Grain Boundary Sliding in Aluminum Nano-Bi-Crystals Deformed at Room Temperature

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Room-temperature uniaxial compressions of 900-nm-diameter aluminum bi-crystals, each containing a high-angle grain boundary with a plane normal inclined at 24 degrees to the loading direction, revealed frictional sliding along the boundary plane to be the dominant deformation mechanism. The top crystallite sheared off as a single unit in the course of compression instead of crystallographic slip and extensive dislocation activity, as would be expected. Compressive stress strain data of deforming nano bicrystals was continuous, in contrast to single crystalline nano structures that show a stochastic stress strain signature, and displayed a peak in stress at the elastic limit of approximate to 176 MPa followed by gradual softening and a plateau centered around approximate to 125 MPa. An energetics-based physical model, which may explain observed room-temperature grain boundary sliding, in presented, and observations are discussed within the framework of crystalline nano-plasticity and defect microstructure evolution.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2014-01
Language
English
Article Type
Article
Citation

SMALL, v.10, no.1, pp.100 - 108

ISSN
1613-6810
DOI
10.1002/smll.201301060
URI
http://hdl.handle.net/10203/191173
Appears in Collection
NE-Journal Papers(저널논문)
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