Plastic deformation of materials occurs by the motion of defects known as dislocations and
disclinations. High-resolution transmission electron microscopy was used to directly reveal …

The size of nanocrystals provides a limitation on dislocation activity and associated stress-
induced deformation. Dislocation-mediated plastic deformation is expected to become …

In polycrystalline metals, plastic deformation is accompanied by lattice rotations resulting
from dislocation glide. Following these rotations in three dimensions requires nondestructive …

We report transmission electron microscope observations that provide evidence of
deformation twinning in plastically deformed nanocrystalline aluminum. The presence of …

The plastic behavior of crystalline materials is mainly controlled by the nucleation and
motion of lattice dislocations. We report in situ dynamic transmission electron microscope …

Plastic deformation in coarse-grained metals is governed by dislocation-mediated
processes. These processes lead to the accumulation of a residual dislocation network …

During plastic deformation of metals and alloys, dislocations arrange in ordered patterns.
How and when these self-organization processes take place have remained elusive …

It is believed that the dynamics of dislocation processes during the deformation of
nanocrystalline materials can only be visualized by computational simulations. Here we …

In nanocrystalline metals, lack of intragranular dislocation sources leads to plastic
deformation mechanisms that substantially differ from those in coarse-grained metals …

We observe that a nanostructured metal can be hardened by annealing and softened when
subsequently deformed, which is in contrast to the typical behavior of a metal …