|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials and Fuels for the Current and Advanced Nuclear Reactors VII
||Effect of C and Si Impurities in U10Mo Alloy: Discovery of New Quaternary Si-rich Phase and its Influence on Transformation Kinetics
||Arun Devaraj, Libor Kovarik, Saumyadeep Jana, Curt Lavender, Vineet Joshi
|On-Site Speaker (Planned)
Si and C are two major impurity elements that can be introduced to U10Mo alloy during melting and casting of U10Mo alloy fuels. Carbon was observed to form UC and increased Carbon concentration near grain boundaries in U10Mo alloy was observed by Atom probe tomography (APT). Additionally a new quaternary U2Si2MoC phase precipitate was discovered using detailed transmission electron microscopy diffraction and aberration corrected STEM imaging combined with APT. The stability of this new phase and atom positions were refined using first principle VASP density functional theory calculations. This new phase was found to precipitate as either blocky precipitates or as a grain boundary wetting phase depending up on the homogenization temperature, directly influencing the extent of cellular transformation during sub-eutectoid annealing. A comprehensive analysis of the effect of Carbon and Silicon impurities in microstructure evolution of U10Mo alloys during the various steps of fuel processing will be presented.
||Planned: Supplemental Proceedings volume