About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Advances in Refractory High Entropy Alloys and Ceramics
|
| Presentation Title |
Design and Validation of Tungsten-Based High Entropy Alloys |
| Author(s) |
Dan J. Thoma, Caleb Hatler, Matthew Vigil, Bochuan Sun, Enrique Martinez, Nathan Curtiss, Adrien Couet, Saryu Fensin, Skye Supakul, Ishtiaque Robin, Osman El Atwani |
| On-Site Speaker (Planned) |
Dan J. Thoma |
| Abstract Scope |
Development of refractory tungsten alloys for nuclear applications pose challenges to computationally design, experimentally test, and scale-up components for multi-objective performance objectives. This study investigates thermodynamic computational assessments in the absence of fully developed CALPHAD databases to computationally design and experimentally process, characterize and test alloys using high-throughput techniques. Compositions in the WTaVCrHf quinary system were calculated to promote BCC phase stability using both cluster expansion and CALPHAD methods. Over 75 alloy compositions were down selected and processed into 1 cm^3 samples via additive manufacturing. Automated indentation, X-ray diffraction, and irradiation were performed to select the best combination of properties. A final alloy was translated to laser powder bed fusion for testing and scale-up. Ambient temperature yield strengths of ~1.8 GPa were produced in an alloy that also had higher thermal conductivity than pure tungsten at 1273 K. This design and validation process has been extended to other refractory HEAs. |