Reversible cyclic deformation mechanism of gold nanowires by twinning–detwinning transition evidenced from in situ TEM

Subin Lee, Jiseong Im, Youngdong Yoo, Erik Bitzek, Daniel Kiener, Gunther Richter, Bongsoo Kim () and Sang Ho Oh ()
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Subin Lee: Pohang University of Science and Technology (POSTECH)
Jiseong Im: Pohang University of Science and Technology (POSTECH)
Youngdong Yoo: KAIST
Erik Bitzek: Institute I: General Materials Properties, Friedrich-Alexander Universität Erlangen-Nürnberg
Daniel Kiener: Montanuniversität Leoben
Gunther Richter: Max Planck Institute for Intelligent Systems, Heisenberg street
Bongsoo Kim: KAIST
Sang Ho Oh: Pohang University of Science and Technology (POSTECH)

Nature Communications, 2014, vol. 5, issue 1, 1-10

Abstract: Abstract Mechanical response of metal nanowires has recently attracted a lot of interest due to their ultra-high strengths and unique deformation behaviours. Atomistic simulations have predicted that face-centered cubic metal nanowires deform in different modes depending on the orientation between wire axis and loading direction. Here we report, by combination of in situ transmission electron microscopy and molecular dynamic simulation, the conditions under which particular deformation mechanisms take place during the uniaxial loading of [110]-oriented Au nanowires. Furthermore, by performing cyclic uniaxial loading, we show reversible plastic deformation by twinning and consecutive detwinning in tension and compression, respectively. Molecular dynamics simulations rationalize the observed behaviours in terms of the orientation-dependent resolved shear stress on the leading and trailing partial dislocations, their potential nucleation sites and energy barriers. This reversible twinning–detwinning process accommodates large strains that can be beneficially utilized in applications requiring high ductility in addition to ultra-high strength.

Date: 2014
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DOI: 10.1038/ncomms4033

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