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Journal of Materials Science

, Volume 46, Issue 24, pp 7713–7724 | Cite as

On the intrinsic ductility of electrodeposited nanocrystalline metals

  • I. Brooks
  • G. Palumbo
  • G. D. Hibbard
  • Zhirui Wang
  • U. Erb
Article

Abstract

While nanocrystalline materials hold promise for structural applications in which increased strength is beneficial, their adoption has been hindered by concerns over the achievable ductility, resulting largely from considerable data scatter in the literature. A statistically significant set of 147 electrodeposited nanocrystalline tensile specimens was used to investigate this topic, and it was found that while necking elongation obeys similar processing quality and geometrical dependencies as conventional engineering metals, the intrinsic ductility as measured by uniform plastic strain was unexpectedly independent of microstructure over the grain size range of 10–80 nm. This indicates that the underlying physical processes of grain boundary-mediated damage formation are strain-oriented phenomena that can be defined by a critical plastic strain regardless of the strength of the material as a whole.

Keywords

Nanocrystalline Material Plastic Instability Plane Strain Deformation Weibull Plot Diffuse Necking 

Notes

Acknowledgement

The authors gratefully acknowledge the generous support of the Natural Sciences and Engineering Research Council of Canada, Industry Canada (Technology Partnerships Canada program), National Research Council (Industrial Research Assistance Program), Ontario Research Fund, and the U.S. Department of Defense Strategic Environmental Research and Development Program project PP-1152.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • I. Brooks
    • 1
    • 2
  • G. Palumbo
    • 2
  • G. D. Hibbard
    • 1
  • Zhirui Wang
    • 1
  • U. Erb
    • 1
  1. 1.Department of Materials Science and EngineeringUniversity of TorontoTorontoCanada
  2. 2.Integran Technologies Inc.MississaugaCanada

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