| About this Abstract |
| Meeting |
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Symposium
|
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Presentation Title |
Cavity Formation in Ion Irradiated Fe and Fe-Cr Ferritic Alloys |
| Author(s) |
Yan-Ru Lin, Arunodaya Bhattacharya, Jean Henry, Steven J. Zinkle |
| On-Site Speaker (Planned) |
Yan-Ru Lin |
| Abstract Scope |
To provide a better understanding of the formation of cavities in ferritic steels, we have performed multi-temperature (400-550°C) simultaneous dual-beam ex-situ and in-situ irradiations on a series of ultra-high purity Fe, Fe-Cr alloys (3-14 wt% Cr), and several advanced ferritic steels. Helium production rates of 0.1 and 10 appm He/dpa were selected to examine the helium synergistic effects. Transmission electron microscopy was used to characterize the microstructures in more than 50 different irradiated samples. Cavities were observed in all the irradiated samples between 400-550°C. This indicates that the narrow temperature range of observable cavities reported in prior ion irradiation studies is likely an artifact associated with the use of low ion energies. Cavity swelling as a function of the Cr content is non-monotonic and could be controlled by solute trapping of defects or formation of alpha-prime precipitates leading to increased recombination. Higher He/dpa content resulted in a higher peak swelling temperature. |
| Proceedings Inclusion? |
Undecided |