Oxidation Behavior of (AlCoCrFeNi)92(TiC)8 High-Entropy Alloy at Elevated Temperatures
Source abstract
Abstract
(AlCoCrFeNi)92(TiC)8 high-entropy alloy (HEA) was prepared by arc-melting to investigate the microstructure and high-temperature oxidation behavior using x-ray diffractometer (XRD) and scanning electron microscopy (SEM). The XRD pattern showed that the prepared alloy was composed of a mixture of BCC, B2, σ, and TiC phases. Oxidation kinetics of (AlCoCrFeNi)92(TiC)8 HEAs at 1073, 1173, and 1273 K in air confirmed parabolic kinetics, and the oxidation resistance decreased with the temperature increment. XRD and SEM analyses clearly indicated that a mixture of α-Al2O3, θ-Al2O3, and TiO2 was identified as predominant oxides for alloys oxidized at 1073 and 1173 K, while the main oxides were composed of α-Al2O3 and TiO2 for alloys oxidized at 1273 K. The (AlCoCrFeNi)92(TiC)8 alloy oxidized at 1273 K exhibited about 0.79 mg cm−2 weight gain after 50 h, while this value was about 0.11 mg cm−2 for alloys oxidized at 1073 K. The superior oxidation resistance to high temperature was mainly attributed to the formation of a continuous and compact Al2O3 scale on the surface of the alloys. The whole oxide formation process was discussed based on the oxide precipitates analysis. The excellent oxidation resistance suggests that this alloy can be applied as a potential candidate for high-temperature materials.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: High Entropy Alloys Studies · High-Temperature Coating Behaviors · Advanced materials and composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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