|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Application Utilizing Test Reactors, Ion Beam Facilities and Integrated Modeling
||The Influence of Bimodal Cavity Distributions on Swelling Evolution in Helium Pre-implanted T91
||Anthony Monterrosa, Gerrit VanCoevering, Zhijie Jiao, Gary Was
|On-Site Speaker (Planned)
Helium is pre-implanted in ion-irradiated samples to compensate for the lack of transmutation reactions in accelerator-based radiation damage experiments. The purpose of this study is to determine the effect of helium pre-implanted over four orders of magnitude (0, 1, 10, 100, and 1000 appm) on the swelling evolution in ferritic-martensitic alloy T91. Irradiations with 5 MeV Fe<SUP>2+</SUP> ions up to damage levels of 300 dpa at 460°C were performed at the Michigan Ion Beam Laboratory. Bimodal cavity distributions were formed at helium levels of 100 appm and above and resulted in suppression of swelling. The smaller mode of the bimodal remained relatively insensitive to damage over the range of 300 dpa and served as a strong sink for point defects. The experiments were performed in conjunction with a cluster dynamics model to explore the influence of bubble formation and size distribution on the evolution of swelling.
||Planned: Supplemental Proceedings volume