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Modeling high-temperature stress-strain behavior of cast aluminum alloys

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Abstract

A modified two-state-variable unified constitutive model is presented to model the high-temperature stress-strain behavior of a 319 cast aluminum alloy with a T7 heat treatment. A systematic method is outlined, with which one can determine the material parameters used in the experimentally based model. The microstructural processes affecting the material behavior were identified using transmission electron microscopy and were consequently correlated to the model parameters. The stress-strain behavior was found to be dominated by the decomposition of the metastable θ′ precipitates within the dendrites and the subsequent coarsening of the θ phase, which was manifested through remarkable softening with cycling and time. The model was found to accurately simulate experimental stress-strain behavior such as strain-rate sensitivity, cyclic softening, aging effects, transient material behavior, and stress relaxation, in addition to capturing the main deformation mechanisms and microstructural changes as a function of temperature and inelastic strain rate.

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Author notes

  1. Tracy J. Smith (Graduate Student), Huseyin Sehitoglu (Professor and Associate Head), Eric Fleury (Postdoctoral Research Fellow) & Hans J. Maier (Visiting Scientist)

    Present address: Universität-GH Siegen, 57068, Siegen, Germany

Authors and Affiliations

  1. the Department of Mechanical and Industrial Engineering, University of Illinois, at Urbana-Champaign, 61801, Urbana, IL

    Tracy J. Smith (Graduate Student), Huseyin Sehitoglu (Professor and Associate Head), Eric Fleury (Postdoctoral Research Fellow) & Hans J. Maier (Visiting Scientist)

  2. Ford Research Laboratory, 48121-2053, Dearborn, MI

    John Allison (Principal Research Scientist)

Authors
  1. Tracy J. Smith
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  2. Huseyin Sehitoglu
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  3. Eric Fleury
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  4. Hans J. Maier
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  5. John Allison
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on leave from Universität-GH Siegen, 57068 Siegen, Germany

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Smith, T.J., Sehitoglu, H., Fleury, E. et al. Modeling high-temperature stress-strain behavior of cast aluminum alloys. Metall Mater Trans A 30, 133–146 (1999). https://doi.org/10.1007/s11661-999-0201-y

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  • DOI: https://doi.org/10.1007/s11661-999-0201-y

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