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Mechanical properties of Au nanowires under uniaxial tension with high strain-rate bymolecular dynamics.

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Title: Mechanical properties of Au nanowires under uniaxial tension with high strain-rate bymolecular dynamics.
Authors: Dao-Long DC Chen, Tei-Chen TC Chen
Source: Nanotechnology. Dec2005, Vol. 16 Issue 12, p2972-2981. 10p.
Subjects: Nanowires, Distribution (Probability theory), Micromechanics, Continuous functions
Abstract: The deformation behaviour of Au nanowires subjected to uniaxial tension athigh strain-rate under different temperatures is studied by molecular dynamicssimulation along [001], [011], and [111] elongation directions, respectively. The stressdistributions and the radial distribution functions of the structure of the nanowires areevaluated and discussed. It is seen that the stress–strain curves are quite differentfrom those of the bulk material. Moreover, the microstructures of nanowires aretransformed first from FCC to face-centred-orthorhombic-like crystalline, and thenchanged to the amorphous state. The first neighbouring distance in the radialdistribution functions along the [001] direction is clearly split into two peaks. Itappears that the ductility of the nanowires at high strain-rate is higher than thecorresponding macroscopic cases. The magnitudes of Young’s modulus and themaximum strength along different crystalline directions are evaluated and comparedwith each other. They tend to decrease as the temperature increases. It may bepredicted from our simulations that the conductance at high strain-rate deformationmay be a continuous function of elongation due to the smooth reduction of area. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The deformation behaviour of Au nanowires subjected to uniaxial tension athigh strain-rate under different temperatures is studied by molecular dynamicssimulation along [001], [011], and [111] elongation directions, respectively. The stressdistributions and the radial distribution functions of the structure of the nanowires areevaluated and discussed. It is seen that the stress–strain curves are quite differentfrom those of the bulk material. Moreover, the microstructures of nanowires aretransformed first from FCC to face-centred-orthorhombic-like crystalline, and thenchanged to the amorphous state. The first neighbouring distance in the radialdistribution functions along the [001] direction is clearly split into two peaks. Itappears that the ductility of the nanowires at high strain-rate is higher than thecorresponding macroscopic cases. The magnitudes of Young’s modulus and themaximum strength along different crystalline directions are evaluated and comparedwith each other. They tend to decrease as the temperature increases. It may bepredicted from our simulations that the conductance at high strain-rate deformationmay be a continuous function of elongation due to the smooth reduction of area. [ABSTRACT FROM AUTHOR]
ISSN:09574484
DOI:10.1088/0957-4484/16/12/041