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Contribution of grain boundary diffusion and capillarity forces to the diffusional creep of wires or fibers

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Abstract

Herring’s analysis of the Newtonian creep of wires with a bamboo grain structure is modified to include the effects of grain boundary diffusion and capillarity. The grain boundary contribution depends on the ratio σD b/2DR v whereR is the wire radius,D b andD v are the boundary and volume diffusion coefficients, and σ is the width of the grain boundary. Capillarity is introduced in a consistent fashion into the analysis and the classical result for equilibrium between the applied load and capillarity forces is found. The creep rate of single crystal fibers embedded in a plastically deformed matrix is considered for some simple geometries.

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Authors and Affiliations

  1. Engineering Laboratories, Cambridge University, Cambridge, England

    D. S. Wilkinson (Graduate Student)

  2. Department of Metallurgy and Materials Science, University of Toronto, Toronto, Canada

    G. C. Weatherly (Associate Professor)

Authors
  1. D. S. Wilkinson
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  2. G. C. Weatherly
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Wilkinson, D.S., Weatherly, G.C. Contribution of grain boundary diffusion and capillarity forces to the diffusional creep of wires or fibers. Metall Trans A 6, 265 (1975). https://doi.org/10.1007/BF02667280

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  • DOI: https://doi.org/10.1007/BF02667280

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