About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Accelerated Qualification of Nuclear Materials Integrating Experiments, Modeling, and Theories
|
Presentation Title |
E-15: Radiation Induced Segregation around Helium Bubbles in Reduced-Activation Ferritic/Martensitic (RAFM) Steels |
Author(s) |
Xingyu Liu, Jonathan D. Poplawsky, Matthew R. Chancey, Yongqiang Wang, Xing Wang |
On-Site Speaker (Planned) |
Xingyu Liu |
Abstract Scope |
Lower activation structural materials, such as RAFM steels, are necessary for the development of fusion reactors. Radiation induced segregation (RIS) around helium bubbles forms element-concentrated shells, which could reduce the vacancy flux towards bubbles, suppress the bubble growth, and improve the material swelling resistance. To investigate RIS near bubbles in RAFM steels, we irradiated F82H steel using 200 keV He ions to the fluence of 8×1015 cm-2 and 2.5 MeV Fe ions to 5.6×1016 cm-2 at 460°C. We measured RIS near bubbles and grain boundaries (GBs) using transmission electron microscopy and atom probe tomography. RIS was not observed at GBs, probably because Cr atoms diffused to Cr-rich precipitates formed along GB before irradiation. We discovered thin chromium-enriched shells surrounding all analyzed helium bubbles, suggesting a mechanism for bubble growth suppression. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Iron and Steel, Nuclear Materials |