Mechanical behaviors of nanowires

Chen, Yujie; An, Xianghai; Liao, Xiaozhou

doi:10.1063/1.4989649

Cited by 59 publications

(44 citation statements)

References 247 publications

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“…They were extracted from Video S1 in the Supplementary material and show that the deformation was uniaxial without any traces of bending. This behaviour is different from the one obtained from compression-based deformation [23,24,34], in which bending is always present. The SEM micrographs of InP TSL nanowire before and after fracture are shown in Figures 3f and g, respectively.…”

Section: In Situ Tem Mechanical Deformationcontrasting

confidence: 90%

Mechanical Behavior of InP Twinning Superlattice Nanowires

et al. 2019

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Taper-free InP twinning superlattice (TSL) nanowires with an average twin spacing of ~ 13 nm were grown along the zinc-blende close-packed [111] direction using metalorganic vapor phase epitaxy. The mechanical properties and fracture mechanisms of individual InP TSL nanowires in tension were ascertained by means of in situ uniaxial tensile tests in a transmission electron microscope. The elastic modulus, failure strain and tensile strength along the [111] direction were determined. No evidence of inelastic deformation mechanisms was found before fracture, which took place in a brittle manner along the twin boundary. The experimental results were supported by molecular dynamics simulations of the tensile deformation of the nanowires that also showed that the fracture of twinned nanowires occurred in the absence of inelastic deformation mechanisms by the propagation of a crack from the nanowire surface along the twin boundary. Fig. S1. 1 -8: Tensile sample preparation of TSL InP nanowires, and 9 -11: In situ mechanical testing of nanowires in a transmission electron microscope (TEM).

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Section: In Situ Tem Mechanical Deformationcontrasting

confidence: 90%

Mechanical Behavior of InP Twinning Superlattice Nanowires

et al. 2019

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“…In view of the small size of nanowires, performing the accurate mechanical testing of nanowires is still challenging due to the difficulties in sample preparation, clamping and aligning the nanowire axial direction with loading direction [4]. This complexities in experimental techniques preclude the conventional methods and lend towards theoretical/computational tools.…”

Section: Introductionmentioning

confidence: 99%

Effect of orientation and mode of loading on deformation behaviour of Cu nanowires

Rohith

Sainath

Choudhary

2018

Computational Condensed Matter

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Molecular dynamics simulations have been performed to understand the variations in deformation mechanisms of Cu nanowires as a function of orientation and loading mode (tension or compression). Cu nanowires of different crystallographic orientations distributed uniformly on the standard stereographic triangle have been considered under tensile and compressive loading. The simulation results indicate that under compressive loading, the orientations close to <100> corner deform by twinning mechanism, while the remaining orientations deform by dislocation slip. On the other hand, all the nanowires deform by twinning mechanism under tensile loading. Further, the orientations close to <110> and <111> corner exhibit tensioncompression asymmetry in deformation mechanisms. In addition to deformation mechanisms, Cu nanowires also display tension-compression asymmetry in yield stress. The orientations close to <001> corner exhibits higher yield stress in tension than in compression, while the opposite behaviour (higher yield stress in compression than in tension) has been observed in orientations close to <110> and <111> corners. For the specific orientation of <102>, the yield stress asymmetry has not been observed. The tension-compression asymmetry in deformation mechanisms has been explained based on the parameter α M , defined as the ratio of Schmid factors for leading and trailing partial dislocations. Similarly, the asymmetry in yield stress values has been attributed to the different Schmid factor values for leading partial dislocations under tensile and compressive loading.

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“…In contrast to the elasticity-dominated responses of semiconductor nanomaterials 11 , metallic nanomaterials commonly experience non-conservative defect activities associated with frequent heterogeneous surface nucleation 12 . The resultant irreversible shear localization and structural degradation 13 notoriously compromise their service reliability 14,15 . Hence, the structural stability and damage resistance of metallic nanocomponents need to be precisely engineered to fundamentally retard the cumulative degradation 16 .…”

mentioning

confidence: 99%

Metallic nanocrystals with low angle grain boundary for controllable plastic reversibility

et al. 2020

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Advanced nanodevices require reliable nanocomponents where mechanically-induced irreversible structural damage should be largely prevented. However, a practical methodology to improve the plastic reversibility of nanosized metals remains challenging. Here, we propose a grain boundary (GB) engineering protocol to realize controllable plastic reversibility in metallic nanocrystals. Both in situ nanomechanical testing and atomistic simulations demonstrate that custom-designed low-angle GBs with controlled misorientation can endow metallic bicrystals with endurable cyclic deformability via GB migration. Such fully reversible plasticity is predominantly governed by the conservative motion of Shockley partial dislocation pairs, which fundamentally suppress damage accumulation and preserve the structural stability. This reversible deformation is retained in a broad class of face-centred cubic metals with low stacking fault energies when tuning the GB structure, external geometry and loading conditions over a wide range. These findings shed light on practical advances in promoting cyclic deformability of metallic nanomaterials.

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Mechanical behaviors of nanowires

Cited by 59 publications

References 247 publications

Mechanical Behavior of InP Twinning Superlattice Nanowires

Mechanical Behavior of InP Twinning Superlattice Nanowires

Effect of orientation and mode of loading on deformation behaviour of Cu nanowires

Metallic nanocrystals with low angle grain boundary for controllable plastic reversibility

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