About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Transmutation Effects in Fusion Reactor Materials: Critical Challenges & Path Forward
|
| Presentation Title |
The Effect of Helium on Cavity Swelling in Dual-ion Irradiated Fe and Fe-10Cr Ferritic Alloys |
| Author(s) |
Yan-Ru Lin, Arunodaya Bhattacharya, Steven Zinkle |
| On-Site Speaker (Planned) |
Yan-Ru Lin |
| Abstract Scope |
To gain fundamental insights into the He effects on cavity swelling, high purity Fe and Fe-10 wt.% Cr ferritic model alloys were irradiated with 8 MeV Ni ions and co-implanted He ions at 500°C up to 30 dpa with He implantation rates of 0.1, 10 and 50 appm He/dpa. By transmission electron microscopy, a bimodal cavity size distribution was observed in the 10 and 50 appm He/dpa samples, but not for 0.1 appm He/dpa. Cavity swelling was maximized at intermediate He implantation rates of ~10 appm He/dpa for both Fe and Fe-10Cr alloys. The cavity swelling behavior as a function of He implantation rate appears to be controlled by the He/dpa-dependent variation of cavity sink strengths. Treating small bubbles as biased sinks for interstitial absorption can significantly increase the ratio of biased to unbiased sink strengths (Q) and results in maximized cavity swelling for a Q ratio close to one. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Characterization, Nuclear Materials |