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The variation in flow stress and microstructure during superplastic deformation of the Al-Cu eutectic

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Abstract

Stress-strain curves have been obtained for the superplastically deformed Al-Cu eutectic tested in tension under constant true strain-rate conditions. It is shown that constant flow stress conditions do not obtain and that, after an initial transient, the flow stress is linearly related to natural tensile strain. Optical metallography has been employed to follow the variation of both inter-phase particle separation and α-Al grain size with strain and it is concluded that the observed strain hardening is due mainly to grain coarsening.

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Author notes

  1. D. M. Cottingham

    Present address: The Weldless Steel Tube Co Ltd, Wednesfield, Staffs, UK

Authors and Affiliations

  1. Tube Investments Research Laboratories, Hinxton Hall, Saffron Walden, Essex, UK

    B. M. Watts & M. J. Stowell

Authors
  1. B. M. Watts
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  2. M. J. Stowell
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  3. D. M. Cottingham
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Watts, B.M., Stowell, M.J. & Cottingham, D.M. The variation in flow stress and microstructure during superplastic deformation of the Al-Cu eutectic. J Mater Sci 6, 228–237 (1971). https://doi.org/10.1007/BF00550018

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  • DOI: https://doi.org/10.1007/BF00550018

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