Surface and interface controlled yielding and plasticity in fivefold twinned Ag nanowires

Sun, Mingfei; Cao, Ronggen; Xiao, Fei; Deng, Chuang

doi:10.1016/j.commatsci.2013.06.021

Cited by 16 publications

(4 citation statements)

References 29 publications

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“…In addition, mechanical properties of NWs are also sensitive to dimensional variations. Prior studies have shown that the surface morphology of NWs, such as surface grooves, can affect their mechanical behaviors [26,27].…”

Section: Introductionmentioning

confidence: 99%

In situ study on surface roughening in radiation-resistant Ag nanowires

Shang

Fan

et al. 2018

Nanotechnology

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Metallic materials subjected to heavy ion irradiation experience significant radiation damage. Free surface is a type of effective defect sinks to improve the radiation resistance in metallic materials. However, the radiation resistance of metallic nanowires (NWs) is largely unknown. Here we show, via in situ Kr ion irradiations in a transmission electron microscope, Ag NWs exhibited much better radiation resistance than coarse-grained Ag. Irradiation-induced prominent surface roughening in Ag NWs provides direct evidence for interaction between defect clusters and free surface. Diameter dependent variation of the surface roughness in irradiated Ag NWs has also been observed. This study provides insight on mechanisms of enhanced radiation resistance via free surfaces in metallic NWs.

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Section: Introductionmentioning

confidence: 99%

In situ study on surface roughening in radiation-resistant Ag nanowires

Shang

Fan

et al. 2018

Nanotechnology

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“…Numerous computational and experimental studies have been devoted to examining the plasticity of penta-twinned nanowires (Cao and Wei, 2006;Wu et al, 2011;Filleter et al, 2012;Sun et al, 2013;Zheng et al, 2014). It was found that the yield of the nanowire initiates with dislocation nucleation from the surface, and plastic deformation is accommodated by a chain of stacking fault decahedrons (SFD) or stacking fault hats (SFH).…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Study on the Distributed Plasticity of Penta-Twinned Silver Nanowires

Lee

Ryu

2015

Front. Mater.

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The distributed plasticity of pentatwinned silver nanowires has been revealed in recent computational and experimental studies. However, the molecular dynamics (MD) simulations have not considered the imperfections seen in experiments, such as irregular surface undulations, the high aspect ratio of nanowires, and the stiffness of loading devices. In this work, we report the effect of such inherent imperfections on the distributed plasticity of penta-twinned silver nanowires in MD simulations. We find that the distributed plasticity occurs for nanowires having undulations that are less than 5% of the nanowire diameter. The elastic stress field induced by a stacking fault promotes the nucleation of successive stacking fault decahedrons (SFDs) at long distance, making it hard for necking to occur. By comparing the tensile simulation using the steered molecular dynamics method with the tensile simulation with periodic boundary condition (PBC), we show that a sufficiently long nanowire must be used in the constant strain rate simulations with PBC, because the plastic displacement burst caused by the SFD formation induces compressive stress, promoting the removal of other SFDs. Our finding can serve as a guidance for the MD simulation of crystalline materials with large plastic deformation and in the design of mechanically reliable devices based on silver nanowires.

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“…Previous studies have shown how spatially resolved diffraction methods (ACOM/SPED /4D-STEM) [1] [2] can provide a wealth of information for characterization of complex nanowires. [3] In this study networks of silver nanowires with the 'penta-twinned' nanostructure [4] were subjected to a range of fatigue cycling to explore both the microscopic change in network structure but also to correlate this with the change in electrical conductivity of the network, which allows the change in network connectivity to be modelled. Furthermore, the networks were produced on holey polycarbonate substrates that could be to allow before and after characterization of the wires and networks.…”

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confidence: 99%