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Title: In situ heavy ion irradiation studies of nanopore shrinkage and enhanced radiation tolerance of nanoporous Au

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.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [2] ;  [5] ;  [6]
  1. Texas A & M Univ., College Station, TX (United States). Dept. of Materials Science and Engineering
  2. Purdue Univ., West Lafayette, IN (United States). School of Materials
  3. Texas A & M Univ., College Station, TX (United States). Dept. of Mechanical Engineering
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). MPA-CINT
  5. 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
  6. Purdue Univ., West Lafayette, IN (United States). School of Materials; Texas A & M Univ., College Station, TX (United States). Dept. of Mechanical Engineering
Publication Date:
Report Number(s):
LA-UR-16-29506
Journal ID: ISSN 2045-2322
Grant/Contract Number:
AC52-06NA25396; SC0016337
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; nanoscale materials
OSTI Identifier:
1360711