Thematische Bibliographien / CrMnFeCoNi

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Auswahl der wissenschaftlichen Literatur zum Thema „CrMnFeCoNi“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 18. Februar 2022

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Zeitschriftenartikel zum Thema "CrMnFeCoNi"

Gadelmeier, Christian, Sebastian Haas, Tim Lienig, Anna Manzoni, Michael Feuerbacher und Uwe Glatzel. „Temperature Dependent Solid Solution Strengthening in the High Entropy Alloy CrMnFeCoNi in Single Crystalline State“. Metals 10, Nr. 11 (23.10.2020): 1412. http://dx.doi.org/10.3390/met10111412.

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The main difference between high entropy alloys and conventional alloys is the solid solution strengthening effect, which shifts from a single element to a multi-element matrix. Little is known about the effectiveness of this effect at high temperatures. Face-centered cubic, equiatomic, and single crystalline high entropy alloy CrMnFeCoNi was pre-alloyed by arc-melting and cast as a single crystal using the Bridgman process. Mechanical characterization by creep testing were performed at temperatures of 700, 980, 1100, and 1200 °C at different loads under vacuum and compared to single-crystalline pure nickel. The results allow a direct assessment of the influence of the chemical composition without any disturbance by grain boundary sliding or diffusion. The results indicate different behaviors of single crystalline pure nickel and CrMnFeCoNi. At 700 °C CrMnFeCoNi is more creep-resistant than Ni, but at 980 °C both alloys show a nearly similar creep strength. Above 980 °C the creep behavior is identical and the solid solution strengthening effect of the CrMnFeCoNi alloy disappears.

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Kang, You Bin, Kap Ho Lee und Sun Ig Hong. „Creep Behaviors of CrMnFeCoNi High Entropy Alloy at Intermediate Temperatures“. Key Engineering Materials 737 (Juni 2017): 21–26. http://dx.doi.org/10.4028/www.scientific.net/kem.737.21.

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In this study, creep properties and fracture behavior of CrMnFeCoNi high entropy alloy (HEA) were studied at intermediate temperatures. The invert-type transient primary creep behaviors were observed in CrMnFeCoNi high entropy alloy. Creep behaviors of HEA are similar to those of class I solid solution alloys. The transient creep curves upon increase of stress by 5MPa in the steady state creep region did not change much except the sudden strain increase. And, no decrease of creep rate was observed upon increase of stress. Instead, the slightly invert transient creep or almost straight creep curves were observed, supporting the high friction stress. CrMnFeCoNi high entropy alloy has a stress exponent of 3.75 and the creep activation energy was calculated to be 278KJ/mole. The fracture strain increased from 1.3 to 1.6 with the decrease of stress from 96 MPa to 48MPa. The lower stress exponent along with the invert type primary creep curves strongly suggest that the creep of CrMnFeCoNi high entropy alloy at 600°C~650°C occurs by a glide controlled process.

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Krapivka, M. O., Yu P. Mazur, M. P. Semen’ko und S. O. Firstov. „Structure of the High-Entropy CrMnFeCoNi and CrMnFeCoNi$_{2}$Cu Alloys and Thermal Stability of Its Electrical Transport Properties“. METALLOFIZIKA I NOVEISHIE TEKHNOLOGII 37, Nr. 6 (17.08.2016): 731–40. http://dx.doi.org/10.15407/mfint.37.06.0731.

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Semen’ko, М. P., Yu P. Mazur und R. V. Ostapenko. „Features Thermomagnetic Behavior of CrMnFeCoNi High Entropy Alloy“. Journal of Nano- and Electronic Physics 8, Nr. 3 (2016): 03029–1. http://dx.doi.org/10.21272/jnep.8(3).03029.

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Peng, Hailong, Yangcenzi Xie, Zicheng Xie, Yunfeng Wu, Wenkun Zhu, Shuquan Liang und Liangbing Wang. „Large-scale and facile synthesis of a porous high-entropy alloy CrMnFeCoNi as an efficient catalyst“. Journal of Materials Chemistry A 8, Nr. 35 (2020): 18318–26. http://dx.doi.org/10.1039/d0ta04940a.

