|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Materials Science and Engineering for Nuclear Energy
||Evolution of Grain Boundary Structure and Composition in Irradiated SiC
||Izabela Szlufarska, Xing Wang, Hao Jiang, Tomonori Baba
|On-Site Speaker (Planned)
Irradiation-induced evolution of structure and chemistry of grain boundaries has important implications for such properties as mechanical strength, corrosion resistance, as well and structural stabilities of materials subjected to irradiation. Using a combination of multi-scale modeling and transmission electron microscopy experiments performed on bicrystal samples, we have investigated such changes taking place in ion-irradiated silicon carbide. We found that irradiation can either enrich or deplete carbon from grain boundaries, depending on irradiation temperature. We have also discovered how tilt and twist grain boundaries accommodate defects in this material and we have developed models to predict structural evolution of these grain boundaries under irradiation. Our model predicts a transition in mechanisms of defect accommodation as a function of temperature, radiation flux, and grain size.
||Planned: Supplemental Proceedings volume