| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments II
|
| Presentation Title |
Bias and Void Swelling in Irradiated α-iron Using Mesoscale and Atomistic Simulations |
| Author(s) |
Haixuan Xu, Ziang Yu |
| On-Site Speaker (Planned) |
Haixuan Xu |
| Abstract Scope |
Void swelling is a critical phenomenon in irradiated structural materials, which leads to dimensional changes of materials and severely impacts the lifetime of components in nuclear reactors. This phenomenon is attributed to the preferential absorption of irradiation-generated interstitials over vacancies by sinks, which is defined as bias factor. However, it has been challenging to accurately calculate the bias factors of straight dislocations and dislocation loops using conventional approaches. Here, we employ mesoscale and atomistic simulations based on a recent-developed approach using point defect migration lifetimes. We calculate the capture efficiencies and bias factors of the major biased sinks in α-iron, including straight dislocations (both edge and screw types) and dislocation loops. The predicted swelling rates based on the obtained bias factors reach an unprecedented temperature-dependent and value agreement with experimental observations. Additionally, this approach is capable of investigating a variety of situations, e.g. interfaces under irradiation environments. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Modeling and Simulation, Nuclear Materials |