The corrosion of an equimolar FeCoNiCrMn high-entropy alloy in various CO2/CO mixed gases at 700 and 950 °C

Kai, Wu; Chien, F.C.; Cheng, F.P.; Huang, Ruey‐Shing; Kai, Ji‐Jung; Liu, C.T.

doi:10.1016/j.corsci.2019.03.030

Cited by 29 publications

(20 citation statements)

References 21 publications

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“…These results are consistent with those reported by other authors [17,20,23] [19,21], MnO may quickly oxidize to Mn 3 O 4 and Mn 2 O 3 , which is the reason why it is not detected here. From a kinetic point of view, different groups [11,13] showed that Mn diffuses by about one order of magnitude faster than Cr in the CrMn-FeCoNi HEA.…”

Section: Thermodynamic Boundary Conditionssupporting

confidence: 94%

“…Moreover, the short above-mentioned review on oxidation of MEAs and HEAs from the Cr-Mn-Fe-Co-Ni system showed that the mechanisms controlling the high-temperature corrosion and protection of the CrMnFeCoNi and CrCoNi alloys are not fully understood yet and are mainly focused on oxidation in dry air. As already stated by Kai et al [20], a broader knowledge of oxidation mechanisms in dry and humid low p O2 -containing atmospheres is required to use the CrMnFeCoNi HEA and its equiatomic subsystems for high-temperature applications. Here, materials are exposed to service environments, where the equilibrium oxygen partial pressure is smaller compared to that of air.…”

Section: Introductionmentioning

confidence: 98%

“…To further investigate the applicability of these alloys for high-temperature applications in harsh environments, various groups studied the oxidation behavior of these alloys in (dry) laboratory and artificial air as well as CO 2 /CO mixtures at different temperatures up to 1000 °C [17][18][19][20][21][22][23]. Laplanche et al [17] investigated the isothermal oxidation behavior of CrMnFeCoNi in the range [600-900 °C] in laboratory air for times up to 100 h. Thermogravimetric analyses revealed an initially linear oxidation rate that became parabolic after longer times.…”

Section: Introductionmentioning

confidence: 99%

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High-Temperature Oxidation in Dry and Humid Atmospheres of the Equiatomic CrMnFeCoNi and CrCoNi High- and Medium-Entropy Alloys

et al. 2020

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Surface degradation phenomena of two model equiatomic alloys from the CrMnFeCoNi alloy system were investigated in 2% O2 and 10% H2O (pO2 = 0.02 and 10−7 atm, respectively) at 800 °C for times up to 96 h. The crystallographic structures, morphologies, and chemical compositions of the corrosion layers developing on CrMnFeCoNi and CrCoNi were comparatively analyzed by mass gain analysis, X-ray diffraction, and scanning electron microscopy combined with energy-dispersive X-ray spectroscopy and electron backscatter diffraction. The oxidation resistance of CrMnFeCoNi is relatively poor due to the fast growth of porous Mn-oxide(s). CrCoNi forms an external chromia layer that is dense and continuous in a dry 2% O2 atmosphere. This layer buckles and spalls off after exposure to 10% H2O atmosphere. Beneath the chromia layer, a Cr-depleted zone forms in the CrCoNi alloy in both environments. As the oxide scale spalls off in the H2O-containing atmosphere, a secondary chromia layer was observed and correspondingly enlarges the Cr-depleted zone. In contrast, as the chromia layer remains without significant spallation when CrCoNi is exposed to a dry oxidizing atmosphere, the region depleted in Cr is narrower. Graphic Abstract

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Section: Thermodynamic Boundary Conditionssupporting

confidence: 94%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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High-Temperature Oxidation in Dry and Humid Atmospheres of the Equiatomic CrMnFeCoNi and CrCoNi High- and Medium-Entropy Alloys

et al. 2020

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“…While CCAs exhibit sufficiently high melting points and phase stability for demanding applications, they, however remain dependent on the formation of a reliable protective oxide scale for continuity of usage, which is no different from "traditional" Febase and Ni-base alloys. At present, there is insufficient knowledge regarding the high-temperature oxidation behaviour of CCAs more generally, with relatively few studies reported such properties [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] . An overview of the limited research within the context of oxidation of CCAs at temperatures ranging from 500 to 1200°C is provided in Table 1.…”

