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In situ study of defect migration kinetics in nanoporous Ag with enhanced radiation tolerance

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep03737· OSTI ID:1624684
 [1];  [2];  [2];  [3];  [4];  [5];  [6];  [4];  [7]
  1. 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
  2. Texas A & M Univ., College Station, TX (United States). Dept. of Materials Science and Engineering
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Science and Technology Division
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Nuclear Engineering Division
  6. 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
  7. 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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Cited By (10)

Mobility and coalescence of stacking fault tetrahedra in Cu journal March 2015
IM3D: A parallel Monte Carlo code for efficient simulations of primary radiation displacements and damage in 3D geometry journal December 2015
The Role of Computer Simulation in Nanoporous Metals—A Review journal August 2015
Irradiation Enhances Strength and Deformability of Nano-Architected Metallic Glass journal February 2018
In situ TEM investigation of self-ion irradiation of nanoporous gold journal January 2019
A Review on the Radiation Response of Nanoporous Metallic Materials journal August 2018
Recent Studies on the Microstructural Response of Nanotwinned Metals to In Situ Heavy Ion Irradiation journal November 2019
Damage-tolerant nanotwinned metals with nanovoids under radiation environments journal April 2015
Influences of Au ion radiation on microstructure and surface-enhanced Raman scattering of nanoporous copper journal March 2018
In situ study on surface roughening in radiation-resistant Ag nanowires journal March 2018

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