Mechanical Properties of Si Nanowires as Revealed by in Situ Transmission Electron Microscopy and Molecular Dynamics Simulations

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	Mechanical Properties of Si Nanowires as Revealed by in Situ Transmission Electron Microscopy and Molecular Dynamics Simulations
	D. M. Tang; C. L. Ren; M. S. Wang; X. L. Wei; N. Kawamoto; C. Liu; Y. Bando; M. Mitome; N. Fukata; D. Golberg
	2012
发表期刊	Nano Letters
ISSN	1530-6984
卷号	12 期号:4 页码:1898-1904
摘要	Deformation and fracture mechanisms of ultrathin Si nanowires (NWs), with diameters of down to similar to 9 nm, under uniaxial tension and bending were investigated by using in situ transmission electron microscopy and molecular dynamics simulations. It was revealed that the mechanical behavior of Si NWs had been closely related to the wire diameter, loading conditions, and stress states. Under tension, Si NWs deformed elastically until abrupt brittle fracture. The tensile strength showed a clear size dependence, and the greatest strength was up to 11.3 GPa. In contrast, under bending, the Si NWs demonstrated considerable plasticity. Under a bending strain of <14%, they could repeatedly be bent without cracking along with a crystalline-to-amorphous phase transition. Under a larger strain of >20%, the cracks nucleated on the tensed side and propagated from the wire surface, whereas on the compressed side a plastic deformation took place because of dislocation activities and an amorphous transition.
部门归属	[ren, cui-lan; liu, chang] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [tang, dai-ming; wang, ming-sheng; wei, xianlong; kawamoto, naoyuki; bando, yoshio; mitome, masanori; fukata, naoki; golberg, dmitri] natl inst mat sci, int ctr mat nanoarchitecton mana, tsukuba, ibaraki 3050044, japan.;liu, c (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china.;cliu@imr.ac.cn; golberg.dmitri@nims.go.jp
关键词	Silicon Nanowires Nanomechanics In Situ Electron Microscopy Tensile Bending Size Effects To-ductile Transition Boron-nitride Nanotubes Large-strain Plasticity Silicon Nanowires Carbon Nanotubes Semiconductor Nanowires Ws2 Nanotubes Tensile Tests Strength Brittle
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60257
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	D. M. Tang,C. L. Ren,M. S. Wang,et al. Mechanical Properties of Si Nanowires as Revealed by in Situ Transmission Electron Microscopy and Molecular Dynamics Simulations[J]. Nano Letters,2012,12(4):1898-1904.
APA	D. M. Tang.,C. L. Ren.,M. S. Wang.,X. L. Wei.,N. Kawamoto.,...&D. Golberg.(2012).Mechanical Properties of Si Nanowires as Revealed by in Situ Transmission Electron Microscopy and Molecular Dynamics Simulations.Nano Letters,12(4),1898-1904.
MLA	D. M. Tang,et al."Mechanical Properties of Si Nanowires as Revealed by in Situ Transmission Electron Microscopy and Molecular Dynamics Simulations".Nano Letters 12.4(2012):1898-1904.