|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Nanostructured Materials for Nuclear Applications
||Mechanisms of Defect Interactions on Grain Boundaries of Pure Fe
||Lin Shao, Di Chen, Tianyi Chen, Jonathan Gigax
|On-Site Speaker (Planned)
It has been well known that grain boundaries in metals can act as defect sinks. However, little is known about how these boundary-trapped defects interact and recombine. Through an integrated experimental and modeling study, we have shed light onto fundamentals of defect-boundary interactions under different boundary configurations in pure Fe. Widths of defect deletion zones away from a grain boundary were characterized in ion-irradiated Fe, as a function of boundary misalignment angles. The higher the grain boundary angles, the wider the depletion zones. Mechanisms of this defect sink strength dependence on boundary angles are revealed by molecular dynamics simulations which show that grain boundary defect recombination is realized through one dimensional chain-like (or crowdion-like) defects, which contains alternately positioned interstitials and vacancies. For large angle grain boundaries, not only mobility of chain-like defects is increased, their allowed moving directions are also increased, leading to higher defect recombination efficiency.
||Planned: A print-only volume