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The deformation behaviour of a dispersion strengthened superplastic zinc alloy

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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.

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Author notes

  1. J. D. Lee

    Present address: Bell Northern Research, Ottawa, Ontario, Canada

Authors and Affiliations

  1. Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, Canada

    J. D. Lee & P. Niessen

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  1. J. D. Lee
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  2. P. Niessen
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Lee, J.D., Niessen, P. The deformation behaviour of a dispersion strengthened superplastic zinc alloy. J Mater Sci 9, 1467–1477 (1974). https://doi.org/10.1007/BF00552932

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  • DOI: https://doi.org/10.1007/BF00552932

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