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

Author

Listed:
  • He Zheng

    (University of Pittsburgh
    School of Physics and Technology, Center for Electron Microscopy and MOE Key Laboratory of Artificial Micro- and Nano-structures, Wuhan University)

  • Ajing Cao

    (Northwestern University)

  • Christopher R. Weinberger

    (Materials Science and Engineering Center, Sandia National Laboratories)

  • Jian Yu Huang

    (Center for Integrated Nanotechnologies, Sandia National Laboratories)

  • Kui Du

    (Shenyang National Laboratory for Materials Science, Institute of Metal Research, CAS)

  • Jianbo Wang

    (School of Physics and Technology, Center for Electron Microscopy and MOE Key Laboratory of Artificial Micro- and Nano-structures, Wuhan University)

  • Yanyun Ma

    (Washington University)

  • Younan Xia

    (Washington University)

  • Scott X. Mao

    (University of Pittsburgh)

Abstract

Although deformation processes in submicron-sized metallic crystals are well documented, the direct observation of deformation mechanisms in crystals with dimensions below the sub-10-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.

Suggested Citation

  • He Zheng & Ajing Cao & Christopher R. Weinberger & Jian Yu Huang & Kui Du & Jianbo Wang & Yanyun Ma & Younan Xia & Scott X. Mao, 2010. "Discrete plasticity in sub-10-nm-sized gold crystals," Nature Communications, Nature, vol. 1(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:1:y:2010:i:1:d:10.1038_ncomms1149
    DOI: 10.1038/ncomms1149
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    Cited by:

    1. Chengpeng Yang & Bozhao Zhang & Libo Fu & Zhanxin Wang & Jiao Teng & Ruiwen Shao & Ziqi Wu & Xiaoxue Chang & Jun Ding & Lihua Wang & Xiaodong Han, 2023. "Chemical inhomogeneity–induced profuse nanotwinning and phase transformation in AuCu nanowires," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
    2. Shufen Chu & Pan Liu & Yin Zhang & Xiaodong Wang & Shuangxi Song & Ting Zhu & Ze Zhang & Xiaodong Han & Baode Sun & Mingwei Chen, 2022. "In situ atomic-scale observation of dislocation climb and grain boundary evolution in nanostructured metal," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    3. Li Zhong & Yin Zhang & Xiang Wang & Ting Zhu & Scott X. Mao, 2024. "Atomic-scale observation of nucleation- and growth-controlled deformation twinning in body-centered cubic nanocrystals," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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