Volume 95, Number 6, September 2011
|Number of page(s)||5|
|Section||Atomic, Molecular and Optical Physics|
|Published online||26 August 2011|
Understanding large plastic deformation of SiC nanowires at room temperature
Department of Mechanical Engineering, Curtin University - Perth, WA 6845, Australia
2 School of Physics and Nuclear Energy Engineering, Beihang University - Beijing 100191, China
3 School of Aeronautics Science and Engineering, Beihang University - Beijing 100191, China
4 State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences - Beijing 100190, China
5 Department of Manufacturing Engineering and Engineering Management (MEEM), City University of Hong Kong - Kowloon, Hong Kong, China
6 School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney Sydney, NSW 2006, Australia
7 School of Engineering, Brown University - Providence, RI 02912, USA
Accepted: 26 July 2011
Tensile behaviors of SiC  nanowires with various possible microstructures have been investigated by molecular-dynamics simulations. The results show that the large plastic deformation in these nanowires is induced by the anti-parallel sliding of 3C grains along an ultra-thin intergranular amorphous film parallel to the plane and inclined at an angle of 19.47○ with respect to the nanowire axis. The resulting large plastic deformation of SiC nanowires at room temperature is attributed to the stretching, breaking and re-forming of Si–C bonds in the intergranular amorphous film, which is also evident from the sawtooth jumps in the stress-strain response.
PACS: 31.15.xv – Molecular dynamics and other numerical methods / 62.25.-g – Mechanical properties of nanoscale systems / 62.23.Hj – Nanowires
© EPLA, 2011
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