Hi,

The CORE-CM seminar this week is

November 8:  Brian Wirth (Nuclear Engineering, University of Tennessee)
" Multiscale Investigation of Irradiation Effects in Structural Materials"

BPS 1400 at 12:00pm
Pizza and cookies available at 11:45am

Phil  Duxbury

Abstract
    Radiation damage, and its consequence to material properties, is a central issue in many advanced technologies, from nuclear fuel performance to lifetime extension in operating nuclear light water reactors to the development of high-energy accelerators for nuclear physics and advanced fission and fusion power plants. Irradiation effects are initiated by the violent displacement of atoms from their lattice sites due to the fission process or neutron scattering events, in addition to defect creation through very high levels of electronic energy deposition through the interaction of swift heavy ions. The impact of atomic displacements on materials degradation is ultimately determined by the diffusional transport and fate of the point defects and their clusters, along with the re-distribution of solutes and impurities. This presentation will first introduce the inherently multiscale nature of irradiation effects in materials and then describe a multiscale research paradigm based on close integration of materials modeling and advanced experimental characterization required to better understand irradiation effects. Select results will be presented from a hierarchical modeling approach that is closely compared with experimental measurements, which highlight recent improvements in understanding materials degradation in nuclear environments. In particular, results will presented that provide the evolution of irradiation-induced defect clusters and dislocation loops observed in thin-film, ion irradiated molybdenum.