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The Role of Surfaces in Superplasticity

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Surfaces and Interfaces II

Part of the book series: Sagamore Army Materials Research Conference Proceedings ((SAMC,volume 14))

Abstract

The rate of neck growth in superplastic materials depends directly on surface irregularities and inversely on the strain rate sensitivity, m = (d lnσ/d lnε). High values of m reflect a substantial contribution of diffusional creep, which is inversely related to a power function of the grain size. The characteristic maxima in the m versus log ε curves is explained by the extension of the diffusional creep model to include a back stress, σo, which increases with impurity and inclusion content, and is greater in the rolling than in the transverse direction.

The Coble model of grain boundary diffusional creep is shown to be appropriate for the viscous component in lead-tin.

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References

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Author information

Authors and Affiliations

  1. Brown University, Providence, Rhode Island, USA

    D. H. Avery & J. M. Stuart

  2. Illinois Institute of Technology, USA

    J. M. Stuart

Authors
  1. D. H. Avery
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  2. J. M. Stuart
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Editor information

Editors and Affiliations

  1. Army Materials and Mechanics Research Center, USA

    John J. Burke (Staff Scientist) & Norman L. Reed (Associate Director) (Staff Scientist) &  (Associate Director)

  2. Syracuse University, USA

    Volker Weiss (Professor) (Professor)

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© 1968 Syracuse University Press Syracuse, New York

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Avery, D.H., Stuart, J.M. (1968). The Role of Surfaces in Superplasticity. In: Burke, J.J., Reed, N.L., Weiss, V. (eds) Surfaces and Interfaces II. Sagamore Army Materials Research Conference Proceedings, vol 14. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-0178-4_12

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  • DOI: https://doi.org/10.1007/978-1-4757-0178-4_12

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4757-0180-7

  • Online ISBN: 978-1-4757-0178-4

  • eBook Packages: Springer Book Archive

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