About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Materials Systems for the Future of Fusion Energy
|
Presentation Title |
Effect of Cr and He on Cavity Swelling in Dual-Ion Irradiated High Purity Fe-Cr Alloys |
Author(s) |
Yan-Ru Lin, Arunodaya Bhattacharya, Jean Henry, Steven J. Zinkle |
On-Site Speaker (Planned) |
Steven J. Zinkle |
Abstract Scope |
Simultaneous dual-beam irradiations on ultra-high purity Fe and Fe-Cr alloys (3-14 wt% Cr) at 400-550°C were performed to improve understanding of cavity formation in ferritic alloys. 8 MeV Ni ions (relatively wide safe analysis zone with a midrange dose ~30 dpa) and helium production rates of 0.1, 10, and 50 appm He/dpa were selected. Cavities were observed by TEM in all irradiated samples. A bimodal cavity size distribution was observed in the 10 and 50 He appm/dpa samples, but not for 0.1 He appm/dpa. The peak swelling temperature was noticeably higher for the Fe-Cr alloys compared to pure Fe. Higher He/dpa content resulted in a higher peak swelling temperature for pure Fe. Peak cavity swelling occurs at intermediate He/dpa (fusion relevant condition). Swelling as a function of the Cr content is non-monotonic and could be controlled by solute trapping of defects and α’ precipitates leading to increased recombination. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Iron and Steel, Characterization |