Effects of Al Content on the Microstructure, Mechanical Properties, and Oxidation Behavior of CoCrNiAlxY Middle Entropy Alloys
Source abstract
Abstract
Developing advanced materials with excellent mechanical properties and high-temperature oxidation performance are important to the potential application in high-temperature structural parts. In the paper, CoCrNiAlxY (x = 0.2, 0.6, 1.0 and 1.4) middle entropy alloys were prepared, and the effects of Al content on the microstructure, mechanical properties and oxidation behavior at 1200 °C of CoCrNiAlxY middle entropy alloys were studied. The phase of CoCrNiAlxY alloys is changing from FCC to BCC with increasing Al content; thereinto, CoCrNiAl0.6Y alloy forms duplex FCC plus BCC phase structure. The hardness and fracture strength of CoCrNiAlxY (x = 0.2, 0.6, 1.0) alloys increase with increasing Al content. When Al content is 1.4, the hardness and fracture strength of CoCrNiAl1.4Y alloy decrease, which result from the tiny variation of alloy microstructure. The oxidation behavior at 1200 °C of CoCrNiAlxY alloys confirms that compact aluminum oxide film can be formed on the CoCrNiAl0.6Y alloy, which slows down the oxidation rate of the alloy. The CoCrNiAl0.6Y alloy has the best oxidation resistance with lower oxidation rate of 1.467 × 10−11 g2/(cm4 s).
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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.
References (38)
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