|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials and Fuels for the Current and Advanced Nuclear Reactors VII
||Kinetic Evolution of Transmutation Helium Accumulation at Y-Ti-O Oxides in Nanostructured Ferritic Alloys under Irradiation
||Chris Nellis, Celine Hin
|On-Site Speaker (Planned)
Concerns about the creation and growth of bubbles composed of transmutation helium in nuclear materials prompted the material design of oxide precipitates in nanostructured ferritic alloys. These oxides act as nucleation sites for transmutation helium bubbles, protecting the materials from embrittlement. A kinetic Monte Carlo (KMC) model was created to simulate the formation of these oxides under heat treatment. The neutron irradiation damage and the production of transmutation helium have also been implemented in the KMC code to reproduce real radiation damage conditions in nuclear reactors. The radiation induced segregation at grain boundaries, and precipitation will be presented. Important observations including the nucleation of helium bubbles at the surface of the oxides and the bubble size distribution throughout the matrix will be discussed. The KMC code has been used to study the microstructure evolution for numerous temperatures and dose rate conditions. The results will be compared to TEM observations.
||Planned: Supplemental Proceedings volume