In situ study of defect migration kinetics in nanoporous Ag with enhanced radiation tolerance
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...
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| Format: | Online |
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Nature Publishing Group
2014
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| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3894537/ |
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pubmed-3894537 |
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pubmed-38945372014-01-17 In situ study of defect migration kinetics in nanoporous Ag with enhanced radiation tolerance Sun, C. Bufford, D. Chen, Y. Kirk, M. A. Wang, Y. Q. Li, M. Wang, H. Maloy, S. A. Zhang, X. Article 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. Nature Publishing Group 2014-01-17 /pmc/articles/PMC3894537/ /pubmed/24435181 http://dx.doi.org/10.1038/srep03737 Text en Copyright © 2014, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by/3.0/ This work is licensed under a Creative Commons Attribution 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/ |
| repository_type |
Open Access Journal |
| institution_category |
Foreign Institution |
| institution |
US National Center for Biotechnology Information |
| building |
NCBI PubMed |
| collection |
Online Access |
| language |
English |
| format |
Online |
| author |
Sun, C. Bufford, D. Chen, Y. Kirk, M. A. Wang, Y. Q. Li, M. Wang, H. Maloy, S. A. Zhang, X. |
| spellingShingle |
Sun, C. Bufford, D. Chen, Y. Kirk, M. A. Wang, Y. Q. Li, M. Wang, H. Maloy, S. A. Zhang, X. In situ study of defect migration kinetics in nanoporous Ag with enhanced radiation tolerance |
| author_facet |
Sun, C. Bufford, D. Chen, Y. Kirk, M. A. Wang, Y. Q. Li, M. Wang, H. Maloy, S. A. Zhang, X. |
| author_sort |
Sun, C. |
| title |
In situ study of defect migration kinetics in nanoporous Ag with enhanced radiation tolerance |
| title_short |
In situ study of defect migration kinetics in nanoporous Ag with enhanced radiation tolerance |
| title_full |
In situ study of defect migration kinetics in nanoporous Ag with enhanced radiation tolerance |
| title_fullStr |
In situ study of defect migration kinetics in nanoporous Ag with enhanced radiation tolerance |
| title_full_unstemmed |
In situ study of defect migration kinetics in nanoporous Ag with enhanced radiation tolerance |
| title_sort |
in situ study of defect migration kinetics in nanoporous ag with enhanced radiation tolerance |
| description |
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. |
| publisher |
Nature Publishing Group |
| publishDate |
2014 |
| url |
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3894537/ |
| _version_ |
1612048561888821248 |