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.
