About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Local Chemical Ordering and Its Impact on Mechanical Behaviors, Radiation Damage, and Corrosion
|
| Presentation Title |
Fundamental Characteristics of Refractory Multiple-Principal Element Alloys Under Ion Irradiation |
| Author(s) |
Annie Barnett, Emily Hopkins Mang, Xinyao Wang, Wei-Ying Chen, Patrick Callahan, Keith Knipling, David Rowenhorst, Jaime Marian, Michael Falk, Mitra L. Taheri |
| On-Site Speaker (Planned) |
Annie Barnett |
| Abstract Scope |
Refractory multiple principal element alloys (MPEAs) possess the high temperature properties required for application in modern nuclear energy systems, however the lattice heterogeneities associated with local chemical fluctuations alter fundamental deformation routes. Here, we compare the irradiation response of dilute and chemically complex refractory alloys using in- and ex-situ 1 MeV Kr ion irradiation at 300 °C. The two alloy classes develop distinct defect morphologies that reflect their lattice characteristics. In dilute alloys, the relatively smooth energy landscape facilitates 1D interstitial diffusion, with defect evolution governed primarily by solute–vacancy binding. In contrast, the distorted lattice of MPEAs stabilizes low-energy interstitials, producing non-equilibrium chemical ordering and reduced interstitial–vacancy recombination. These findings indicate that short-range order in single-phase MPEAs can be tuned through the energetics of self-interstitial atoms, providing a future pathway for alloy design given desired order environments. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Nuclear Materials, Characterization |
