Journal
SCIENTIFIC REPORTS
Volume 7, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep39484
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Funding
- NSF-DMR-Metallic Materials and Nanostructures Program [1643915]
- Petroleum Research Foundation [53741 - ND10]
- DoE-OBES [DE-SC0016337]
- US Office of Naval Research (ONR) [N00014-16-1-2778]
- DOE-Office of Nuclear Energy
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1643915] Funding Source: National Science Foundation
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High energy particle radiations induce severe microstructural damage in metallic materials. Nanoporous materials with a giant surface-to-volume ratio may alleviate radiation damage in irradiated metallic materials as free surface are defect sinks. Here we show, by using in situ Kr ion irradiation in a transmission electron microscope at room temperature, that nanoporous Au indeed has significantly improved radiation tolerance comparing with coarse-grained, fully dense Au. In situ studies show that nanopores can absorb and eliminate a large number of radiation-induced defect clusters. Meanwhile, nanopores shrink (self-heal) during radiation, and their shrinkage rate is pore size dependent. Furthermore, the in situ studies show dose-rate-dependent diffusivity of defect clusters. This study sheds light on the design of radiation-tolerant nanoporous metallic materials for advanced nuclear reactor applications.
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