|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Application Utilizing Test Reactors, Ion Beam Facilities and Integrated Modeling
||A Heterogeneous Cavity Nucleation Model for Swelling in Simulated Ferritic Alloys
||Gerrit VanCoevering, Aaron Kohnert, Brian Wirth, Gary S Was
|On-Site Speaker (Planned)
Ion irradiation is frequently used to emulate radiation damage to structural materials during reactor operation using heightened dose rate which allows well-controlled experiments which rapidly reach high dose at the cost of slightly altering the underlying physics. A cluster dynamics model was developed and utilized to investigate the impact of dose rate on swelling phenomena in simulated ferritic alloys at high irradiation dose. Classical, homogeneous nucleation models are unable to reproduce key experimental observations. For example, temperature shift to account for dose rate change is over-predicted, the importance of transmuted/injected helium is under-predicted, and an incubation period is essentially absent. A heterogeneous nucleation model, in which helium preferentially accumulates on preexisting microstructural sites, has demonstrated a critical role in rectifying these discrepancies by weakening the temperature dependence of cavity density.
||Planned: Supplemental Proceedings volume