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

Wang, Jiangwei; Sansoz, Frederic; Huang, Jianyu; Liu, Yi; Sun, Shouheng; Zhang, Ze; Mao, Scott X.

doi:10.1038/ncomms2768

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

Journal Article · Tue Apr 23 00:00:00 EDT 2013 · Nature Communications

DOI:https://doi.org/10.1038/ncomms2768· OSTI ID:1623906

Wang, Jiangwei ^[1]; Sansoz, Frederic ^[2]; Huang, Jianyu ^[3]; Liu, Yi ^[4]; Sun, Shouheng ^[4]; Zhang, Ze ^[5]; Mao, Scott X. ^[6]

Univ. of Pittsburgh, PA (United States). Dept. of Mechanical Engineering and Materials Science; DOE/OSTI
Univ. of Vermont, Burlington, VT (United States). School of Engineering. Mechanical Engineering and Materials Science Programs
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
Brown Univ., Providence, RI (United States). Dept. of Chemistry
Zhejiang Univ., Hangzhou (China). State Key Laboratory of Silicon Materials. Dept. of Materials Science and Engineering
Univ. of Pittsburgh, PA (United States). Dept. of Mechanical Engineering and Materials Science

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 thicknesso2.8 nm) are shown to give rise to homogeneous dislocation nucleation and plastic shear localization, contrasting with the heterogeneous slip mechanism observed in single crystalline or low-density-twinned nanowires. The twin size dependent dislocation nucleation and deformation represent a new type of size effect distinct from the sample size effects described previously.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1623906

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 4; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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