Abstract
The failure of the metallic nanowire has raised concerns due to its applied reliability in nanoelectromechanical system. In this article, the breaking failure is studied for the [100], [110], and [111] single-crystal copper nanowires at different strain rates. The statistical breaking position distributions of the nanowires have been investigated to give the effects of strain rate and crystallographic orientation on micro-atomic fluctuation in the symmetric stretching of the nanowires. When the strain rate is less than 0.26% ps-1, macro-breaking position distributions exhibit the anisotropy of micro-atomic fluctuation. However, when the strain rate is larger than 3.54% ps-1, the anisotropy is not obvious because of strong symmetric shocks.
Highlights
In recent years, the metallic nanowires applied as nanoconnectors [1] and the active components of nanoelectromechanical system (NEMS) devices [2,3] have attracted extensive interests owing to their special mechanical [4], thermal [5], electrical [6], and magnetic [7] properties
It is known that crystallographic orientation is related with structural anisotropy and symmetric stretching at different strain rates will generate different mechanical shocks, but we do not know which factor will dominate the deformation and the breaking failure mechanism of the nanowires? In order to make the question clear, we focused on the molecular dynamics (MD) simulation investigation of the tensile deformation and breaking failure of the single-crystal copper nanowires under the effects of crystallographic orientation and strain rate
In summary, we have simulated the [100], [110], and [111] single-crystal copper nanowires subjected to symmetric stretching at strain rates from 0.01 to 7.69% ps-1, and we have studied the deformation behaviors, mechanical properties, and their breaking position distributions
Summary
The metallic nanowires applied as nanoconnectors [1] and the active components of nanoelectromechanical system (NEMS) devices [2,3] have attracted extensive interests owing to their special mechanical [4], thermal [5], electrical [6], and magnetic [7] properties. Ikeda et al [20] proposed amorphization in nickel nanowire induced by high strain rate These studies indicate strain-rate effects on the deformation of the single-crystal metallic nanowires. For the single-crystal materials, we noticed that the plastic response in copper could occur rapidly [21,22] According to this point, studying the deformation and breaking failure of the copper single-crystal nanowires shall be of vital importance for developing and processing the nanoscale systems based on metallic nanowires. In order to make the question clear, we focused on the MD simulation investigation of the tensile deformation and breaking failure of the single-crystal copper nanowires under the effects of crystallographic orientation and strain rate It is known that crystallographic orientation is related with structural anisotropy and symmetric stretching at different strain rates will generate different mechanical shocks, but we do not know which factor will dominate the deformation and the breaking failure mechanism of the nanowires? In order to make the question clear, we focused on the MD simulation investigation of the tensile deformation and breaking failure of the single-crystal copper nanowires under the effects of crystallographic orientation and strain rate
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