|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Computational Materials Engineering for Nuclear Reactor Applications
||One Dimensional Migration and Gas Bubble Superlattice Formation in UMo Metal Fuels--a Phase-field Model
||Shenyang Hu, Douglas E Burkes, Curt A Lavender, David J Senor, Zhijie Xu
|On-Site Speaker (Planned)
Since the solubility of fission gas atoms is extremely low in UMo fuels the gas atoms segregate and form gas bubbles. Nano-gas bubble superlattice is often observed in irradiated UMo nuclear fuels. However, its formation mechanism is not well understood. In this talk, we will present a phase-field model to investigate the mechanism of gas bubble superlattice formation. Physical processes: 1) the heterogeneous generation of gas atoms, vacancies and interstitials informed from atomistic simulations; 2) one dimensional migration of interstitials; 3) irradiation-induced dissolution of gas atoms; 4) elastic interaction; 5) heterogeneous nucleation of gas bubbles; and 6) fission rate are taken into account in the model. It is found that one dimensional migration of interstitials is the main mechanism for the formation of gas bubble superlattices, and fission rates, saturated gas concentration and elastic interaction all affect the morphology of gas bubble microstructures.
||Planned: A print-only volume