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Dislocation dynamics in nanocrystalline nickel.

Z W Shan1, J M K Wiezorek, E A Stach

  • 1Department of Mechanical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA.

Physical Review Letters
|March 16, 2007
PubMed
Summary
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Researchers visualized dislocation dynamics in nanocrystalline nickel (Ni) using advanced microscopy. They observed trapped dislocations in tiny 5 nm grains, challenging previous simulation-only beliefs.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid Mechanics

Background:

  • Dislocation dynamics in nanocrystalline materials are typically studied via computational simulations.
  • Direct observation of these processes at the nanoscale has been a significant challenge.

Purpose of the Study:

  • To experimentally observe and characterize dislocation processes during the deformation of nanocrystalline nickel.
  • To investigate the behavior of dislocations in grains as small as 10 nm.

Main Methods:

  • In situ tensile straining experiments.
  • High-resolution transmission electron microscopy (HRTEM).

Main Results:

  • Direct visualization of dislocation processes in nanocrystalline Ni with grain sizes down to 10 nm.

Related Experiment Videos

  • Observation of trapped unit lattice dislocations in strained grains as small as 5 nm.
  • Demonstration of dislocation recombination during subsequent relaxation processes.

    • Conclusions:

    • Experimental observation of dislocation dynamics in nanocrystalline materials is feasible.
    • Nanoscale grains (down to 5 nm) can exhibit trapped dislocations, with recombination upon relaxation.