In situ heavy ion irradiation studies of nanopore shrinkage and enhanced radiation tolerance of nanoporous Au
- Texas A & M Univ., College Station, TX (United States). Dept. of Materials Science and Engineering
- Purdue Univ., West Lafayette, IN (United States). School of Materials
- Texas A & M Univ., College Station, TX (United States). Dept. of Mechanical Engineering
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States). MPA-CINT
- Purdue Univ., West Lafayette, IN (United States). School of Materials; Texas A & M Univ., College Station, TX (United States). Dept. of Electrical and Computer Engineering
- Purdue Univ., West Lafayette, IN (United States). School of Materials; Texas A & M Univ., College Station, TX (United States). Dept. of Mechanical Engineering
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. 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. Our study sheds light on the design of radiation-tolerant nanoporous metallic materials for advanced nuclear reactor applications.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC52-06NA25396; SC0016337
- OSTI ID:
- 1360711
- Report Number(s):
- LA-UR--16-29506
- Journal Information:
- Scientific Reports, Journal Name: Scientific Reports Vol. 7; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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