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Porous high entropy alloy CrMnFeCoNi exhibited remarkable catalytic activity and stability toward p-nitrophenol hydrogenation. The enhanced catalytic performance not only resulted from the high surface area, but also from exposed high-index facets with terraces.

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Xiao, L. L., Z. Q. Zheng, S. W. Guo, P. Huang und F. Wang. „Ultra-strong nanostructured CrMnFeCoNi high entropy alloys“. Materials & Design 194 (September 2020): 108895. http://dx.doi.org/10.1016/j.matdes.2020.108895.

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Wu, Z., S. A. David, Z. Feng und H. Bei. „Weldability of a high entropy CrMnFeCoNi alloy“. Scripta Materialia 124 (November 2016): 81–85. http://dx.doi.org/10.1016/j.scriptamat.2016.06.046.

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Fu, Wujing, Wei Zheng, Yongjiang Huang, Fangmin Guo, Songshan Jiang, Peng Xue, Yang Ren, Hongbo Fan, Zhiliang Ning und Jianfei Sun. „Cryogenic mechanical behaviors of CrMnFeCoNi high-entropy alloy“. Materials Science and Engineering: A 789 (Juli 2020): 139579. http://dx.doi.org/10.1016/j.msea.2020.139579.

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Pickering, E. J., R. Muñoz-Moreno, H. J. Stone und N. G. Jones. „Precipitation in the equiatomic high-entropy alloy CrMnFeCoNi“. Scripta Materialia 113 (März 2016): 106–9. http://dx.doi.org/10.1016/j.scriptamat.2015.10.025.

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Laplanche, G., U. F. Volkert, G. Eggeler und E. P. George. „Oxidation Behavior of the CrMnFeCoNi High-Entropy Alloy“. Oxidation of Metals 85, Nr. 5-6 (04.03.2016): 629–45. http://dx.doi.org/10.1007/s11085-016-9616-1.

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Dissertationen zum Thema "CrMnFeCoNi"

Sun, Xun. „Ab initio Investigation of Al-doped CrMnFeCoNi High-Entropy Alloys“. Licentiate thesis, KTH, Materialvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-251330.

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High-entropy alloys (HEAs) represent a special group of solid solutions containing five or more principal elements. The new design strategy has attracted extensive attention from the materials science community. The design and development of HEAs with desired properties have become an important subject in materials science and technology. For understanding the basic properties of HEAs, here we investigate the magnetic properties, Curie temperatures, electronic structures, phase stabilities, and elastic properties of paramagnetic (PM) body-centered cubic (bcc) and face-centered cubic (fcc) AlxCrMnFeCoNi (0 ≤ x ≤ 5, in molar fraction) HEAs using the first-principles exact muffin-tin orbitals (EMTO) method in combination with the coherent potential approximation (CPA) for dealing with the chemical and magnetic disorder. Whenever possible, we compare the theoretical predictions to the available experimental data in order to verify our methodology. In addition, we make use of the previous theoretical investigations carried out on AlxCrFeCoNi HEAs to reveal and understand the role of Mn in the present HEAs. The theoretical lattice constants are found to increase with increasing x, which is in good agreement with the available experimental data. The magnetic transition temperature for the bcc structure strongly decreases with x, whereas that for the fcc structure shows a weak composition dependence. Within their own stability fields, both structures are predicted to be PM at ambient conditions. Upon Al addition, the crystal structure changes from fcc to bcc with a broad two-phase field region, in line with the observations. Bain path calculations suggest that within the duplex region both phases are dynamically stable. Comparison with available experimental data demonstrates that the employed approach describes accurately the elastic moduli of the present HEAs. The elastic parameters exhibit complex composition dependences, although the predicted lattice constants increase monotonously with Al addition. The elastic anisotropy is unusually high for both phases. The brittle/ductile transitions formulated in terms of Cauchy pressure and Pugh ratio become consistent only when the strong elastic anisotropy is accounted for. The negative Cauchy pressure of CrMnFeCoNi is found to be due to the relatively low bulk modulus and C12 elastic constant, which in turn are consistent with the relatively low cohesive energy. Our findings in combination with the experimental data suggest anomalous metallic character for the present HEAs system. The work and results presented in this thesis give a good background to go further and study the plasticity of AlxCrMnFeCoNi type of HEAs as a function of chemistry and temperature. This is a very challenging task and only a very careful pre-study concerning the phase stability, magnetism and elasticity can provide enough information to turn my plan regarding ab initio description of the thermo-plastic deformation mechanisms in AlxCrMnFeCoNi HEAs into a successful research.

