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.