The oxidation behavior of a Ni2FeCoCrAl0.5 high-entropy superalloy in O2-containing environments

Kai, Wu; Cheng, F.P.; Chien, F.C.; Lin, Yu-Ting; Chen, D.; Kai, Ji‐Jung; Liu, C.T.; Wang, C.J.

doi:10.1016/j.corsci.2019.108093

Cited by 29 publications

(11 citation statements)

References 22 publications

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“…However, the chemical composition obtained from a dark shape located at greater depths suggests that aluminium nitride precipitates form at certain places inside the substrate. These findings concerning internal AlN formation are more in accordance with the results presented in literature 19,22,30) than the previous case.…”

Section: Resultssupporting

confidence: 93%

“…Aluminium nitride formation in such alloys during prolonged exposure to air at high temperatures is in accordance with the results obtained for AlCoCrFeNi systems in previous works. 19,22,30) However, in those cases, aluminium and nitrogen-containing precipitates were found deeper inside the substrate. Not much is currently known concerning the exact mechanism of internal nitridation at high temperatures in such systems and the reason for AlN being located at the scale/substrate interface in the case of Al 20 Co 5 Cr 20 Fe 20 Ni 35 as opposed to the substrate interior is currently unknown.…”

Section: Resultsmentioning

confidence: 97%

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Behaviour of Nickel-Rich Non-Equimolar High Entropy Alloys in High-Temperature Oxidizing Conditions

2022

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This study aims to compare the behaviour of two Ni-rich non-equimolar AlCoCrFeNi high entropy alloys, i.e. Al 20 Co 5 Cr 20 Fe 20 Ni 35 and Al 10 Co 15 Cr 20 Fe 20 Ni 35 (at%) in isothermal high-temperature oxidizing conditions. In both cases, mass gain after 100-hr oxidation at 1173 K in synthetic air atmosphere does not exceed 1 mg/cm 2 , indicating good resistance against the corrosive environment. Investigations on the morphology, chemical and phase composition of the alloys after the oxidation process indicate that a mixture of Al 2 O 3 and Cr 2 O 3 is responsible for the protective properties of the scale formed on Al 20 Co 5 Cr 20 Fe 20 Ni 35 , whereas an additional chromiumironnickelcobalt spinel structure was determined on the Al 10 Co 15 Cr 20 Fe 20 Ni 35 sample after prolonged exposure to the above-mentioned conditions. The oxidation kinetics are slightly better in the case of Al 20 Co 5 Cr 20 Fe 20 Ni 35 and lower amounts of the remaining constituent elements were detected in the protective scale compared to Al 10 Co 15 Cr 20 Fe 20 Ni 35 . Furthermore, the Al 20 Co 5 Cr 20 Fe 20 Ni 35 substrate was able to maintain its initial morphology throughout the entire alloy after the corrosion process. From all of the above, it can be concluded that Al 20 Co 5 Cr 20 Fe 20 Ni 35 seems to demonstrate better oxidation properties at a high temperature than Al 10 Co 15 Cr 20 Fe 20 Ni 35 .

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 97%

Behaviour of Nickel-Rich Non-Equimolar High Entropy Alloys in High-Temperature Oxidizing Conditions

2022

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“…The higher the partial pressure of the CO 2 /CO gas mixture corresponds to the faster the oxidation rate at the same temperature. When the partial pressure of the CO 2 /CO gas mixture was the same, the higher the temperature was, the faster the oxidation rate was [44]. The oxidation kinetics curve of the Ni 2 FeCoCrAl 0.5 high-entropy alloy is shown in Fig.…”

Section: Main Factors Of High-temperature Oxidation 21 Influence Of the Service Environment On The Hightemperature Oxidation Of A High-enmentioning

confidence: 99%

Influencing factors and mechanism of high-temperature oxidation of high-entropy alloys: A review

Pan

et al. 2021

Int J Miner Metall Mater

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High-temperature oxidation is a common failure in high-temperature environments, which widely occur in aircraft engines and aerospace thrusters; as a result, the development of anti-high-temperature oxidation materials has been pursued. Ni-based alloys are a common high-temperature material; however, they are too expensive. High-entropy alloys are alternatives for the anti-oxidation property at high temperatures because of their special structure and properties. The recent achievements of high-temperature oxidation are reviewed in this paper. The high-temperature oxidation environment, temperature, phase structure, alloy elements, and preparation methods of high-entropy alloys are summarized. The reason why high-entropy alloys have anti-oxidation ability at high temperatures is illuminated. Current research, material selection, and application prospects of high-temperature oxidation are introduced.

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“…Senkov, Isheim [55] and Li, Lee [65] tested AlMo 0.5 NbTa 0.5 TiZr HESA by powder metallurgy and they all observed that the superalloy possessed high thermal stability and yield strength superior to nickel superalloys at 1200 C°. Kai, Cheng [66] examined the oxidation behavior of a HESA in O 2 environments. The Ni 2 FeCoCrAl 0.5 HESA oxidation kinetics at 900 C° followed a parabolic-rate law forming scales which was dependent on the oxygen pressure.…”

Section: High Entropy Superalloys (Hesas)mentioning

confidence: 99%

Recent Advances of High Entropy Alloys: High Entropy Superalloys

Dada¹,

Popoola²,

Mathe³

et al. 2021

Advances in High-Entropy Alloys - Materials Research, Exotic Properties and Applications

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The oxidation behavior of a Ni2FeCoCrAl0.5 high-entropy superalloy in O2-containing environments

Cited by 29 publications

References 22 publications

Behaviour of Nickel-Rich Non-Equimolar High Entropy Alloys in High-Temperature Oxidizing Conditions

Behaviour of Nickel-Rich Non-Equimolar High Entropy Alloys in High-Temperature Oxidizing Conditions

Influencing factors and mechanism of high-temperature oxidation of high-entropy alloys: A review

Recent Advances of High Entropy Alloys: High Entropy Superalloys

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