Journal
SCIENTIFIC REPORTS
Volume 4, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep04397
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Funding
- US Department of Energy, Office of Science, Office of Basic Energy Sciences
- Los Alamos National Laboratory Directed Research and Development [LDRD-ER20140450]
- NSF through University of Pittsburgh [CMMI 0928517]
- Innovation Foundation of BUAA
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0928517] Funding Source: National Science Foundation
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Coherent twin boundaries (CTBs) in nano-twinned materials could improve crack resistance. However, the role of the CTBs during crack penetration has never been explored at atomic scale. Our in situ observation on nano-twinned Ag under a high resolution transmission electron microscope (HRTEM) reveals the dynamic processes of a crack penetration across the CTBs, which involve alternated crack tip blunting, crack deflection, twinning/detwinning and slip transmission across the CTBs. The alternated blunting processes are related to the emission of different types of dislocations at the crack tip and vary with the distance of the crack tip from the CTBs.
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