|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Thermal and Mechanical Stability of Nanocrystalline Materials
||Probing the Interfacial-driven Radiation Tolerance of Nanocrystalline Metals
||Jacob Gruber, Greg Vetterick, Pranav K Suri, Mitra L Taheri, Garritt J Tucker
|On-Site Speaker (Planned)
Nanocrystalline materials show tremendous promise for applications in extreme environments, where radiation tolerance, and potentially other properties, can be enhanced by the increased density of interfaces. The role of interfaces remains unclear; the behavior of individual equilibrium grain boundaries has been studied extensively, non-equilibrium grain boundaries, which comprise the majority of interfaces in real conditions, remain relatively unexplored. Using molecular dynamics, we determine that the non-equilibrium character of an interface plays a significant role in its radiation response: non-equilibrium configurations frequently decrease in energy while absorbing defects, impossible in perfect boundaries. Furthermore, non-equilibrium boundaries also can provide point defects with high mobility paths not present in prefect grain boundaries. Combined, these results show that significantly higher defect sink mobility can be achieved in non-equilibrium boundaries, in line with experimental results. The fine control of interface character therefore provides routes towards the optimization of bulk radiation response.
||Planned: Supplemental Proceedings volume