About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Accelerated Discovery and Qualification of Nuclear Materials for Energy Applications
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Presentation Title |
Helium Effect on Cavity Swelling in Dual-ion Irradiated Fe and Fe-Cr Alloys |
Author(s) |
Yan-Ru Lin, Arunodaya Bhattacharya, Da Chen, Ji-Jung Kai, Jean Henry, Steven Zinkle |
On-Site Speaker (Planned) |
Yan-Ru Lin |
Abstract Scope |
Fe-Cr ferritic-martensitic steels are promising structural materials for nuclear applications, in part due to cavity swelling resistance. However, transmutant helium enhances cavity nucleation and may cause unacceptable swelling for DT fusion reactors. We have performed multi-temperature (400 to 550°C) simultaneous dual-ion irradiations on ultra-high purity bcc Fe and Fe-Cr alloys (3 to 14 wt.% Cr). 8 MeV Ni3+ ions were selected to provide a relatively wide mid-range region with a dose ~30dpa. Energy-degraded 3.5MeV He2+ ions were simultaneously implanted at rates of 0.1appm/dpa and 10appm/dpa that are relevant to the irradiation conditions of fission and fusion reactors, respectively. Void swelling occurred at all temperatures in all alloys at both He implant conditions. Transmission electron microscopy (TEM) characterization found that the cavity swelling of 10appmHe/dpa irradiated samples was larger than the 0.1appmHe/dpa irradiated samples. In addition, the bimodal distribution of cavities was only observed in the materials irradiated with 10appm He/dpa. |
Proceedings Inclusion? |
Planned: |