We investigate the radiation response of nanotwinned Cu by using in situ Kr ion irradiation technique inside a transmission electron microscope. In comparison with coarse grained Cu, nanotwinned Cu exhibits smaller defect size and lower defect density. In situ studies also show that twin boundaries effectively remove a large number of defect clusters. The life time of defect clusters in nanotwinned Cu is very different from that in its coarse grained counterpart. This study provides further evidence on twin-boundary enabled radiation tolerance in nanotwinned metals.
Bibliographical noteFunding Information:
We acknowledge financial support by NSF-DMR-Metallic Materials and Nanostructures Program under grant no. 1304101 . Y Chen is supported financially by NSF-CMMI 1161978 . KY Yu and the work on fabrication of nanotwinned metal were supported by DOE-OBES under grant no. DE-SC0010482 . KY Yu also acknowledges financial support from China University of Petroleum-Beijing under grant no. 2462015YQ0602 . XZ and HW also acknowledge the seed grants from Texas A&M University on studying of materials in extreme environments via in situ techniques. We also thank Peter M. Baldo and Edward A. Ryan at Argonne National Laboratory for their help during in situ irradiation experiments. The electron microscopy coupled with in situ ion irradiation was accomplished at Argonne National Laboratory at the IVEM-Tandem Facility, a U.S. Department of Energy Facility funded by the DOE Office of Nuclear Energy , operated under Contract No. DE-AC02-06CH11357 by U Chicago, Argonne, LLC . Accesses to the DOE - Center for Integrated Nanotechnologies (CINT) at Los Alamos and Sandia National Laboratories and Microscopy and Imaging Center at Texas A&M University are also acknowledged.
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- Defect kinetics
- In situ
- Radiation damage