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Grain-boundary sliding controlled creep: its relevance to grain rolling and superplasticity

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Abstract

A model of a polycrystal is developed which describes creep controlled by the rate of sliding on grain boundaries. Normal boundary stresses are assumed to relax rapidly by a mechanism which transfers material between boundaries to accommodate the sliding displacements. A self-consistent treatment of the shear stresses on the boundaries and the shears between grain centres only arises when the grains are allowed to roll or rotate. The calculated rates of rotation agree with rates observed during Stage II superplastic creep. Many features of the model tie in with the geometrical behaviour of grains deforming superplastically.

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Authors and Affiliations

  1. Central Electricity Generating Board, Berkeley Nuclear Laboratories, Berkeley, Gloucestershire, UK

    W. Beere

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  1. W. Beere
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Beere, W. Grain-boundary sliding controlled creep: its relevance to grain rolling and superplasticity. J Mater Sci 12, 2093–2098 (1977). https://doi.org/10.1007/BF00561984

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  • DOI: https://doi.org/10.1007/BF00561984

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