Discrete plasticity in sub-10-nm-sized gold crystals

Zheng, He; Cao, Ajing; Weinberger, Christopher R.; Huang, Jian Yu; Du, Kui; Wang, Jianbo; Ma, Yanyun; Xia, Younan; Mao, Scott X.

doi:10.1038/ncomms1149

Discrete plasticity in sub-10-nm-sized gold crystals

Journal Article · Wed Dec 01 00:00:00 EST 2010 · Nature Communications

DOI:https://doi.org/10.1038/ncomms1149· OSTI ID:1623835

Zheng, He ^[1]; Cao, Ajing ^[2]; Weinberger, Christopher R. ^[3]; Huang, Jian Yu ^[4]; Du, Kui ^[5]; Wang, Jianbo ^[6]; Ma, Yanyun ^[7]; Xia, Younan ^[7]; Mao, Scott X. ^[8]

Univ. of Pittsburgh, PA (United States). Dept. of Mechanical Engineering and Materials Science; Wuhan Univ. (China). MOE Key Laboratory of Artificial Micro- and Nano-structures. Center for Electron Microscopy. School of Physics and Technology; DOE/OSTI
Northwestern Univ., Evanston, IL (United States). Dept. of Civil and Environmental Engineering
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Materials Science and Engineering Center
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
Shenyang National Lab. for Materials Science (China). Inst. of Metal Research
Wuhan Univ. (China). MOE Key Laboratory of Artificial Micro- and Nano-structures. Center for Electron Microscopy. School of Physics and Technology
Washington Univ., St. Louis, MO (United States). Dept. of Biomedical Engineering
Univ. of Pittsburgh, PA (United States). Dept. of Mechanical Engineering and Materials Science

Although deformation processes in submicron-sized metallic crystals are well documented, the direct observation of deformation mechanisms in crystals with dimensions below the sub10-nm range is currently lacking. Here, through in situ high-resolution transmission electron microscopy (HRTEM) observations, we show that (1) in sharp contrast to what happens in bulk materials, in which plasticity is mediated by dislocation emission from Frank-Read sources and multiplication, partial dislocations emitted from free surfaces dominate the deformation of gold (Au) nanocrystals; (2) the crystallographic orientation (Schmid factor) is not the only factor in determining the deformation mechanism of nanometre-sized Au; and (3) the Au nanocrystal exhibits a phase transformation from a face-centered cubic to a body-centered tetragonal structure after failure. These findings provide direct experimental evidence for the vast amount of theoretical modelling on the deformation mechanisms of nanomaterials that have appeared in recent years.

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:: 1623835

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

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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