User login

You are here

Surface mediated plasticity in sub-10-nm-sized gold crystals

Nature Communications 1, Article number:144 | DOI:10.1038/ncomms1149

Although deformation processes in submicron-sized metallic crystals are
well documented, the direct observation of deformation mechanisms in
crystals with dimensions below the sub-10-nm range is currently lacking.
Here, through in situ high-resolution transmission electron
microscopy (HRTEM) observations, we show that (1) in sharp contrast to
what happens in bulk materials, in which plasticity is mediated by
dislocation emission from Frank-Read sources and multiplication, partial
dislocations emitted from free surfaces dominate the deformation of
gold (Au) nanocrystals; (2) the crystallographic orientation (Schmid
factor) is not the only factor in determining the deformation mechanism
of nanometre-sized Au; and (3) the Au nanocrystal exhibits a phase
transformation from a face-centered cubic to a body-centered tetragonal
structure after failure. These findings provide direct experimental
evidence for the vast amount of theoretical modelling on the deformation
mechanisms of nanomaterials that have appeared in recent years.

Subscribe to Comments for "Surface mediated plasticity in sub-10-nm-sized gold crystals"

Recent comments

More comments

Syndicate

Subscribe to Syndicate