriétés prometteuses et les microstructures intéressantes des HEAs.Dans ce travail, une nouvelle famille de HEAs Al-Cr-Fe-Mn-Mo a été étudiée. Les analyses microstructurales et chimiques ont été menées par DRX, spectrométrie Mössbauer, MEB, MET, EDX, EBSD. Dans un premier temps, des calculs basés sur une approche paramétrique ont été réalisés pour optimiser la composition chimique. Les compositions sélectionnées ont été préparées par mécanosynthèse dans différents types broyeurs. Les conditions optimisées garantissant une homogénéité chimique maximale de la poudre et une faible contamination par les matériaux des billes et des jarres ont été déterminées. Deux phases cubique centrée (cc) se forment pendant la mécanosynthèse avec les paramètres de maille 3,13 Å (cc#1) et 2,93 Å (cc#2). Le traitement thermique de la poudre entraîne plusieurs transformations de phase (la formation de la phase χ). Le recuit à 950 °C/1 h favorise l'augmentation de la fraction volumique de la phase cc#2, tandis que les cc#1 et χ disparaissent. Néanmoins, de petites fractions de carbures et d'oxydes ont été trouvées.Les échantillons massifs ont été fabriqués par frittage à chaud des poudres mécanosynthétisées. Les conditions de consolidation ont été évaluées et optimisées pour favoriser la formation de la phase cc et réduire la formation de carbures et d'oxydes résultant de la contamination. Les échantillons massifs optimisés présentent une phase majoritaire cubique centrée (> 95 % volumique) avec un paramètre de maille de 2,92 Å et une très petite quantité de carbures (M6C, M23C6) et d'oxydes (Al2O3). La phase cc est stable après recuit à 950 °C pendant 10 h. De plus, l'alliage présente une dureté très élevée jusqu'à 950 HV2N. Les essais de compression de l'échantillon massif optimisé, entre la température ambiante et 800 °C, révèlent des propriétés prometteuses, en particulier entre 600 et 700 °C. L'alliage présente un comportement fragile entre la température ambiante et 400 °C. Cependant, l'alliage commence à démontrer un certain degré de plasticité à 500 °C. À 600 °C, la limite d'élasticité est de 1022 MPa, tandis que la déformation à la rupture est d'environ 22 %
High Entropy Alloys (HEAs) are a new type of multicomponent alloys. They contain at least five elements with the content of each between 5 and 35 at. %. The high configuration entropy, which is the source of the name of the whole family of alloys, together with other parameters, such as mixing enthalpy, atomic size difference, electronegativity difference, or valence electron concentration, stabilize a solid solution instead of complex intermetallic compounds. Promising properties and interesting microstructures focus the attention of the scientific community to HEAs.In this work, the novel Al-Cr-Fe-Mn-Mo high entropy alloy family was studied. The microstructural and chemical analyses were performed by XRD, Mössbauer spectrometry, SEM, TEM, EDX, EBSD. In the first stage, parametric approach calculations were carried out to optimize the chemical composition of the alloy. The selected compositions were prepared by mechanical alloying in different devices. The optimized conditions that ensure maximum chemical homogeneity of powder and the small contamination from balls and vial materials were chosen. In most of the powders, two bcc phases form during mechanical alloying with the lattice parameters about 3.13 Å (bcc#1) and 2.93 Å (bcc#2). The heat treatment of powder results in several phase transformations (e.g., the formation of the χ phase). The annealing at 950 °C for 1 h promotes the significant increase of volume fraction of the bcc#2 phase, while the bcc#1 and χ disappear. Nevertheless, small fractions of carbides and oxides were found. The bulk samples were fabricated by hot press sintering of the optimized mechanically alloyed powders. The conditions of consolidation were evaluated and optimized to promote the formation of the bcc phase and reduce the formation of carbides and oxides resulting from the contamination during mechanical alloying and sintering. The optimized bulk samples present a major disordered body-centered cubic phase (> 95 % of volume fraction) with a lattice parameter of 2.92 Å and a very small fraction of carbides (M6C, M23C6) and oxides (Al2O3). The bcc phase is stable after annealing at 950 °C for 10 h. Moreover, the alloy presents very high hardness up to 950 HV2N. The compression tests of the optimized bulk sample from room temperature to 800 °C reveal promising properties, especially between 600 and 700 °C. The alloy shows brittle behavior between room temperature and 400 °C. However, the alloy starts to demonstrate some degree of plasticity at 500 °C. At 600 °C, the yield strength is 1022 MPa, while strain to failure is about 22 %
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Alagarsamy, Karthik. "Application of High Entropy Alloys in Stent Implants." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984159/.

