Journal ArticleDOI
Atomic Mechanisms Governing the Elastic Limit and the Incipient Plasticity of Bending Si Nanowires
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TLDR
Both of the tensile surface atomic-steps and the compressive buckling initiated versatile ductile plastic dislocation events and are the physical origin of the asymmetric tensile-compressive properties of postelastic instabilities and the incipient plasticity.Abstract:
Individual single-crystalline Si nanowires (NWs) were bent by forming loops or arcs with different radius. Positional-resolved atomic level strain distribution (PRALSD) along both of the radial and axial directions were calculated and mapped directly from the atomic-resolution strained high-resolution electron microscopy (HREM) images of the bent Si NWs. For the first time, the neutral-strain axis shifted from the compressive zone to the tensile region was directly demonstrated from the PRALSD along the radial direction. Bending-induced ripple-buckling of the bent Si NW was observed and a significant strain variation along the bending axial direction in the compressive region was revealed. The tensile surface atomic steps and the compressive buckling are the physical origin of the asymmetric tensile-compressive properties of postelastic instabilities and the incipient plasticity. Both of the tensile surface atomic-steps and the compressive buckling initiated versatile ductile plastic dislocation events.read more
Citations
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Structural evolutions of metallic materials processed by severe plastic deformation
TL;DR: In this paper, a comprehensive review on important micro-structural evolutions and major microstructural features induced by SPD processing in single-phase metallic materials with face-centered cubic structures, body-centered cylindrical structures, and hexagonal close-packed structures, as well as in multi-phase alloys is provided.
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Colloquium: Structural, electronic, and transport properties of silicon nanowires
TL;DR: In this article, the theory of silicon nanowires is reviewed and the structural properties of these wires are discussed, emphasizing the close connection between the growth orientation, the cross-section and the bounding facets.
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Approaching the ideal elastic strain limit in silicon nanowires
Hongti Zhang,Jerry Tersoff,Shang Xu,Huixin Chen,Qiaobao Zhang,Kaili Zhang,Yong Yang,Chun-Sing Lee,King-Ning Tu,Ju Li,Yang Lu +10 more
TL;DR: It is shown that vapor-liquid-solid–grown single-crystalline Si nanowires with diameters of ~100 nm can be repeatedly stretched above 10% elastic strain at room temperature, approaching the theoretical elastic limit of silicon.
Journal ArticleDOI
Mechanical Properties of Si Nanowires as Revealed by in Situ Transmission Electron Microscopy and Molecular Dynamics Simulations
Dai-Ming Tang,Cuilan Ren,Ming-Sheng Wang,Xianlong Wei,Naoyuki Kawamoto,Chang Liu,Yoshio Bando,Masanori Mitome,Naoki Fukata,Dmitri Golberg +9 more
TL;DR: It was revealed that the mechanical behavior of Si NWs had been closely related to the wire diameter, loading conditions, and stress states, and the tensile strength showed a clear size dependence.
Journal ArticleDOI
In situ experimental mechanics of nanomaterials at the atomic scale
Lihua Wang,Ze Zhang,Xiaodong Han +2 more
TL;DR: Wang et al. as discussed by the authors reviewed how recent developments in transmission electron microscopy (TEM) techniques enable materials scientists to characterize, at the atomic scale, both the chemical composition of a nanomaterial and its deformation dynamics under stress and strain, in situ, and in real time.
References
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Bozhi Tian,Xiaolin Zheng,Thomas J. Kempa,Ying Fang,Nanfang Yu,Guihua Yu,Jinlin Huang,Charles M. Lieber +7 more
TL;DR: These coaxial silicon nanowire photovoltaic elements provide a new nanoscale test bed for studies of photoinduced energy/charge transport and artificial photosynthesis, and might find general usage as elements for powering ultralow-power electronics and diverse nanosystems.
Journal ArticleDOI
Tensile loading of ropes of single wall carbon nanotubes and their mechanical properties
TL;DR: The mechanical response of 15 single wall carbon nanotube (SWCNT) ropes under tensile load was measured and strain data were obtained and they broke at strain values of 5.3% or lower.