About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Materials for High Temperature Applications: Next Generation Superalloys and Beyond
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Presentation Title |
Rapid Design of Refractory Multi-principal Element Alloys for High-T Structural Applications: Theory-guided Combinatorial Synthesis and Characterization Approach |
Author(s) |
Gaoyuan Ouyang, Prashant Singh, Ranran Su, Shalabh Gupta, John Perepezko, Jun Cui, Matthew J Kramer, Duane Johnson |
On-Site Speaker (Planned) |
Gaoyuan Ouyang |
Abstract Scope |
Multi-principal element alloys (MPEA) show high promise for next-generation superalloys. By integrating accurate density-functional theory (DFT) theory and high-throughput combinatorial bulk synthesis, characterization, and testing experiments, we scan rapidly MPEA’s large compositional space to down-select alloys with superior mechanical properties and oxidation resistance. Compositions were refined by DFT-based theory that predicts phase stability and mechanical properties for arbitrary MPEAs. Selected samples were then synthesized via combinatorial arc-melting followed by composition and phase verification. Aided by ultrasonic pulse-echo for precise and rapid elastic moduli measurements, we have identified a subset of alloys compositions in the Mo-W-Ta-Ti-Zr system with large moduli (>260 GPa). Oxidation resistance of short-listed samples was improved by adding a self-healing Mo-aluminoborosilica coating, yielding negligible mass change (<2.6 mg/cm2) over 460 cycles (1h/cycle) at 1300°C. Select samples are being tested for creep properties up to 1300°C using our newly designed high-T creep tester via standard small-punch test configuration. |
Proceedings Inclusion? |
Planned: |