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The activation areas for creep deformation

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Abstract

The activation areas for creep deformation are collected and examined in the light of many material and deformation variables. The activation area is A *= (kT/b) (∂ In \(\dot \in \)/∂τ*) T where k is Boltzmann's constant, T the absolute temperature, b the Burgers vector, \(\dot \in \) the steady state creep rate, and τ * the effective shear stress. It is found that within a factor of 5, there is a general correlation between activation area and stress for all metals, alloys, semiconductors and ionic crystals. A jog-limited dislocation motion with a distribution of jog spacings is suggested as a possible mechanism for this behaviour. Some limitations for the jog mechanism are discussed.

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Author notes

  1. N. Balasubramanian & J. C. M. Li

    Present address: Materials Research Centre, Allied Chemical Corporation, Morristown, New Jersey, USA

Authors and Affiliations

  1. Henry Krumb School of Mines, Columbia University, New York, USA

    N. Balasubramanian

  2. E. C. Bain Laboratory for Fundamental Research, US Steel Corporation, Monroeville, Pennsylvania, USA

    J. C. M. Li

Authors
  1. N. Balasubramanian
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  2. J. C. M. Li
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Balasubramanian, N., Li, J.C.M. The activation areas for creep deformation. J Mater Sci 5, 434–444 (1970). https://doi.org/10.1007/BF00550006

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