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High entropy alloys (HEAs) are alloys with five or more principal elements. Due to these distinct concept of alloying, the HEA exhibits unique and superior properties. The outstanding properties of HEA includes higher strength/hardness, superior wear resistance, high temperature stability, higher fatigue life, good corrosion and oxidation resistance. Such characteristics of HEA has been significant interest leading to researches on these emerging field. Even though many works are done to understand the characteristic of these HEAs, very few works are made on how the HEAs can be applied for commercial uses. This work discusses the application of High entropy alloys in biomedical applications. The coronary heart disease, the leading cause of death in the United States kills more than 350,000 persons/year and it costs $108.9 billion for the nation each year in spite of significant advancements in medical care and public awareness. A cardiovascular disease affects heart or blood vessels (arteries, veins and capillaries) or both by blocking the blood flow. As a surgical interventions, stent implants are deployed to cure or ameliorate the disease. However, the high failure rate of stents has lead researchers to give special attention towards analyzing stent structure, materials and characteristics. Many works related to alternate material and/or design are carried out in recent time. This paper discusses the feasibility of CoCrFeNiMn and Al0.1CoCrFeNi HEAs in stent implant application. This work is based on the speculation that CoCrFeNiMn and Al0.1CoCrFeNi HEAs are biocompatible material. These HEAs are characterized to determine the microstructure and mechanical properties. Computational modeling and analysis were carried out on stent implant by applying CoCrFeNiMn and Al0.1CoCrFeNi HEAs as material to understand the structural behavior.
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Books on the topic "Superalloys High entropy alloys"

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Srivatsan, T. S., and Manoj Gupta. High Entropy Alloys. Edited by T. S. Srivatsan and Manoj Gupta. Boca Raton : CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9780367374426.

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Gao, Michael C., Jien-Wei Yeh, Peter K. Liaw, and Yong Zhang, eds. High-Entropy Alloys. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27013-5.

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Gromov, V. E., S. V. Konovalov, Yu F. Ivanov, and K. A. Osintsev. Structure and Properties of High-Entropy Alloys. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78364-8.

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International Symposium on Superalloys. (6th 1988 Champion, Pa.). Superalloys 1988: Proceedings of the Sixth International Symposium on Superalloys sponsored by the High Temperature Alloys Committee of the Metallurgical Society, held September 18-22, 1988, Seven Springs Mountain Resort, Champion Pennsylvania. Warrendale, Pa: The Society, 1988.

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International Symposium on Superalloys (8th 1996 Champion, Pa.). Superalloys 1996: Proceedings of the Eighth International Symposium on Superalloys sponsored by the Seven Springs International Symposium Committee, in cooperation with TMS, the TMS High Temperature Alloys Committee, and ASM International, held September 22-26, 1996, Seven Springs Mountain Resort, Champion, Pennsylvania. Warrendale, Pa: The Minerals, Metals & Materials Society, 1996.

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International Symposium on Superalloys. (7th 1992 Champion, Pa.). Superalloys 1992: Proceedings of the Seventh International Symposium on Superalloys sponsored by the TMS Seven Springs International Symposium Committee, in cooperation with the TMS High Temperature Alloys Committee, ASM International, and the American Society of Mechanical Engineers, held September 20-24, 1992, Seven Springs Mountain Resort, Champion, Pa. Warrendale, Pa: The Minerals, Metals & Materials Soc., 1992.

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Ranganathan, S., Murty B. S, Jien-Wei Yeh, and P. P. Bhattacharjee. High-Entropy Alloys. Elsevier, 2019.

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High Entropy Alloys. Taylor & Francis Group, 2020.

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Kolisnychenko, Stanislav, Elena Gordo Odériz, and Juan Cornide Arce. High-Entropy Alloys. Trans Tech Publications, Limited, 2021.

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Zhang, Yong, Michael C. Gao, Jien-Wei Yeh, and Peter K. Liaw. High-Entropy Alloys. Springer, 2016.

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Book chapters on the topic "Superalloys High entropy alloys"

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Tsao, Te-Kang, An-Chou Yeh, Jien-Wei Yeh, Mau-Sheng Chiou, Chen-Ming Kuo, H. Murakami, and Koji Kakehi. "High Temperature Properties of Advanced Directionally-Solidified High Entropy Superalloys." In Superalloys 2016, 1001–9. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119075646.ch106.

