Competition between formation of Al2O3 and Cr2O3 in oxidation of Al0.3CoCrCuFeNi high entropy alloy: A first-principles study

Hong, Yu; Kivy, Mohsen Beyramali; Zaeem, Mohsen Asle

doi:10.1016/j.scriptamat.2019.04.041

Cited by 41 publications

(4 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Oxidation studies of the Al x CoCrFeNi system by Butler et al at 1050 • C for 100 h exhibited parabolic oxidation kinetics [15]. If the Al content was high enough, a double-layered oxide structure (Cr 2 O 3 and Al 2 O 3 ) was observed [15], as also confirmed by Hong et al for Al 0.3 CoCrCuFeNi [16].…”

Section: Introductionsupporting

confidence: 52%

High-Temperature Oxidation Behavior of FeCoCrNi+(Cu/Al)-Based High-Entropy Alloys in Humid Air

White,

Bürckner,

Schlereth

et al. 2023

Crystals

View full text Add to dashboard Cite

Previous studies showed some transition metal high-entropy alloy (HEA) compositions can have good oxidation resistance in air up to 800 °C. Four equiatomic HEAs have been developed based on FeCoCrNi with additions of Mn, Cu, Al or Al+Cu. The oxidation behavior of these HEAs was compared in humid (10 vol.% H2O) air at 800 °C for 100–500 h to investigate the influence of water vapor on the oxidation mechanisms. The Cu- and Al-containing alloys exhibited improved oxidation resistance over the Mn composition. For the Cu-containing alloy, a local attack of the Cu-rich phase was observed, which formed an Fe/Ni/Co/Cr spinel that was surrounded by Cr2O3. This oxide was thicker for the humid air atmosphere when compared to dry air, and the transition of the Cu oxide to the spinel was accelerated. The Al-containing HEA formed a thin Al2O3 scale with humidity suppressing AlN formation and forming a smoother oxide layer. The Al+Cu composition had the highest overall oxidation resistance (minimal local attack, no nitridation) and also showed a smooth oxide scale topography under humid air oxidation as opposed to a plate-like, rougher scale under dry air.

show abstract

Section: Introductionsupporting

confidence: 52%

High-Temperature Oxidation Behavior of FeCoCrNi+(Cu/Al)-Based High-Entropy Alloys in Humid Air

White,

Bürckner,

Schlereth

et al. 2023

Crystals

View full text Add to dashboard Cite

show abstract

“…The high-temperature oxidation process of high-entropy alloys is most commonly performed in a vacuum arc furnace [90][91]. High-entropy alloys are also prepared by mechanical alloying [92][93], laser cladding [68,94], magnetron sputtering [95][96][97][98][99], and 3D printing [100]. High-entropy alloys proves the high-temperature oxidation resistance.…”

Section: Effect Of the Preparation Process On High-temperature Oxidation Of High-entropy Alloysmentioning

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

View full text Add to dashboard Cite

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.

show abstract

“…To determine the most favorable surface for hydrogen desorption of HEA TiZrVMoNb hydride, three typical surface orientations are considered [49], i.e., (100), (110) and (111) surfaces. Considering the disordering of metal atoms on TiZrVMoNb hydride, the average surface energies (γ s ) of 40 random configurations for (100), ( 110) and (111) surfaces are calculated to evaluate the surface stability by…”

Section: Surface Energies Of the Clean Hea Tizrvmonb Hydridesmentioning

confidence: 99%

A First-Principles Study of Hydrogen Desorption from High Entropy Alloy TiZrVMoNb Hydride Surface

Zhang

Xiao

et al. 2021

Metals

View full text Add to dashboard Cite

The desorption behaviors of hydrogen from high entropy alloy TiZrVMoNb hydride surface have been investigated using the density functional theory. The (110) surface has been determined to be the most preferable surface for hydrogen desorption from TiZrVMoNb hydride. Due to the high lattice distortion and heterogeneous chemical environment in HEA hydride, hydrogen desorption from the HEA hydride surface is found to be complex. A comparison of molecular and atomic hydrogen desorption reveals that hydrogen prefers to desorb in atomic states from TiZrVMoNb hydride (110) surface rather than molecular states during the hydrogen desorption process. To combine as H2 molecules, the hydrogen atoms need to overcome attractive interaction from TiZrVMoNb hydride (110) surface. These results suggest that the hydrogen desorption on TiZrVMoNb hydride (110) surface is a chemical process. The presented results provide fundamental insights into the underlying mechanism for hydrogen desorption from HEA hydride surface and may open up more possibilities for designing HEAs with excellent hydrogen desorption ability.

show abstract

Competition between formation of Al2O3 and Cr2O3 in oxidation of Al0.3CoCrCuFeNi high entropy alloy: A first-principles study

Cited by 41 publications

References 28 publications

High-Temperature Oxidation Behavior of FeCoCrNi+(Cu/Al)-Based High-Entropy Alloys in Humid Air

High-Temperature Oxidation Behavior of FeCoCrNi+(Cu/Al)-Based High-Entropy Alloys in Humid Air

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

A First-Principles Study of Hydrogen Desorption from High Entropy Alloy TiZrVMoNb Hydride Surface

Contact Info

Product

Resources

About