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Novotný, David. „Lomové chování kovových slitin s nízkou úrovní houževnatosti“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-442806.

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The diploma thesis is focused on determining mechanical properties of alloys produced by powder metallurgy methods. Two alloys were studied, namely a highly entropic CrMnFeCoNi alloy and an oxide dispersion-strenthened FeAlO alloy. Both alloys were made in laboratory amount of test material and miniature test specimens were used to measure their mechanical properties. The main goal of the diploma thesis was to develop a crack preparation methodology, to examine and to evaluate the properties of miniature test specimens for materials with low levels of resilience. In the analytical part of the thesis, tensile and deformation properties and fracture toughness of both alloys were measured. For the highly-entropic CrMnFeCoNi alloy, the thesis focused on the effect of the strain rate on the properties of the alloy. For the oxide dispersion-strenthened FeAlO, the effect of temperature in the 23-600 °C temperature range on its mechanical properties was studied.

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Liang, Shuen-Shin, und 梁順鑫. „Magnetic Properties of CrMnFeCoNi Multi-Element Nanoparticle“. Thesis, 2006. http://ndltd.ncl.edu.tw/handle/96196351246668505003.

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碩士
國立清華大學
材料科學工程學系
94
In this study, the superhydride(LiB(Et)3H) reducing agent was used to reduce CrCl3, MnCl2, Fe(acac)2, Co(acac)2 and Ni(acac)2 at high temperature to synthesize the MnFe, MnFeCo, MnFeCoNi, and CrMnFeCoNi magnetic nanoparticles, and nanoparticles were dispersed by oleic acid in hexane. The crystal structure of nanoparticles were identified by XRD. It showed that as-prepared nanoparticles were amorphous besides MnFe which appeared peaks of unknown structure. After annealing, MnFe nanoparticles and MnFeCo nanoparticles became the BCC and MnO2 phases. The structure of annealed MnFeCoNi, Mn-rich and Mn-poor nanoparticles were FCC. However, some unknown peaks were observed in Mn-rich nanoparticles annealed at 600°C. The sizes of nanoparticles increased with annealing temperature. According to the LSW theory, the cubed diameter is proportional to the exponential of-Q/RT. For MnFe and Mn-rich nanopartcle, the active energys of the coarsening are 15.8(KJ/mol) and 24.5(KJ/mol) which suit for the surface diffusion. Below the 500°C, the active energy is 13.3(KJ/mol) for Mn-poor nanoparticles, and above the 500°C, it is 311.8(KJ/mol). It is clear that Mn-poor nanoparticles coarsen by surface diffusion at low temperature and by bulk diffusion at high temperature. Form the measurement, magnetic nanoparticles showed low saturated magnetization(Ms), low cohesive field(Hc), and normal susceptibility of the paramagnetic phase in the superparamagnetic region. In the single domain region, there were normal Ms, high Hc, and low susceptibility. In the multi-domain region, there were high Ms, normal Hc and high susceptibility of superparamagnetic phase.

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Gonçalves, Tiago Miguel Curado. „Soldadura TIG da Liga de Alta Entropia CrMnFeCoNi“. Master's thesis, 2019. http://hdl.handle.net/10362/75026.

