|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Nanostructured Materials for Nuclear Applications
||Irradiation-induced Nanoprecipitation on Exhaustible Sinks
||Pascal Bellon, Robert S. Averback, Dallas R. Trinkle, Thomas Schuler
|On-Site Speaker (Planned)
One notable feature deriving from advanced nanoscale characterizations of irradiated materials is a rather ubiquitous presence of small chemical heterogeneities. Some of these heterogeneities are found in regions absent of dislocation loops or lines, and so they are not attributable simply to radiation-induced segregation on defect sinks. Irradiation-induced homogeneous precipitation is a possible mechanism, but linear stability analysis of diffusion models has shown that the conditions for this instability are quite restrictive. We propose here an alternative mechanism, whereby exhaustible (transient) sinks, such as small interstitial and vacancy clusters created in displacement cascades, promote the dynamical stabilization of solute clusters, even in undersaturated solid solutions. Using phase field modeling, we demonstrate that this mechanism is indeed very effective, even when the coupling between point defects and solute is not sufficient to trigger an instability by Frenkel pairs alone. The relevance to Ni-base and Fe-base alloys is discussed.
||Planned: A print-only volume