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Journal of Materials Science

, Volume 9, Issue 9, pp 1467–1477 | Cite as

The deformation behaviour of a dispersion strengthened superplastic zinc alloy

  • J. D. Lee
  • P. Niessen
Papers

Abstract

The deformation behaviour of a new dispersion strengthened superplastic zinc alloy was investigated. A significant long range internal stress was observed at all strain-rates. The activation volume of deformation decreased very rapidly with a decrease in the true effective stress. The maximum strain-rate sensitivity corresponds to a region of change from this high stress dependence of the activation volume to a much lower stress dependence. The observation of a metallographic halo effect shows that apart from dislocation movement, diffusive creep plays a role during superplastic deformation. It is stipulated that both these processes aid boundary sliding which accounts for the largest part of the strain.

Keywords

Polymer Zinc Long Range High Stress Effective Stress 
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Copyright information

© Chapman and Hall Ltd 1974

Authors and Affiliations

  • J. D. Lee
    • 1
  • P. Niessen
    • 1
  1. 1.Department of Mechanical EngineeringUniversity of WaterlooWaterlooCanada

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