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Recentemente, as ligas de alta entropia (LAE) têm suscitado a atenção e a curiosidade por parte dos investigadores que se dedicam a esta matéria, devido às suas notáveis caraterísticas e propriedades mecânicas. Estas, podem ter aplicação nas mais diversas áreas, tal como na indústria aerospacial, construção de plataformas petrolíferas, indústria da energia e construção naval. Das diferentes classes existentes de LAE, a CrMnFeCoNi, foi a primeira a ser apresentada e consequentemente, a mais estudada. Deste modo, as LAE estão a surgir como principais substitutas dos aços austeníticos inoxidáveis e dos aços com alto teor de níquel (9%) para aplicações criogénicas. Assim, e por forma a aumentar as potenciais aplicações de qualquer liga de engenharia, existe a necessidade de desenvolver técnicas avançadas de união de materiais. Portanto, existe um grande interesse de promover a união de LAE sem comprometer as suas caraterísticas e propriedades. O presente estudo, incide sobre a produção de cordões de soldadura autogéneos de uma LAE – CrMnFeCoNi, através do processo de soldadura TIG (Tungsten Inert Gas). Os cordões foram avaliados, de forma a compreender o impacto da soldadura nas propriedades microestruturais e mecânicas dos mesmos. Foi possível verificar que a LAE – CrMnFeCoNi apresenta uma boa soldabilidade e não foram observados defeitos. Os resultados obtidos, mostram que, a tensão de cedência (𝜎𝐶) e de rotura (𝜎𝑅), assim como, a ductilidade, são inferiores em comparação com o material base.

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Hsieh, Kang-Tien, und 謝岡典. „First-principles and classical modeling study of the phase stability and phase transformation mechanism of CrMnFeCoNi high-entropy alloy“. Thesis, 2018. http://ndltd.ncl.edu.tw/handle/4u9r84.

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碩士
國立臺灣大學
材料科學與工程學研究所
106
Density functional theory (DFT) and modified embedded atom method (MEAM) are applied in this thesis with aim of investigating the fundamental reasons of phase stability and phase transition process of CrMnFeCoNi quinary high-entropy alloy (HEA). These two atomistic approaches are used in different aspects of researches due to their accuracy and computational demands. In the first part of the thesis, the phase stability of the quinary CrMnFeCoNi, quaternary CrFeCoNi and ternary FeCoCr alloy systems are investigated by DFT static calculations and ab initio molecular dynamics (AIMD). A new idea of reverse Monte Carlo (RMC) method is presented to systematically construct different structures with different local chemical ordering. Quinary CrMnFeCoNi alloy is initially considered as a random solid solution, but phase separation phenomenon is observed in recent studies. Our results show that the experimentally observed phase separation is an enthalpy driven process and the entropy in high-entropy alloys may not be that “high”. We further suggest that the quaternary CrFeCoNi alloy is more stable than its quinary parent and that Mn plays a crucial role in the relative phase stability of the quinary alloy. Futhermore, the local chemistry ordering may greatly affect the stacking fault energies of the system. The lacking of proper atomistic potential model can greatly prohibit the outgrowth of material studies. In the second part of the thesis, a set of MEAM parameters is developed and validated. When comparing with the results of existing parameters, our results show better agreement with ab initio calculations and experimental values. The FCC-to-HCP phase transformation during high-pressure compression is investigated by large scale molecular dynamics (MD). The results suggest that the locally anisotropic pressure can activate FCC-to-HCP phase transformation while hydrostatic pressure cannot. Among <001>, <011> and <111> directions, the stress applied on <001> is the most effective in turning FCC into HCP, reaching a 66% transformation. An extra mechanism is found to be responsible for this stacking fault mediated phase transformation process. Moreover, by biaxial compression with and without free surface, we suggest that the homogeneous nucleation of dislocations plays a more important role than heterogeneous nucleation in FCC-to-HCP phase transformation for Cantor alloy.

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