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Elucidating asymmetric yield behavior of copper nano-wires during tensile and compressive load
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10.1063/1.4822021
    Wei-Ting Liu (劉威廷)1, Chun-I Hsiao (蕭群逸)1,2 and Wen-Dung Hsu (許文東)1,2,3,4,a)
    + View Affiliations - Hide Affiliations
    Affiliations:
    1 Department of Materials Science and Engineering, National Cheng Kung University, Tainan City 70101, Taiwan
    2 Promotion Center for Global Materials Research, National Cheng Kung University, Tainan City 70101, Taiwan
    3 Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan City 70101, Taiwan
    4 Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan City 70101, Taiwan
    a) Author to whom correspondence should be addressed. Electronic mail: wendung@mail.ncku.edu.tw.
    J. Appl. Phys. 114, 143503 (2013); http://dx.doi.org/10.1063/1.4822021
/content/aip/journal/jap/114/14/10.1063/1.4822021
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/14/10.1063/1.4822021
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Equilibrate structure of the copper nano-wire models. The diameter of the nano-wires from left to right is 2 nm, 2.5 nm, 3 nm, 6 nm, and 10 nm, respectively. The green atoms are FCC structure atoms and the blue atoms are unidentified structure atoms.

Image of FIG. 2.
FIG. 2.

(a) The spacing between NN atoms and (b) the stress in z direction (σ) of atoms in various radial location along ⟨110⟩ direction of nano-wires. The inset in (b) is the potential energy of individual atoms. The black dash lines indicate the corresponding property of bulk copper.

Image of FIG. 3.
FIG. 3.

Illustration of the contraction ratio versus diameter response in the nano-wires. The inset illustrates the proportion of surface atoms versus diameter. The filled squares are the calculated values, and the red line is the fitted curve.

Image of FIG. 4.
FIG. 4.

The calculated stress-strain curve of copper nano-wires with different diameters. The inset plots the slope of stress-strain curves, which represents the instantaneous elastic modulus of copper nano-wires.

Image of FIG. 5.
FIG. 5.

Snapshots of stacking fault nucleation at yield point; (a) front view, and (b) cross-sectional view during tension; (c) front view, and (d) cross-sectional view during compression. The green atoms are FCC structure atoms and the blue atoms are unidentified structure atoms. The red atoms are HCP structure atoms representing the formation of stacking fault.

Image of FIG. 6.
FIG. 6.

Average atomic level potential energy of (a) surface atoms, (b) sub-surface atoms, and (c) internal atoms along ⟨110⟩ directions of various copper nano-wires during tensile and compressive load.

Image of FIG. 7.
FIG. 7.

Average atomic level stress-strain curve for atoms from (a) surface layer, (b) sub-surface layer, and (c) internal layers on ⟨110⟩ directions of various copper nano-wires during tensile and compressive load.

Image of FIG. 8.
FIG. 8.

Volume change ratio versus strain of various copper nano-wires. The inset shows volume change ratio of nano-wire with 6.0 nm diameter (blue line) and the predicted curve obtained by a constant Poisson's ratio 0.34 (brown line).

Image of FIG. 9.
FIG. 9.

Calculated Poisson's ratio of various copper nano-wires as a function of strain.

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/content/aip/journal/jap/114/14/10.1063/1.4822021
2013-10-07
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Elucidating asymmetric yield behavior of copper nano-wires during tensile and compressive load
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/14/10.1063/1.4822021
10.1063/1.4822021
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