About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Materials Science and Engineering of Materials in Nuclear Reactors
|
Presentation Title |
Exploration of Fundamental Radiation Effects Phenomena in Materials |
Author(s) |
Steven J. Zinkle, Ling Wang, Yan-Ru Lin, Yajie Zhao, Arunodaya Bhattacharya |
On-Site Speaker (Planned) |
Steven J. Zinkle |
Abstract Scope |
Three examples of recent fundamental experimental radiation effects studies that help validate and inform computational modeling predictions will be presented. 1) Molecular dynamics simulations predict that small interstitial clusters in FCC and BCC metals will exhibit rapid 1-dimensional (1D) glide, as opposed to random-walk 3D diffusion historically assumed. By monitoring depth-dependent loss of precipitate coherency in ion irradiated metals and the extent of peak void swelling zones next to grain boundary denuded zones, we have verified the occurrence of 1D glide but this effect disappears for sink strengths above ~1014/m2. 2) Cr-rich alpha prime precipitation in high-purity Fe-Cr alloys is observed to occur over a wide range of irradiation temperatures (300-450C) and dose rates (up to 0.001 dpa/s), in contrast to early ion irradiation reports of no precipitation. 3) The effects of He on cavity swelling in ion-irradiated Fe-Cr alloys up to ~10 appm He/dpa at 400-550C will be summarized. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |