PerspectiveMaterials Science

Watching the Nanograins Roll

See allHide authors and affiliations

Science  30 Jul 2004:
Vol. 305, Issue 5684, pp. 623-624
DOI: 10.1126/science.1101589

You are currently viewing the summary.

View Full Text

Log in to view the full text

Log in through your institution

Log in through your institution


Nanocrystalline metals with grain diameter less than 30 nanometers may exhibit a range of new and interesting deformation mechanisms. In his Perspective, Ma discusses the results reported in the same issue by Shan et al., who recorded motion of the nanograins during deformation of nickel samples using an in situ transmission electron microscopy technique. Unlike the normal plastic deformation governed by dislocation movement, significant grain rotation and grain boundary sliding were observed in the nanocrystalline nickel at room temperature. The Perspective gives a brief overview of the transition from dislocation-based to grain boundary-mediated plasticity in nanocrystalline grains.