Journal
NANO RESEARCH
Volume 4, Issue 12, Pages 1261-1267Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-011-0177-y
Keywords
Nanowires; in situ transmission electron microscope (TEM); mechanical characterization; dislocation nucleation; plasticity
Categories
Funding
- Air Force Office of Sponsored Research (AFOSR) [FA9550-09-1-0084]
- Welch Foundation [C-1716]
- National Science Foundation (NSF) [DMR-1128818]
- Center for Integrated Nanotechnologies, a U.S. Department of Energy, Office of Basic Energy Sciences user facility at Los Alamos National Laboratory [DE-AC52-06NA25396]
- Sandia National Laboratories [DE-AC04-94AL85000]
- U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1128818] Funding Source: National Science Foundation
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The plastic deformation and the ultrahigh strength of metals at the nanoscale have been predicted to be controlled by surface dislocation nucleation. In situ quantitative tensile tests on individual aOE (c) 111 > single crystalline ultrathin gold nanowires have been performed and significant load drops observed in stress-strain curves suggest the occurrence of such dislocation nucleation. High-resolution transmission electron microscopy (HRTEM) imaging and molecular dynamics simulations demonstrated that plastic deformation was indeed initiated and dominated by surface dislocation nucleation, mediating ultrahigh yield and fracture strength in sub-10-nm gold nanowires.
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