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Mechanical characterization of Co/Cu multilayered nanowires
J C Jiménez-Sáez1, A M C Pérez-Martin, J J Jiménez-Rodríguez
1Dpto. de Física y Química Aplicadas a la Técnica Aeronáutica, E. U. I. T Aeroncutica, Universidad Politécnica de Madrid (UPM), E-28040 Madrid, Spain.
Journal of Nanoscience and Nanotechnology
|August 22, 2012
Summary
Mechanical properties of Cobalt/Copper (Co/Cu) nanowires were simulated using Molecular Dynamics. Nanowire strength significantly increases at small sizes, with temperature and copper layer thickness impacting performance.
Area of Science:
- Materials Science
- Nanotechnology
- Computational Physics
Background:
- Multilayered nanowires offer unique mechanical properties due to their high surface area to volume ratio.
- Understanding the deformation mechanisms of Cobalt/Copper (Co/Cu) nanowires is crucial for designing advanced nanomaterials.
Purpose of the Study:
- To investigate the mechanical deformation properties of (110) Co/Cu multilayered nanowires under uniaxial stress.
- To analyze the influence of temperature, strain rate, and layer thickness on the elastic modulus and yield stress.
Main Methods:
- Molecular Dynamics (MD) simulations were employed to model the behavior of Co/Cu nanowires.
- The interatomic potential for the immiscible CoCu system was described using a second-moment tight-binding approximation.
Main Results:
- Elastic modulus and yield stress were largely independent of strain rate but decreased linearly with increasing temperature.
- Nanowire mechanical properties significantly increased at low volume-to-surface-area ratios, diverging from bulk values.
- Increased copper sublayer thickness led to a decrease in Young's modulus and a steep drop in yield stress due to lattice distortion in copper.
Conclusions:
- Co/Cu nanowire mechanical properties are size-dependent, showing enhanced strength at the nanoscale.
- Temperature and copper content significantly influence the deformation behavior and mechanical strength of these nanowires.
- Deformation mechanisms differ between tensile (partial dislocations) and compressive (partial and full dislocations) stress states.
