Metallurgical and Materials Transactions A

, Volume 33, Issue 2, pp 363–371 | Cite as

A framework for modeling creep in pure metals

  • Holger Brehm
  • Glenn S. Daehn
Article

Abstract

The process of creep in pure metals is modeled as the cooperative interaction of three phenomena: the thermally activated, force-dependent release of dislocation segments from obstacles; the substructural refinement of the microstructure due to plastic deformation; and the diffusion-controlled coarsening of the substructure. Key parameters are given as approximate generic values which can be varied. It is shown that for a wide range of parameters, the model reproduces the key features of the creep of pure metals: a steady-state stress exponent near 5 is recovered, and the key microstructural-length scale is related by a power law close to the reciprocal of stress (this dependence is not a strong function of temperature at a given stress). In addition, the activation energy of steady-state creep is nearly that of self-diffusion. Thus, the model reproduces the well-known phenomenology of puremetal steady-state creep. However, the present model is based on separate microstructural phenomena, which can be independently refined and studied.

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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2002

Authors and Affiliations

  • Holger Brehm
    • 1
  • Glenn S. Daehn
    • 1
  1. 1.the Department of Materials Science and EngineeringThe Ohio State UniversityColumbus

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