About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
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High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond III
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Presentation Title |
Phase Evolution and Oxidation Study of Combinatorially Designed Hf-Al-Si Refractory Complex Concentrated Alloy for High Temperature Applications |
Author(s) |
Sophia Cooper, Samir M. Aouadi, Andrey A. Voevodin, Anindya Ghoshal, Victoria Blair, Marcus L. Young |
On-Site Speaker (Planned) |
Sophia Cooper |
Abstract Scope |
Refractory complex concentrated alloys (RCCAs) are a unique group of materials defined by shared principality between all alloying elements and the resulting remarkable mechanical properties in high temperature (>1000°C) applications. RCCA systems can be selected using high-throughput processing which allows for simultaneous characterization and testing over a range of compositions. Compositionally graded Hf-Al-Si coatings produced on a Si wafer were compositionally mapped using ESEM with EDS to identify the relative compositions as a function of position on the wafer. The RCCA wafers were subsequently heat treated at various temperatures to investigate any phase changes and oxidation behavior at elevated temperatures. Characterization of the RCCA was performed after heating using ESEM with EDS, XRD, and XPS to identify the microstructure, elemental distribution, phases, and oxidative states present across the alloy as a function of compositional gradient and to determine an alloy composition range with the least amount of high temperature oxidation. |