The oxidation behavior of the CrFeCoNiAlx (x=0, 1.0, and 5.0 wt%) high-entropy alloy synthesized with Al elemental powder via powder bed fusion technique at high temperatures

Article Materials Science, Multidisciplinary

High temperature oxidation behavior of high entropy alloy Al4Co3Cr25Cu10Fe25Ni33 in oxygen-containing atmospheres

Feng-Yi Cho et al.

Summary: High entropy alloys (HEAs) have attracted attention due to their corrosion resistance and mechanical strength. In this study, the oxidation behavior of a new HEA, Al4Co3Cr25Cu10Fe25Ni33, was investigated and it was found that the oxidation kinetics followed a parabolic regime and the activation energy was 178 kJ/mol.

MATERIALS CHEMISTRY AND PHYSICS (2022)

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Article Materials Science, Multidisciplinary

Efficacy of an external chromia layer in reducing nitridation of high temperature alloys

T. Sand et al.

Summary: This study investigates the efficacy of chromia barrier layer against nitrogen ingress in different environments. The presence of an external chromia scale can significantly reduce the nitridation of the alloy, and no nitridation was detected when a continuous alumina layer is present.

CORROSION SCIENCE (2022)

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Article Materials Science, Multidisciplinary

Oxidation mechanism and kinetics of nuclear-grade FeCrAl alloys in the temperature range of 500-1500 °C in steam

Chaewon Kim et al.

Summary: The oxidation mechanism and kinetics of two nuclear-grade FeCrAl alloys were studied in high-temperature steam. The formation kinetics of slow alpha-alumina matched well in the temperature range of 1000°C to 1300°C. Below 1000°C, transient alumina formation resulted in faster kinetics. Excessive Fe-rich oxide formation was observed on the inner surface at 600°C due to surface roughness. Convoluted alpha-alumina was easily spalled at temperatures above 1300°C, causing faster oxidation kinetics. The spallation of oxide led to Cr and Al depletion and catastrophic oxidation above 1400°C, forming Fe-rich oxide with a liquid phase that significantly changed the tube segment geometry.

JOURNAL OF NUCLEAR MATERIALS (2022)

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Article Materials Science, Multidisciplinary

Structural effect of low Al content in the in-situ additive manufactured CrFeCoNiAlx high-entropy alloy

Yulia Kuzminova et al.

Summary: This study investigates the effect of low Al fraction on the microstructure and phase composition of high-entropy alloy, finding that it can decrease porosity and lead to Al-rich precipitates during annealing homogenization.

MATERIALS LETTERS (2021)

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Article Nanoscience & Nanotechnology

Significance of grain refinement on micro-mechanical properties and structures of additively-manufactured CoCrFeNi high-entropy alloy

Wenrui Zhao et al.

Summary: The study highlights the significance of grain refinement achieved through high-pressure torsion on the mechanical properties and structure of AM CoCrFeNi HEA, demonstrating high strain hardening capability and increased plasticity in the nanostructured HEA, with structural evolution showing decreasing crystallite size, increasing microstrain, and expanding lattice parameter. This provides advantages of nanostructuring for current developments in the AM technology of HEAs.

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2021)

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Article Materials Science, Multidisciplinary