Journal
SMALL
Volume 8, Issue 19, Pages 2986-2993Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201200522
Keywords
metallic nanowires; mechanical properties; plasticity; twin-boundaries; in-situ TEM testing
Categories
Funding
- NSF [DMR-0907196, CMS-0547681]
- Army High Performance Computing Research Center at Stanford University
- Northwestern University Materials Research Science & Engineering Center (NU-MRSEC) [NSF DMR-0520513]
- Leading Foreign Research Institute Recruitment Program through the National Research Foundation of Korea
- Ministry of Education, Science and Technology [2011-0030065]
- National Research Foundation of Korea [2011-0030065] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0907196] Funding Source: National Science Foundation
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A unique size-dependent strain hardening mechanism, that achieves both high strength and ductility, is demonstrated for penta-twinned Ag nanowires (NWs) through a combined experimental-computational approach. Thin Ag NWs are found to deform via the surface nucleation of stacking fault decahedrons (SFDs) in multiple plastic zones distributed along the NW. Twin boundaries lead to the formation of SFD chains that locally harden the NW and promote subsequent nucleation of SFDs at other locations. Due to surface undulations, chain reactions of SFD arrays are activated at stress concentrations and terminated as local stress decreases, revealing insensitivity to defects imparted by the twin structures. Thick NWs exhibit lower flow stress and number of distributed plastic zones due to the onset of necking accompanied by more complex dislocation structures.
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