In Situ Studies on Twin-Thickness-Dependent Distribution of Defect Clusters in Heavy Ion-Irradiated Nanotwinned Ag
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Recent studies have shown that twin boundaries are effective defect sinks in heavy ion irradiated nanotwinned (nt) metals. Prior in situ radiation studies on nt Ag at room temperature indicate that the accumulative defect concentration is higher in center areas in the 60-nm-thick twins, and twin boundaries are distorted and self-heal during the absorption of different types of defect clusters. In this follow-up study, we show that the spatial distribution of accumulative defect concentrations in nt metals has a clear dependence on twin thickness, and in certain cases, the trend of spatial distribution is reversed. Potential mechanisms for the counterintuitive findings are discussed.
KeywordsTwin Boundary Dislocation Loop Defect Cluster Twin Thickness Thin Twin
We acknowledge the financial support provided by NSF-DMR-Metallic Materials and Nanostructures Program under Grant No. 1643915. HW acknowledges the support from the U.S. Office of Naval Research (N00014-16-1-2778). We also acknowledge the access of microscopes at the Microscopy and Imaging Center at Texas A&M University and the DoE Center for Integrated Nanotechnologies managed by Los Alamos National Laboratory. The IVEM facility at Argonne National Laboratory is supported by DOE-Office of Nuclear Energy.
- 11.C. Sun, D. Bufford, Y. Chen, M. A. Kirk, Y. Q. Wang, M. Li, H. Wang, S. A. Maloy, X. Zhang: Sci. Rep., 2014, vol. 4, pp. 3737.Google Scholar
- 30.E. G. Fu, M. Caro, L. A. Zepeda-Ruiz, Y. Q. Wang, K. Baldwin, E. Bringa, M. Nastasi, A. Caro: Appl. Phys. Lett., 2012, vol. 101, pp. 191–607.Google Scholar