Research Article

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2011, 4(12): 1261–1267

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https://doi.org/10.1007/s12274-011-0177-y

Surface Dislocation Nucleation Mediated Deformation and Ultrahigh Strength in Sub-10-nm Gold Nanowires

Yang Lu1,, Jun Song2, Jian Yu Huang3, and Jun Lou1()

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1Department of Mechanical Engineering & Materials Science, Rice University, Houston, TX 77005, USA2Department of Mining & Materials Engineering, McGill University, Montreal, QC H3A 2B2, Canada3Center for Integrated Nanotechnologies (CINT), Sandia National Laboratories, Albuquerque, NM 87185, USAPresent address: Department of Materials Science and Engineering, MIT, Cambridge, MA 02139, USA

Keywords: KEYWORDS Nanowires, in situ transmission electron microscope (TEM), mechanical characterization, dislocation nucleation, plasticity
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ABSTRACT 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 <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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Surface Dislocation Nucleation Mediated Deformation and Ultrahigh Strength in Sub-10-nm Gold Nanowires. Nano Res. 2011, 4(12): 1261–1267 https://doi.org/10.1007/s12274-011-0177-y

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