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Deformation of FCC Nanowires by Twinning and Slip

Harold S. Park's picture

We present atomistic simulations of the tensile and compressive loading of single crystal FCC nanowires with <100> and <110> orientations to study the propensity of the nanowires to deform via twinning or slip.  By studying the deformation characteristics of three FCC materials with disparate stacking fault energies (gold, copper and nickel), we find that the deformation mechanisms in the nanowires are a function of the intrinsic material properties, applied stress state, axial crystallographic orientation and exposed transverse surfaces.  The key finding of this work is the first order effect that side surface orientation has on the operant mode of inelastic deformation in both <100> and <110> nanowires.  Comparisons to expected deformation modes, as calculated using crystallographic Schmid factors for tension and compression, are provided to illustrate how transverse surface orientations can directly alter the deformation mechanisms in materials with nanometer scale dimensions.

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Comments

Extraordinary writing. As usual. The pictures could be vectorial though. They look good, but we can see the pixels.

P. Areias

Henry Tan's picture

how are the stresses and strains calculated in Figure 9, 10 and 11, of nanowires loaded in tension and compression?

Harold S. Park's picture

Hi Henry - they are calculated using the virial theorem.

 

Regards,

Harold

Henry Tan's picture

The virial method applies only to system in equilibrium. Your simulations are in dynamic processes.

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