|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Accident Tolerant Fuels for Light Water Reactor
||Steam Oxidation and Heavy Ion Irradiation Behaviors of Ti2AlC Ceramics
||Bai Cui, Fei Wang, Ziyad Smoqi, Qing Su, Michael Nastasi
|On-Site Speaker (Planned)
Ti2AlC is a promising material for accident-tolerant fuel cladding. The research in our team has evaluated its resistance in high-temperature steam and irradiation environments. The oxidation kinetics of Ti2AlC followed a parabolic rate law in 100% steam from 600 to 1000 ˚C. The oxide scale consisted of an outer TiO2 layer and an inner Al2O3 layer. Higher steam flow rate accelerated the oxidation kinetics, which was likely attributed to stress generation due to the phase transformation of TiO2. The evolution of irradiation defects under heavy-ion irradiation was characterized by in-situ transmission electron microscopy (TEM) experiments. At 25-800 °C, nanoscale dislocation loops form on the basal plane mostly with a Burgers vector of (0 0 0 1). Ti2AlC samples remain crystalline in structure without amorphization. However, localized disorder of atomic positions on basal planes was revealed. Ti2AlC is more irradiation resistant at 800 °C than 25 °C.
||Planned: Supplemental Proceedings volume