About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Meeting Materials Challenges for the Future of Fusion Energy
|
| Presentation Title |
F-9: Improved Damage Detection Around Grain Boundaries in Tungsten from Atomistic Calculations |
| Author(s) |
Younggak Shin, Keonwook Kang, Byeongchan Lee |
| On-Site Speaker (Planned) |
Byeongchan Lee |
| Abstract Scope |
With a shallow migration barrier, self-interstitial atoms generated by neutron irradiation quickly diffuse out of the damage cascade, leaving less mobile vacancies behind. An ideal single crystalline tungsten would self-heal to some extent as the Frenkel pairs will eventually recombine. It is therefore grain boundaries that truly triggers the irradiation damage beyond material’s self-healing limit.
Nevertheless, it is still unclear how materials degrade in the presence of grain boundaries, and one of the critical gaps is damage analysis techniques. For example, the Wigner-Seitz analysis, typically used to count the population of point defects, simply fails when defects are present in the initial state.
Here we present a volume-based analysis technique that correctly counts point defects in atomistic calculations, and we apply this method to study how grain boundaries interact with point defects. We also discuss a long-term projection on the microstructural evolution under irradiation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Characterization, |