In situ study of defect migration kinetics in nanoporous Ag with enhanced radiation tolerance
- Texas A & M Univ., College Station, TX (United States). Dept. of Materials Science and Engineering; Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Science and Technology Division; DOE/OSTI
- Texas A & M Univ., College Station, TX (United States). Dept. of Materials Science and Engineering
- Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Science and Technology Division
- Argonne National Lab. (ANL), Argonne, IL (United States). Nuclear Engineering Division
- Texas A & M Univ., College Station, TX (United States). Dept. of Materials Science and Engineering; Texas A & M Univ., College Station, TX (United States). Dept. of Electrical and Computer Engineering
- Texas A & M Univ., College Station, TX (United States). Dept. of Materials Science and Engineering; Texas A & M Univ., College Station, TX (United States). Dept. of Mechanical Engineering
Defect sinks, such as grain boundaries and phase boundaries, have been widely accepted to improve the irradiation resistance of metallic materials. However, free surface, an ideal defect sink, has received little attention in bulk materials as surface-to-volume ratio is typically low. Here by using in situ Kr ion irradiation technique in a transmission electron microscope, we show that nanoporous (NP) Ag has enhanced radiation tolerance. Besides direct evidence of free surface induced frequent removal of various types of defect clusters, we determined, for the first time, the global and instantaneous diffusivity of defect clusters in both coarse-grained (CG) and NP Ag. Opposite to conventional wisdom, both types of diffusivities are lower in NP Ag. Such a surprise is largely related to the reduced interaction energy between isolated defect clusters in NP Ag. Determination of kinetics of defect clusters is essential to understand and model their migration and clustering in irradiated materials.
- Research Organization:
- UT-Battelle LLC/ORNL, Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- Grant/Contract Number:
- AC07-05ID14517
- OSTI ID:
- 1624684
- Journal Information:
- Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 4; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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