Twin deformation mechanism of defect-free Au nanowires

Title
Twin deformation mechanism of defect-free Au nanowires
Authors
안재평서종현윤상원성태연최인석이건배
Keywords
Nanowire; Au; twin deformation; rotation; stacking fault
Issue Date
2011-11
Publisher
Symposium of Korean Institute of Metals and Japan Institue of Metals
Abstract
The recent molecular dynamics works predicted the existence of strong but ductile behavior of metal nanowires achieved by deformation twinning. Unfortunately, previous experiments only observed high strength but brittle fracture in nanowires. Thus, the presence of ductile deformation in nanowires by structural transformation is in question and the deformation mechanism of nanowire proposed by atomic scale simulations is still controversial. In this study, we report ultra-strong but ductile deformation behavior of gold nanowires by structural transformation through deformation twinning through the tensile test using Nanomanipulator (MM3A, Kleidiek) equipped in Focused Ion Beam (Quanta 3D, FEI) as well as the observation of the each deforming steps and fracture region using transmission electron microscope (Titan80-300, FEI). We observed real time twin nucleation and twin migration leading to the transformation of the entire shape and orientation of gold nanowires using our insitu tensile test. The Au nanowire was governed by the multiple twin deformation of {111}<112> at initial stress state.
URI
http://pubs.kist.re.kr/handle/201004/41222
Appears in Collections:
KIST Publication > Conference Paper
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