Acta Mechanica Sinica

, Volume 33, Issue 4, pp 792–800 | Cite as

Size and strain rate effects in tensile strength of penta-twinned Ag nanowires

Research Paper

Abstract

Penta-twinned Ag nanowires (pt-AgNWs) have recently attracted much attention due to their interesting mechanical and physical properties. Here we perform large-scale atomistic simulations to investigate the influence of sample size and strain rate on the tensile strength of pt-AgNWs. The simulation results show an apparent size effect in that the nanowire strength (defined as the critical stress for dislocation nucleation) increases with decreasing wire diameter. To account for such size effect, a theoretical model involving the interaction between an emerging dislocation and the twin boundary has been developed for the surface nucleation of dislocations. It is shown that the model predictions are in quantitative agreement with the results from atomistic simulations and previous experimental studies in the literatures. The simulations also reveal that nanowire strength is strain-rate dependent, which predicts an activation volume for dislocation nucleation in the range of 1–10\(b^{3}\), where b is the magnitude of the Burgers vector for a full dislocation.

Keywords

Penta-twinned nanowire Size effect Strain rate effect Dislocation nucleation Atomistic simulation 

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Centre of Advanced Mechanics and Materials, Department of Engineering MechanicsTsinghua UniversityBeijingChina
  2. 2.School of EngineeringBrown UniversityProvidenceUSA

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