High-Temperature Oxidation Behaviours of AlCoCrFeNi High-Entropy Alloy at 1073–1273 K

Zhu, Jinyang; Lu, S. F.; Jin, Ying; Xu, Lining; Xu, Xiaodong; Yin, Chengxian; Jia, Yi Su

doi:10.1007/s11085-020-09991-6

Cited by 29 publications

(16 citation statements)

References 25 publications

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“…According to other research data [21], the mass gain in CoCrCuFeNi and Al 0.5 CoCrCuFeNi after 10 h at 1000°C is 0.49 and 0.28 mg/cm 2 , respectively. If we compare our results with those reported elsewhere [24] we can see that Al 0.25 CoCrFeNiCu is less stable than Al 0.3 CoCrFeNi: their mass gain after 10 h at 900°C is 1.0 and 0.5 mg/cm 2 , respectively, though such differences of the data can be explained by the difference of the research techniques. In particular, according to another study [32], doping AlCoCrFeNi with Cu and increasing its content have a positive impact on the oxidation stability of the alloy at 1000°C.…”

Section: Resultssupporting

confidence: 65%

“…Thus, the test HEAs differ greatly in oxidation stability at 900°C. The high oxidation resistance of Al research results is with those on high-temperature oxidation of dopant-free AlCoCrFeNi systems [18,23,24]. From these related results it follows that the mass gain in AlCoCrFeNi aged at 1050°C varies from 0.07 to 0.40 mg/cm 2 after 1 h and from 0.45 to 0.85 mg/cm 2 after 5 h, depending on the Al content [18].…”

Section: Resultsmentioning

confidence: 64%

“…In Al x CoCrFeNi at 900-1100°C, for example, the oxidation resistance increases with increasing the Al content and mostly due to Al 2 O 3 [21][22][23]. From comparison of high-entropy alloys AlCoCrFeNi, nickel alloy 825, and duplex stainless steel 2205 it follows that the HEA systems have the highest Cr content in their oxide films at 1000°C against the same Cr content in the alloy matrices and that the highest oxidation resistance is found in AlCoCrFeNi and the lowest one in duplex steel 2205 [24].…”

Section: Introductionmentioning

confidence: 94%

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High-Temperature Oxidation Behavior of AlxCoCrFeNiM (M = Cu, Ti, V) High-Entropy Alloys

et al. 2021

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High-entropy alloys (HEAs) feature a unique combination of mechanical and physical properties, such as high strength and ductility, high hardness and wear resistance, high thermal stability, suggesting that HEAs are suitable for operation under severe conditions (gas turbines, jet and turbojet engines, etc.). In this context, it is reasonable to assess the resistance of HEAs to high-temperature oxidation. Here, we present theoretical and experimental data on the behavior of three HEAs (Al x CoCrFeNiM with M = Cu, Ti, V) oxidized in air at 900°C for 10 h and discuss the possibility of thermodynamic simulation for predicting the composition of their oxidation products. Our study of the microstructure of the test HEAs before and after oxidation, composition of their oxidation products, and oxidation kinetics shows that Al 0.25 CoCrFeNiCu has the highest stability to high-temperature oxidation due to the formation of a protective Al 2 O 3 -rich film on its surface. The oxidation stability of the Ti-and V-doped alloys is rather low and likely because their surface during oxidation is covered with loose layers of transition metal oxides rather with a continuous alumina film.

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Section: Resultssupporting

confidence: 65%

Section: Resultsmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 94%

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High-Temperature Oxidation Behavior of AlxCoCrFeNiM (M = Cu, Ti, V) High-Entropy Alloys

et al. 2021

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“…The isothermal oxidation behavior has been examined relatively thoroughly in Al-Co-Cr-Fe-Ni system. In particular, the influence of Al content on oxidation behavior and oxidation kinetics at various temperatures has been elaborated in multiple studies [20][21][22][23][24]. It is worth noting that despite a complete lack of studies dedicated to the oxidation behavior of this group of HEAs under thermal-cycling conditions, their behavior in isothermal conditions already shows a profound tendency toward scale spallation during cooling [6,21], a quality disqualifying for practically all real-life applications.…”

Section: Introductionmentioning

confidence: 99%

Oxidation Behavior of Alx(CoCrFeNi)100-x High-Entropy Alloys Under Thermal-Cycling Conditions

et al. 2021

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The oxidation behavior of five different high-entropy alloys from the Al–Co–Cr–Fe–Ni metallic system, namely Alx(CoCrFeNi)100-x (x = 0; 3; 6; 9; 12), was studied under thermal-cycling conditions, at 1273 K in air atmosphere. The choice of selected compositions allowed for covering the chromia-to-alumina former transition, as well as the transition from the FCC single-phase solid solution structure to multiphase alloys with Al-enriched B2-structured constituent. The measurements were taken for 500 cycles (1 cycle - 1 h of heating, 20 min of cooling). The results indicate a profound influence of the thermal-cycling conditions on the oxidation products, with extremely complex scale structures and extensive internal oxidation and nitridation zones, as well as severe spallation of the oxide scale in most cases, showing the limited usefulness of these alloys for high-temperature applications at the current stage of their development.

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“…After 25 h of oxidation, the oxide layer primarily consists of α-Al 2 O 3 and Cr 2 O 3 . Previous experimental reports on high-temperature oxidation of AlCoCrFeNi HEA indicate the same [ 37 , 38 , 45 ]. Butler et al [ 37 ] reported an external chromia layer, followed by an internal Alumina, after 50 h of oxidation of equimolar AlCoCrFeNi alloy at 1323 K (1050 °C).…”

Section: Resultsmentioning

confidence: 59%

Modeling Oxidation of AlCoCrFeNi High-Entropy Alloy Using Stochastic Cellular Automata

Roy

Ray

Balasubramanian

2022

Entropy

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Together with the thermodynamics and kinetics, the complex microstructure of high-entropy alloys (HEAs) exerts a significant influence on the associated oxidation mechanisms in these concentrated solid solutions. To describe the surface oxidation in AlCoCrFeNi HEA, we employed a stochastic cellular automata model that replicates the mesoscale structures that form. The model benefits from diffusion coefficients of the principal elements through the native oxides predicted by using molecular simulations. Through our examination of the oxidation behavior as a function of the alloy composition, we corroborated that the oxide scale growth is a function of the complex chemistry and resultant microstructures. The effect of heat treatment on these alloys is also simulated by using reconstructed experimental micrographs. When they are in a single-crystal structure, no segregation is noted for α-Al2O3 and Cr2O3, which are the primary scale-forming oxides. However, a coexistent separation between Al2O3 and Cr2O3 oxide scales with the Al-Ni- and Cr-Fe-rich regions is predicted when phase-separated microstructures are incorporated into the model.

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High-Temperature Oxidation Behaviours of AlCoCrFeNi High-Entropy Alloy at 1073–1273 K

Cited by 29 publications

References 25 publications

High-Temperature Oxidation Behavior of AlxCoCrFeNiM (M = Cu, Ti, V) High-Entropy Alloys

High-Temperature Oxidation Behavior of AlxCoCrFeNiM (M = Cu, Ti, V) High-Entropy Alloys

Oxidation Behavior of Alx(CoCrFeNi)100-x High-Entropy Alloys Under Thermal-Cycling Conditions

Modeling Oxidation of AlCoCrFeNi High-Entropy Alloy Using Stochastic Cellular Automata

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