In Situ ESEM Investigation of KCl-Induced Corrosion of a FeCrAl and a Model FeNiCrAl Alloy in Lab Air at 450°C

Mortazavi, N.; Intiso, Luciana; Israelsson, Niklas; Johansson, Lars‐Gunnar; Halvarsson, Mats

doi:10.1149/2.0581514jes

Cited by 11 publications

(9 citation statements)

References 50 publications

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“…In the case of the Al 0.9 FeCrCoNi CCA oxidised at 900°C, the XRD pattern displayed peaks that could be assigned to Al 2 O 3 , with the corundum structure, and AlN. The peaks showing the characteristics of FCC, BCC, and B2 phases were sourced by the substrate and XRD disclosed the formation of the Sigma phase in the Al 0.9 FeCrCoNi CCA both at 700 and 900°C, which is an expected observation 32 .…”

Section: Post-exposure Analysissupporting

confidence: 51%

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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Section: Post-exposure Analysissupporting

confidence: 51%

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

et al. 2020

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“…Materials testing and material changes is mainly studied ex situ after the reaction was finished by various microscopic techniques such as optical microscopy (OM), electron microprobe analysis (EMPA), scanning or transmission electron microscopy (SEM and TEM), and X‐ray diffraction (XRD). Comprehensive efforts were made to study material changes of high temperature alloys under oxidizing and reducing atmospheres in real time via environmental scanning electron microscopy or in situ TEM techniques . Concerning the possibility of applying highly corrosive and toxic gases such as SO 2 during in situ analytics, microscopic techniques are very limited.…”

Section: Introductionmentioning

confidence: 99%

Real time observation of high temperature oxidation and sulfidation of Fe‐Cr model alloys

Stephan-Scherb

Nützmann

Kranzmann

et al. 2018

Materials & Corrosion

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Insights into early damage mechanisms during high‐temperature gas corrosion provide important aspects for the prediction of the long‐term stability of high‐temperature materials exposed to a hot and corrosive environment. The current work presents a real time study concerning the combined oxidation and sulfidation of ferritic model alloys in a hot SO2 containing atmosphere using energy dispersive X‐ray diffraction. The applied high temperature reactor allows the transmittance of high energetic X‐rays in order to collect X‐ray diffraction pattern of the sample surface in situ during the reaction with the reactive environment. The results revealed that the first phases crystallizing on iron with 2 wt% chromium and with 9 wt% chromium are oxides. The aging experiments at T = 650° C with 0.5% SO2 and 99.5% Ar were followed in situ and caused an external mixed oxide‐sulfide layer on top of iron with 2 wt% chromium. On the higher alloyed material the external scale consists of iron oxides and the inner scale of mixed (Fe,Cr)‐oxides and chromium‐sulfides. The oxide content continuously increases parallel to an increase of the sulfide amount. Thus, the initially formed (Fe,Cr)‐oxides do not have a protective character and support the transport of sulfur through the growing oxide scale.

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“…Following the TGA experiments, the cross-section of the CCAs were mounted, ground and polished using the procedure described in [23,24] and is shortly described here. The crosssection of the CCAs were mounted, ground and polished using diamond suspensions towards a 1 µm and then 0.25 µm mirror-like finish on a Buehler Microcloth® for 15-35 minutes.…”

Section: Methodsmentioning

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

In Situ ESEM Investigation of KCl-Induced Corrosion of a FeCrAl and a Model FeNiCrAl Alloy in Lab Air at 450°C

Cited by 11 publications

References 50 publications

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

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

Real time observation of high temperature oxidation and sulfidation of Fe‐Cr model alloys

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

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