About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Late News Poster Session
|
| Presentation Title |
K-12: Mobility of a⟨100⟩ Self-Interstitial Atom Dislocation Loops in BCC Fe |
| Author(s) |
Joshua Kempfert, Jonathan L Wormald, Ting Zhu |
| On-Site Speaker (Planned) |
Joshua Kempfert |
| Abstract Scope |
Substantial concentrations of self-interstitial atom (SIA) loops can develop in the microstructure of irradiated metals, obstructing dislocation motion and contributing to irradiation embrittlement. In body-centered cubic (BCC) Fe, a⟨100〉 SIA loops are observed at irradiation temperatures exceeding around 500 ℃ and have been observed to migrate and coalesce. The role of dislocation glide in these processes is uncertain, as most existing atomistic calculations suggest that they are essentially sessile. Thus, atomistic simulations using predictive machine-learned interatomic potentials are conducted to clarify the mechanisms of a⟨100〉 loop migration. Loop motion is found to occur mainly through kink nucleation and propagation, and thermal activation of these processes is kinetically feasible at temperatures where a⟨100〉 SIA loops are commonly observed (~500 ℃). This work demonstrates that dislocation glide is a competitive mechanism for the migration of a⟨100〉 SIA loops during microstructure evolution under irradiation. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Computational Materials Science & Engineering, Nuclear Materials, Iron and Steel |