Deformation of FCC nanowires by twinning and slip

Park, Harold S.; Gall, Ken; Zimmerman, Jonathan A.

doi:10.1016/j.jmps.2006.03.006

Cited by 302 publications

(218 citation statements)

References 54 publications

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“…These snapshots indicate that slip is a dominating factor in the plastic deformation, which is evident by the stacking faults observed along {1 1 1} plane. The analogous phenomenon was observed in MD simulation using EAM [22]. Surface reorientation between the two parallel stacking faults is observed at the edge of the two side surfaces (Fig.…”

Section: Resultssupporting

confidence: 77%

“…Atomistic simulations have been widely used to study a variety of deformation mechanisms in nanometer-scale materials [10][11][12][13][14][20][21][22][23][24][25][26]. Tension-compression asymmetry [13], effects of temperature [16], size and strain rate effects [25] have been revealed as interesting phenomena.…”

Section: Introductionmentioning

confidence: 99%

“…Gall et al [20] predicted increasing nanowire strength with decreasing dimensional scale. In addition, the yield and fracture properties of the gold nanowires were investigated by molecular dynamics (MD) modeling using embedded atom method (EAM) [22]. Besides, the yield strength of nanowires was quantitatively predicted by MD simulations [22,23,25,26].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the yield and fracture properties of the gold nanowires were investigated by molecular dynamics (MD) modeling using embedded atom method (EAM) [22]. Besides, the yield strength of nanowires was quantitatively predicted by MD simulations [22,23,25,26]. The previous experiences suggested that the accurate modeling of stacking fault and surface energies is critical in capturing the fundamental deformation behaviors of nanowires.…”

Section: Introductionmentioning

confidence: 99%

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Atomistic simulation on size-dependent yield strength and defects evolution of metal nanowires

Yang

Zhao

2009

Computational Materials Science

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a b s t r a c tA simple derivation based on continuum mechanics is given, which shows the surface stress is critical for yield strength at ultra-small scales. Molecular dynamics (MD) simulations with modified embedded atom method (MEAM) are employed to investigate the mechanical behaviors of single-crystalline metal nanowires under tensile loading. The calculated yield strengths increasing with the decrease of the cross-sectional area of the nanowires are in accordance with the theoretical prediction. Reorientation induced by stacking faults is observed at the nanowire edge. In addition, the mechanism of yielding is discussed in details based on the snapshots of defects evolution. The nanowires in different crystallographic orientations behave differently in stretching deformation. This study on the plastic properties of metal nanowires will be helpful to further understanding of the mechanical properties of nanomaterials.

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Section: Resultssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Atomistic simulation on size-dependent yield strength and defects evolution of metal nanowires

Yang

Zhao

2009

Computational Materials Science

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“…[44][45][46] But recent experiments and simulations suggested that in single-crystalline nanopillars or NWs (with diameters typically less than ~200 nm), dislocations are relatively easily annihilated at free surfaces before they have the opportunity to interact (e.g., the gliding dislocations travel only very short distances before annihilating at a free surface), leading to no strain hardening. 24,[47][48][49] Nevertheless, our results clearly show the strain hardening in five-fold twinned Ag NWs (Figure 2a). MD simulations of five-fold twinned NWs predicted that partial dislocations are nucleated from surfaces and glide towards the NW center following a {111}/<112> slip system.…”

Section: Resultsmentioning

confidence: 63%

Size effects on elasticity, yielding, and fracture of silver nanowires:In situexperiments

et al. 2012

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This paper reports the first quantitative measurement of a full spectrum of mechanical properties of five-fold twinned silver (Ag) nanowires (NWs) including Young's modulus, yield strength and ultimate tensile strength. In situ tensile testing of Ag NWs with diameters between 34 and 130 nm was carried out inside a scanning electron microscope (SEM). Young's modulus, yield strength and ultimate tensile strength all increased as the NW diameter decreased. The maximum yield strength in our tests was found to be 2.64 GPa, which is about 50 times the bulk value and close to the theoretical value of Ag in the <110> orientation. The size effect in the yield strength is attributed to the increase in the Young's modulus. Yield strain scales reasonably well with the NW surface area, which reveals that yielding of Ag NWs is due to dislocation nucleation from surface sources. Pronounced strain hardening was observed for most NWs in our study. The strain hardening, which has not previously been reported for NWs, is mainly attributed to the presence of internal twin boundaries. KEYWORDSfive-fold twin, size effect, Young's modulus, yield strength, ultimate tensile strength, strain hardening

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