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DebRoy, T., and H. K. D. H. Bhadeshia. "High-Entropy Alloys." In Innovations in Everyday Engineering Materials, 95–104. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-57612-7_9.

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Bansal, Gaurav Kumar, Avanish Kumar Chandan, Gopi Kishor Mandal, and Vikas Chandra Srivastava. "High Entropy Alloys." In High Entropy Alloys, 1–68. Boca Raton : CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9780367374426-1.

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Neelima, P., S. V. S. Narayana Murthy, P. Chakravarthy, and T. S. Srivatsan. "High Entropy Alloys." In High Entropy Alloys, 473–546. Boca Raton : CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9780367374426-19.

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Shahi, Rohit R., and Rajesh K. Mishra. "High Entropy Alloys." In High Entropy Alloys, 655–88. Boca Raton : CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9780367374426-22.

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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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Yeh, Jien-Wei. "Overview of High-Entropy Alloys." In High-Entropy Alloys, 1–19. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27013-5_1.

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Gao, Michael C., Changning Niu, Chao Jiang, and Douglas L. Irving. "Applications of Special Quasi-random Structures to High-Entropy Alloys." In High-Entropy Alloys, 333–68. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27013-5_10.

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Gao, Michael C. "Design of High-Entropy Alloys." In High-Entropy Alloys, 369–98. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27013-5_11.

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Zhang, Chuan, and Michael C. Gao. "CALPHAD Modeling of High-Entropy Alloys." In High-Entropy Alloys, 399–444. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27013-5_12.

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Conference papers on the topic "Superalloys High entropy alloys"

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Bridges, D., S. Zhang, S. Lang, M. Gao, Z. Yu, Z. Feng, and A. Hu. "Brazing of Nickel Superalloys Using High Entropy Alloy Bulk Material and Nanopaste." In MS&T17. MS&T17, 2017. http://dx.doi.org/10.7449/2017/mst_2017_968_970.

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Bridges, D., S. Zhang, S. Lang, M. Gao, Z. Yu, Z. Feng, and A. Hu. "Brazing of Nickel Superalloys Using High Entropy Alloy Bulk Material and Nanopaste." In MS&T17. MS&T17, 2017. http://dx.doi.org/10.7449/2017mst/2017/mst_2017_968_970.

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Henderson, M. B., T. J. Ward, G. F. Harrison, and M. Hughes. "Creep and Thermomechanical Fatigue Modelling of Single Crystal Superalloy Turbine Blades." In ASME Turbo Expo 2001: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-gt-0596.

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Abstract:
Gas turbine engine rotor blades are being manufactured increasingly from nickel-based single crystal superalloys. Intended for use in the hottest sections of the turbine, these alloys are capable of providing large increases in component endurance and reliability, as well as engine performance due to increased turbine entry temperature levels. To ensure full utilisation and calculation of safe component life times, accurate modelling of the non-linear deformation suffered during typical duty cycles is needed. The Mechanical Sciences Sector at DERA, Farnborough has developed an anisotropic creep analysis and modelling capability specifically targeted at simulating the high temperature creep and thermomechanical fatigue behaviour of superalloy single crystal specimens and turbine blades under complex loading and non-isothermal conditions. The model has been incorporated into a user material subroutine (UMAT) for use with the ABAQUS finite element programme, within which the inelastic strain is considered to be a combination of the instantaneous plastic strains, time-dependent creep strains and thermal strains. A recent collaborative programme between Alstom Power (UK) and DERA has applied this model to generate predictions for the anisotropic creep and thermomechanical fatigue behaviour of a number of specimen and blade designs.
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Manriquez, J. A., P. L. Bretz, L. Radenberg, and J. K. Tien. "The High Temperature Stability of IN718 Derivative Alloys." In Superalloys. TMS, 1992. http://dx.doi.org/10.7449/1992/superalloys_1992_507_516.

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Deodeshmukh, V. P., and S. K. Srivastava. "Long-Term Cyclic-Oxidation Behavior of Selected High Temperature Alloys." In Superalloys. TMS, 2008. http://dx.doi.org/10.7449/2008/superalloys_2008_689_698.

