Near-ideal theoretical strength in gold nanowires containing angstrom scale twins

Jiangwei Wang, Frederic Sansoz (), Jianyu Huang, Yi Liu, Shouheng Sun, Ze Zhang and Scott X. Mao ()
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Jiangwei Wang: University of Pittsburgh, 3700 O’Hara Street
Frederic Sansoz: Mechanical Engineering and Materials Science Programs, School of Engineering, The University of Vermont
Jianyu Huang: Center for Integrated Nanotechnologies, Sandia National Laboratories
Yi Liu: Brown University
Shouheng Sun: Brown University
Ze Zhang: Zhejiang University
Scott X. Mao: University of Pittsburgh, 3700 O’Hara Street

Nature Communications, 2013, vol. 4, issue 1, 1-8

Abstract: Abstract Although nanoscale twinning is an effective means to enhance yield strength and tensile ductility in metals, nanotwinned metals generally fail well below their theoretical strength limit due to heterogeneous dislocation nucleation from boundaries or surface imperfections. Here we show that Au nanowires containing angstrom-scaled twins (0.7 nm in thickness) exhibit tensile strengths up to 3.12 GPa, near the ideal limit, with a remarkable ductile-to-brittle transition with decreasing twin size. This is opposite to the behaviour of metallic nanowires with lower-density twins reported thus far. Ultrahigh-density twins (twin thickness

Date: 2013
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DOI: 10.1038/ncomms2768

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