| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Testing Compositionally Complex Alloys for Phase Stability in High Radiation Environments |
| Author(s) |
Sydney E. Copp, Siwei Chen, Yajie Zhao, Sicilia Christadore, Steven Zinkle |
| On-Site Speaker (Planned) |
Sydney E. Copp |
| Abstract Scope |
Compositionally complex alloys (CCAs) are promising high performance structural material options for future nuclear reactors. Their complex atomistic makeup is hypothesized to improve the phase stability, thereby improving the radiation resistance and minimizing mechanical property changes when exposed to environmental extremes. In this study, two materials (HfTiZrTa0.5 and MoNbTi, each with two different heat treatments to simultaneously produce high strength and ductility) were irradiated using 9 MeV copper irons at room temperature, 400 oC, or 800 oC to a midrange dose of either 1 or 10 dpa. Post-irradiation characterization using TEM, glancing incidence x-ray diffraction, and nanoindentation revealed transformation-induced plasticity (TRIP) behavior associated with a BCC to HCP structure transition in the CCAs irradiated at elevated temperatures, as well as a transition to an amorphous phase in the room temperature irradiations. Understanding the behavior of these materials under environmental extremes provides insight to their viability as nuclear structural materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Nuclear Materials, Characterization |