| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Role of Phosphorus in Irradiated Microstructure Evolution of a Binary Fe-P Model Alloy by TEM In Situ Irradiation |
| Author(s) |
Patrick Henry Warren, Wei-Ying Chen, Ling Wang, Janelle Wharry |
| On-Site Speaker (Planned) |
Patrick Henry Warren |
| Abstract Scope |
The objective of this study is to understand the role of phosphorus (P) in irradiation-induced defect clustering and loop nucleation. High-strength steels rely on solid solution strengthening from P additions. But ab initio studies have predicted strong self-interstitial atom trapping by P in Fe, potentially leading to enhanced defect formation under irradiation in Fe-P alloys. This study utilized transmission electron microscopy (TEM) in situ irradiation with 1 MeV Kr2+ ions at 370°C of an Fe-4at%P alloy. The alloy contains a multiphase microstructure of bcc-Fe matrix with dilute P, and bct Fe3P intermetallic phases. The threshold nucleation dose for dislocation loops, radiation-assisted precipitation and coarsening increases with distance from pre-existing interphase boundaries. The greater susceptibility to irradiation damage near the Fe3P phases is attributed to higher local P concentration due to ballistic dissolution of the P-rich Fe3P phase. This study provides evidence that cluster evolution is dependent on local P concentration. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Phase Transformations, Iron and Steel |