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EEE1.08 - Stable Storage of Helium in Nanometer-Scale Interfacial Platelets 
Date/Time:
April 22, 2014   11:00am - 11:30am
 
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Helium (He) in structural metals precipitates into bubbles, causing severe damage. Using multiscale modeling, we find that at fcc-bcc interfaces, He is initially trapped in stable, sub-nanometer platelet-shaped clusters, not bubbles. This behavior occurs due to the spatial heterogeneity of the interface energy: He wets high energy, “heliophilic” regions while avoiding low energy, “heliophobic” ones. We confirmed this prediction with neutron reflectometry, which showed that interfacial He bubbles form only above a critical He concentration and provided evidence for the presence of stable He platelets below the critical He concentration. Our work paves the way for the design of composite structural materials with increased resistance to He-induced degradation by tailoring the types of interfaces they contain.This material is based upon work supported as part of the Center for Materials at Irradiation and Mechanical Extremes, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number 2008LANL1026.
 


 
 
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