Oxidation and Corrosion resistance of AlCoCrFeTiHigh Entropy Alloy

Raphel, Arun; Kumaran, S.; Kumar, K.V. Pradeep; Varghese, Lovin

doi:10.1016/j.matpr.2017.01.013

Cited by 29 publications

(5 citation statements)

References 17 publications

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“…The behaviour in the HEA-based cermet is three times superior. Similar behaviour can be found in [54] wherein in addition to the electrochemical corrosion, oxidation was studied. A unique study on a refractory HEA (C7 cluster) made by additive manufacturing can be found in [171].…”

Section: Special Properties Of Pm Heassupporting

confidence: 79%

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High-entropy alloys fabricated via powder metallurgy. A critical review

2019

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High-entropy alloys (HEAs) have attracted a great deal of interest over the last 14 years. One reason for this level of interest is related to these alloys breaking the alloying principles that have been applied for many centuries. Thus, HEAs usually possess a single phase (contrary to expectations according to the composition of the alloy) and exhibit a high level of performance in different properties related to many developing areas in industry. Despite this significant interest, most HEAs have been developed via ingot metallurgy. More recently, powder metallurgy (PM) has appeared as an interesting alternative for further developing this family of alloys to possibly widen the field of nanostructures in HEAs and improve some capabilities of these alloys. In this paper, PM methods applied to HEAs are reviewed, and some possible ways to develop the use of powders as raw materials are introduced.

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Section: Special Properties Of Pm Heassupporting

confidence: 79%

“…Considering the HEAs in [32,52,54,104], all of them belong to compositional clusters C1 and C2 made by conventional PM. Electrochemical corrosion is tested through potentiodynamic polarisation curves, and better performance than that of stainless steel 304 was observed in all of these works.…”

Section: Corrosion and Oxidationmentioning

confidence: 99%

High-entropy alloys fabricated via powder metallurgy. A critical review

2019

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“…Consequently, this transformation yields a superior ZT of 0.84 at 573 K. 260 Recently, they incorporated Ag with different concentrations (0-0.9 at%) into a nanocrystalline lead tin tellurium selenium (PbSnTeSe). 261 They combined the entropydriven concept, band engineering, and nanostructuring techniques, resulting in a significant reduction in k, achieving an exceptionally low value of 0.814 W m À1 K À1 . This reduction leads to a substantial enhancement in the PF, reaching 14.16 Â 10 À4 W m À1 K À2 and a remarkable ZT of 0.891 at 573 K for the nanostructured PbSnTeSe-0.9Ag HEM, representing a remarkable 225% improvement compared to the pristine PbSnTeSe HEA.…”

Section: High-entropy Metal Chalcogenidesmentioning

confidence: 99%

“…This reduction leads to a substantial enhancement in the PF, reaching 14.16 Â 10 À4 W m À1 K À2 and a remarkable ZT of 0.891 at 573 K for the nanostructured PbSnTeSe-0.9Ag HEM, representing a remarkable 225% improvement compared to the pristine PbSnTeSe HEA. 261 Xin et al 262 also applied the entropy-driven concept on the (Pb, Sn)(Se, Te) system. They found a ZT value of 0.85 at 773 K for the Sn 0.61 Mn 0.09 Pb 0.3 Te 0.7 Se 0.3 HEM, which has increased 113% compared to that of the original SnTe-based TE material, accompanied by an ultralow k l of 0.48 W cm À1 K À1 at 773 K, which has been obtained via the phonon scattering of the configurational entropy.…”

Section: High-entropy Metal Chalcogenidesmentioning

confidence: 99%

High-entropy materials for thermoelectric applications: towards performance and reliability

Oueldna,

Sabi,

Aziam

et al. 2024

Mater. Horiz.

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“…At 1000°C, the thickness measurements were not precise due to oxide spallation and continuous scale did not form [62]. fit a linear rate with 0.029 mg/cm 2 h and 0.059 mg/cm 2 h at 850°C and 950°C respectively, indicating that the oxidation rate increases with increasing temperature [84].…”

Section: Oxidation Of Heas In Airmentioning

confidence: 99%

Investigation of Oxidation Performance of Co-Cr-Fe-Ni based High Entropy Alloys in Supercritical-CO2 Environment

Ilinich

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This work presents the first oxidation studies of Co-Cr-Fe-Ni-based high entropy alloys (HEAs) in supercritical-CO2 (sCO2) environment. These materials are being evaluated as an alternative to commercial Ni-based superalloys for construction of select components of sCO2 power cycles. The alloys investigated in this research include CoCrFeMnNi, Al0.5CoCrFeMnNi1.5, Al0.5CoCrFeNi1.5, (CoCrFeMnNi)Si0.01, and CoCrFe0.5MnNi1.5 specifically designed to study the impact of Mn, Al, Si and Fe on the oxidation behaviour. The HEAs were characterized through scanning electron microscopy (SEM), energy-dispersive Xray spectroscopy (EDS), X-ray diffraction before and after exposure to sCO2. The samples were tested inside a high pressure sCO2 corrosion test rig located at Natural Resources Canada's, capable of mimicking the operating conditions of indirectly-fired sCO2 power cycles. The oxidation behaviour was evaluated by comparing experimentally obtained mass gain data and the characterized oxide formations. The pre-exposure results show that Al0.5CoCrFeMnNi1.5 and Al0.5CoCrFeNi1.5 compositions form γ/γ' microstructure, desirable for high strength applications, while the exposure to sCO2 at elevated temperatures (500-700°C) and pressure (20 MPa) causes formation of ordered B2 NiAl phases dispersed within the matrix. Al0.5CoCrFeNi1.5 is the only composition that forms detectable protective Cr2O3 after 300 hours at 500°C/20MPa, as well as after 600 hours at 700°C/MPa. The other four compositions were shown to form a porous unprotective MnO oxide layer. Additionally, the results indicate that similar to conventional alloy systems, the oxidation of HEAs increases with temperature, however, Al0.5CoCrFeNi1.5 exhibited nearly the same mass gain at both temperatures after 300 and 600 hours. Lastly, the results suggest that Al0.5CoCrFeNi1.5 composition has the potential to outperform commercial superalloys in sCO2 applications.

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Oxidation and Corrosion resistance of AlCoCrFeTiHigh Entropy Alloy

Cited by 29 publications

References 17 publications

High-entropy alloys fabricated via powder metallurgy. A critical review

High-entropy alloys fabricated via powder metallurgy. A critical review

High-entropy materials for thermoelectric applications: towards performance and reliability

Investigation of Oxidation Performance of Co-Cr-Fe-Ni based High Entropy Alloys in Supercritical-CO2 Environment

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