| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior and Degradation of Advanced Nuclear Fuel and Structural Materials
|
| Presentation Title |
Effective Bias of Cavities in BCC Fe: As Revealed by Atomistic Calculations |
| Author(s) |
Yuhao Wang, Fei Gao, Brian Wirth |
| On-Site Speaker (Planned) |
Yuhao Wang |
| Abstract Scope |
A new bias-driven criterion for the critical size of cavity nucleation was recently reported by introducing the cavity bias for interstitials over vacancies. This criterion provides a more universal explanation on cavity behaviors such as incubation period, helium requirement and bimodal size distribution over a much wider temperature range comparing to the classic thermal criterion. The previous study has determined the effective bias for different types of interstitial defects over vacancy defects to voids in BCC Fe and a specific homogenization method was established for larger interstitial clusters due to their one-dimensional diffusion behavior. Considering helium generated from the (n, α) reaction plays an important role in cavity swelling, atomistic calculations were performed to investigate the interaction distance as well as the effective bias for single interstitial, single vacancy and corresponding larger clusters to He bubbles with different sizes and bubble pressure conditions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Other, Other |