Grain Boundary-Mediated Plasticity in Nanocrystalline Nickel-Reference-Cited by-同舟云学术

Grain Boundary-Mediated Plasticity in Nanocrystalline Nickel

Published:2004-07-30 Issue:5684 Volume:305 Page:654-657
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Shan Zhiwei¹²³⁴,Stach E. A.¹²³⁴,Wiezorek J. M. K.¹²³⁴,Knapp J. A.¹²³⁴,Follstaedt D. M.¹²³⁴,Mao S. X.¹²³⁴

Affiliation:

1. Department of Mechanical Engineering, University of Pittsburgh, 648 Benedum Hall, Pittsburgh, PA 15261, USA.

2. National Center for Electron Microscopy (NCEM), Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA 94720, USA.

3. Department of Materials Science and Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA.

4. Physical and Chemical Science Center, Sandia National Laboratories (SNL), Albuquerque, NM 87185, USA.

Abstract

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 observations of nanocrystalline nickel films with an average grain size of about 10 nanometers, which show that grain boundary–mediated processes have become a prominent deformation mode. Additionally, trapped lattice dislocations are observed in individual grains following deformation. This change in the deformation mode arises from the grain size–dependent competition between the deformation controlled by nucleation and motion of dislocations and the deformation controlled by diffusion-assisted grain boundary processes.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference29 articles.

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