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Chiou, M., K. Kakehi, C. Kuo, H. Murakami, T. Tsao, A. Yeh, and J. Yeh. "High Temperature Properties of Advanced Directionally-Solidified High Entropy Superalloys." In Superalloys 2016. The Minerals, Metals & Materials Society, 2016. http://dx.doi.org/10.7449/superalloys/2016/superalloys_2016_1001_1009.

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Zhao, D., P. K. Chadhury, R. B. Frank, and L. A. Jackman. "Flow Behavior of Three 625-type Alloys During High Temperature Deformation." In Superalloys. TMS, 1994. http://dx.doi.org/10.7449/1994/superalloys_1994_315_329.

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Penna, C. D. "Development of New Nitrided Nickel-Base Alloys for High Temperature Applications." In Superalloys. TMS, 2000. http://dx.doi.org/10.7449/2000/superalloys_2000_821_828.

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Gu, Y. F., C. Cui, H. Harada, T. Fukuda, D. Ping, A. Mitsuhashi, K. Kato, T. Kobayashi, and J. Fujioka. "Development of Ni-Co-Base Alloys for High-Temperature Disk Applications." In Superalloys. TMS, 2008. http://dx.doi.org/10.7449/2008/superalloys_2008_53_61.

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Bretz, W. "Clad Stainless Steels and High-Ni-Alloys for Welded Tube Application." In Superalloys. John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.7449/2010/superalloys_2010_499_508.

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Reports on the topic "Superalloys High entropy alloys"

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Baker, Ian. Understanding the Deformation Mechanisms of FeNiMnAlCr High Entropy Alloys. Office of Scientific and Technical Information (OSTI), June 2018. http://dx.doi.org/10.2172/1458757.

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Van Duren, Jeroen K., Carl Koch, Alan Luo, Vivek Sample, and Anil Sachdev. High-Throughput Combinatorial Development of High-Entropy Alloys For Light-Weight Structural Applications. Office of Scientific and Technical Information (OSTI), December 2017. http://dx.doi.org/10.2172/1413702.

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Liaw, Peter K., Takeshi Egami, Chuan Zhang, Fan Zhang, and Yanwen Zhang. Radiation behavior of high-entropy alloys for advanced reactors. Final report. Office of Scientific and Technical Information (OSTI), April 2015. http://dx.doi.org/10.2172/1214790.

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Li, Nan. Additive Manufacturing of Hierarchical Multi-Phase High-Entropy Alloys for Nuclear Component. Office of Scientific and Technical Information (OSTI), October 2017. http://dx.doi.org/10.2172/1398940.

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Liaw, Peter, Fan Zhang, Chuan Zhang, Gongyao Wang, Xie Xie, Haoyan Diao, Chih-Hsiang Kuo, Zhinan An, and Michael Hemphill. Experimental and Computational Investigation of High Entropy Alloys for Elevated-Temperature Applications. Office of Scientific and Technical Information (OSTI), July 2016. http://dx.doi.org/10.2172/1337018.

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Vitek, Vaclav. Atomistic Study of the Plastic Deformation of Transition Metals and High Entropy Alloys. Office of Scientific and Technical Information (OSTI), March 2020. http://dx.doi.org/10.2172/1604998.

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Miracle, Daniel B. Critical Assessment 14: High Entropy Alloys and Their Development as Structural Materials (Postprint). Fort Belvoir, VA: Defense Technical Information Center, January 2015. http://dx.doi.org/10.21236/ada626274.

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Baker, Matt. Defining Pathways for Realizing the Revolutionary Potential of High Entropy Alloys: A TMS Accelerator Study. The Minerals, Metals & Materials Society, September 2021. http://dx.doi.org/10.7449/heapathways.

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Rodriguez, Salvador. Application of Refractory High-Entropy Alloys for Higher-Reliability and Higher-Efficiency Brayton Cycles and Advanced Nuclear Reactors. Office of Scientific and Technical Information (OSTI), September 2021. http://dx.doi.org/10.2172/1822585.

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Beausoleil, Geoffrey L., Jeffery A. Aguiar, Seongtae Kwon, Marcus Evan Parry, Danielle Beatty, Bryon J. Curnutt, T. Sparks, and E. Eyerman. Decoding Early Candidacy of High Entropy Alloys for Nuclear Application using the Advanced Test Reactor through Predictive Methods and Combinatorial Testing. Office of Scientific and Technical Information (OSTI), June 2020. http://dx.doi.org/10.2172/1634819.

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