|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Nanostructured Materials for Nuclear Applications
||Evolution of Helium Bubbles in Nano-engineered SiC under Irradiation
||Chien-Hung Chen, Yongqiang Wang, Miguel Luis Crespillo, Cristiano Gino Fontana, Joseph Turner Graham, Steven Christopher Shannon, Yanwen Zhang, William John Weber
|On-Site Speaker (Planned)
Nano-engineered SiC (NE-SiC), with enhanced defect migration and annihilation, was previously reported to have increased radiation-resistance. In this study, the effects of thermal annealing and heavy ion irradiation on damage evolution in NE-SiC samples, pre-implanted with helium, are studied using complimentary techniques of post-irradiation transmission electron microscopy (TEM), in-situ TEM under irradiation and time-of-flight elastic recoil detection analysis (ToF-ERDA). Irradiation with 9 MeV Au3+ at 700 °C to 30 dpa resulted in preferential formation of bubbles at grain boundaries. Due to the stable self-layered interfacial structure of NE-SiC, defect and helium migration under irradiation at high-temperatures occurs 2-dimensionally by interlayer diffusion. This leads to enhanced helium bubble aggregation at grain boundaries. No significant change in the helium depth distribution is observed from ToF-ERDA measurement. On-the-other-hand, helium release is observed by in-situ TEM under Kr2+ irradiation at 800 °C.
||Planned: A print-only volume