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Grain size effects in the strain hardening of polycrystals

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Abstract

The degree to which the flow stress of a polycrystal is sensitive to grain size is discussed in terms of the distribution of slip and dislocation structure that develops in the vicinity of grain boundaries as deformation proceeds. The point of view is taken that the two principal classes of grain boundary hardening models, namely, those based on dislocation pile-ups and those based on dislocation density concepts respectively represent special cases of a single rationale developed in this paper. Grain boundary strengthening is intimately related to strain hardening which is affected by slip mode,i.e., the number of slip systems and the ability to cross slip. The effects of substitutional solute elements on grain boundary strengthenings is considered to be a consequence of their influence on slip modes rather than on their interaction with dislocation sources.

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Authors and Affiliations

  1. Ford Motor Company, Dearborn, Mich

    T. L. Johnston & C. E. Feltner

Authors
  1. T. L. Johnston
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  2. C. E. Feltner
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Additional information

This manuscript is based on an invited talk presented at the symposium on Deformation and Strength of Polycrystals, sponsored by the IMD Physical Metallurgy Committee, Detroit, Mich., October 14–15, 1968.

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Johnston, T.L., Feltner, C.E. Grain size effects in the strain hardening of polycrystals. Metall Trans 1, 1161–1167 (1970). https://doi.org/10.1007/BF02900226

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