Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 21, Issue 20, Pages 3982-3989Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201101224
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Funding
- Air Force Office of Sponsored Research (AFOSR) YIP [FA9550-09-1-0084]
- NSF [ECCS-0702766]
- 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]
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Fracture of metals at the nanoscale and corresponding failure mechanisms have recently attracted considerable interest. However, quantitative in situ fracture experiments of nanoscale metals are rarely reported. Here it is shown that, under uni-axial tensile loading, single crystalline ultrathin gold nanowires may fracture in two modes, displaying distinctively different fracture morphologies and ductility. In situ high resolution transmission electron microscopy (HRTEM) studies suggest that the unexpected brittle-like fracture was closely related to the observed twin structures, which is very different from surface dislocation nucleation/propagation mediated mechanism in ductile fracture mode. Molecular dynamics (MD) simulations further reveal the processes of shear-induced twin formation and damage initiation at the twin structure/free surface interface, confirming the experimentally observed differences in fracture morphology and ductility. Finally, a fracture criterion based on competition between twin formation and surface dislocation nucleation/propagation as a function of misalignment angle is discussed.
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