About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Kinetics and Mechanisms Under External Forcing-Driven Conditions
|
| Presentation Title |
Elucidating the three-dimensional radiation-induced segregation morphology at grain boundaries in proton-irradiated 316L stainless steel |
| Author(s) |
Sara Wonner, Semanti Mukhopadhyay, Jack R Grimm, Venkata Bhuvaneswari Vukkum, Arun Devaraj, Pascal Bellon |
| On-Site Speaker (Planned) |
Sara Wonner |
| Abstract Scope |
Radiation-induced segregation (RIS) is a non-equilibrium kinetic phenomenon that occurs at point defect sinks in irradiated metallic alloys. In this study, we utilize atom probe tomography to characterize RIS at distinct grain boundaries (GBs) after 2 MeV proton irradiated 316L steel. We demonstrate that, contrary to common belief, segregation takes place at coherent twin boundaries but results in a heterogeneous, three-dimensional morphology that is fundamentally different from the homogeneous segregation observed at high-angle grain boundaries. Specifically, Ni and Si co-segregate to form linear and loop-like features, both in the GB plane and at an angle with it. These observations rationalize our recent STEM-EDS results and establish that RIS at coherent twin boundaries takes place on dislocation loops and other defect clusters pinned or absorbed by the GB. This novel coupling of structural defects and chemical evolutions in irradiated alloys is directly relevant to the GB engineering of radiation-resistant alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Characterization, Iron and Steel |