| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Elucidating Microstructural Evolution Under Extreme Environments
|
| Presentation Title |
Investigating Radiation Induced Segregation Near Nanosized Cavities by Combining Rate Theory Calculation and Atom Probe Tomography |
| Author(s) |
Xing Wang, Xingyu Liu, Xinyuan Xu |
| On-Site Speaker (Planned) |
Xing Wang |
| Abstract Scope |
Radiation-induced segregation (RIS) is a common phenomenon that could significantly modify the microstructure and properties of materials under irradiation. While RIS near grain boundaries has been intensively studied, only a few works have focused on RIS near cavities, including voids and bubbles, which are the dominant reasons for swelling. Unlike grain boundaries, cavities exhibit unique characteristics as defect sinks, such as smaller volume, lower sink strength, potentially stronger bias for pressurized bubbles, and shorter inter-sink distances in high-density cavities. By combining 2D rate-theory modeling with atom probe characterization, we revealed the impact of these features on RIS near nanosized cavities in both Ni-based fcc alloys and Fe-based bcc alloys. Specifically, RIS near cavities would saturate at a much smaller dose than grain boundaries. In addition, the chemical segregation fields near multiple cavities can interact with each other, resulting in different composition profiles depending on the specific defect diffusivities. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Characterization, Modeling and Simulation |