Section: Introductionmentioning

confidence: 99%

High-temperature oxidation behaviour of AlxFeCrCoNi and AlTiVCr compositionally complex alloys

et al. 2020

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Compositionally complex alloys (CCAs), also termed as high entropy alloys (HEAs) or multi-principal element alloys (MPEAs), are being considered as a potential solution for many energy-related applications comprising extreme environments and temperatures. Herein, a review of the pertinent literature is performed in conjunction with original works characterising the oxidation behaviour of two diverse Al-containing alloys; namely a lightweight (5.06 g/cm 3) single-phase AlTiVCr CCA and a multiple-phase Al 0.9 FeCrCoNi CCA (6.9 g/cm 3). The thermogravimetric results obtained during oxidation of the alloys at 700 and 900°C revealed that both alloys tended to obey the desired parabolic rate law. Post-exposure analysis by means of electron microscopy indicated that while the oxide scale formed on the AlTiVCr is adherent to the substrate, the scale developed on the Al 0.9 FeCrCoNi displays a notable spalling propensity. This study highlights the need for tailoring the protective properties of the oxide scale formed on the surface of the CCAs.

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“…While CCAs exhibit sufficiently high melting points and phase stability for demanding applications, they however remain dependent on the formation of a reliable protective oxide scale for continuity of usage, which is no different to "traditional" Fe-and Ni-base alloys. At present, there is insufficient knowledge regarding high-temperature oxidation behaviour of CCAs more generally, with relatively few studies reported such properties [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. A literature survey of the limited research within the context of oxidation of CCAs at temperatures ranging from 500 to 1200°C is provided in Table 1.…”

Section: Introductionmentioning

confidence: 99%

High-temperature oxidation behaviour of AlxFeCrCoNi and AlTiVCr compositionally complex alloys

Esmaily¹,

Qiu²,

Bigdeli³

et al. 2020

Preprint

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Compositionally complex alloys (CCAs), also termed as high entropy alloys (HEAs) or multiprincipal element alloys (MPEAs), are being considered as a potential solution for many energyrelated applications comprising extreme environments and temperatures. Herein, a review of the pertinent literature is performed in conjunction with original works characterising the oxidation behaviour of two "opposing" alloys; namely a lightweight (5.06 g/cm 3 ) single-phase AlTiVCr CCA and a multiple-phase Al0.9FeCrCoNi CCA (6.9 g/cm 3 ). The thermogravimetric results obtained during oxidation of the alloys at 700 and 900°C revealed that while AlTiVCr revealed linear oxidation, Al0.9FeCrCoNi tended to obey the desired parabolic rate law. However, postexposure analysis by means of electron microscopy indicated that while the oxide scale formed on the AlTiVCr is adherent to the substrate, the scale developed on the Al0.9FeCrCoNi displays a notable spalling propensity. This study highlights the need for tailoring the protective properties of the oxide scale formed on the surface of the CCAs.

show abstract

The corrosion of an equimolar FeCoNiCrMn high-entropy alloy in various CO2/CO mixed gases at 700 and 950 °C

Cited by 29 publications

References 21 publications

High-Temperature Oxidation in Dry and Humid Atmospheres of the Equiatomic CrMnFeCoNi and CrCoNi High- and Medium-Entropy Alloys

High-Temperature Oxidation in Dry and Humid Atmospheres of the Equiatomic CrMnFeCoNi and CrCoNi High- and Medium-Entropy Alloys

High-temperature oxidation behaviour of AlxFeCrCoNi and AlTiVCr compositionally complex alloys

High-temperature oxidation behaviour of AlxFeCrCoNi and AlTiVCr compositionally complex alloys

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