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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Simulations/Experiments Integration for Next Generation Hypersonic Materials
Presentation Title Computational Discovery and Experimental Validation of Ultra-high Strength BCC Refractory Metal-based MPEAs for Extreme Environments
Author(s) Kate L. M. Elder, Joel Berry, Aurelien Perron, Brandon Bocklund, Hunter Henderson, Jibril Shittu, Connor Rietema, Zachary Sims, Scott McCall, Joseph McKeown
On-Site Speaker (Planned) Kate L. M. Elder
Abstract Scope Body centered cubic (BCC) refractory metal-based multi-principal element alloys (MPEAs) are known for maintaining high yield strength at elevated temperatures, an important property for operation in extreme aerodynamic and aerothermal conditions. To exploit the enhanced mechanical properties, tailored MPEAs are needed with both strength and BCC stability sufficient for a given service requirement. However, strength and stability vary drastically with temperature, number of elements, and composition of elements. Through analytical calculations, we investigate virtually all MPEAs from the Al-Cr-Fe-Hf-Mo-Nb-Ta-Ti-V-W-Zr family with up to eleven elements to identify candidates with high yield strength or specific yield strength. These results are filtered with CALPHAD phase stability predictions to ensure sufficient BCC stability or metastability at high temperatures. Select compositions predicted to maintain high strength or specific strength and sufficient BCC stability are manufactured and mechanically tested to validate the tailored MPEA design process. Prepared by LLNL under Contract DE-AC52-07NA27344.
Proceedings Inclusion? Planned:
Keywords High-Entropy Alloys, Mechanical Properties, Modeling and Simulation


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