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Precipitate effects on the mechanical behavior of aluminum copper alloys: Part I. Experiments

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Abstract

This article focuses on understanding the mechanical behavior of precipitation-hardened alloys by studying single and polycrystalline deformation behavior with various heat treatments. Aluminumcopper alloys are the focus in this work and their changing stress-strain behavior is demonstrated resulting from the different hardening mechanisms brought about by the various precipitates. Extensive transmission electron microscopy investigations facilitated the interpretation of the stress-strain behavior and the work hardening characteristics. The use of both single and polycrystals proved valuable in understanding the role of anisotropy due to crystal orientation vs precipitate-induced anisotropy. The experiments show that precipitation-induced anisotropy could offset the crystal orientation anisotropy depending on the orientation. This is clearly demonstrated with similar [111] and [123] behaviors under 190 °C and 260 °C aging temperatures. Experiments on pure aluminum crystals are also provided for comparison and understanding the crystal anisotropy in the absence of precipitates. Part I of this article will focus on experiments, and part II will describe the modeling of the effect of different metastable phases in the matrix acting as barriers to dislocation motion.

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Authors and Affiliations

  1. Department of Mechanical and Industrial Engineering, University of Illinois, 61801, Urbana, IL

    H. Sehitoglu (C.J. Ganthier Professor and Interim Head)

  2. Exxon Mobile Upstream Research Company, 77046, Houston, TX

    T. Foglesong (Research Engineer)

  3. Department of Materials Science, University of Paderborn, D-33905, Paderborn, Gemany

    H. J. Maier (Professor)

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  1. H. Sehitoglu
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  2. T. Foglesong
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  3. H. J. Maier
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FOGLESONG for-merly with the Department of Mechanical and Industrial Engineering, University of Illinois, Urbana, IL 61801

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Sehitoglu, H., Foglesong, T. & Maier, H.J. Precipitate effects on the mechanical behavior of aluminum copper alloys: Part I. Experiments. Metall Mater Trans A 36, 749–761 (2005). https://doi.org/10.1007/s11661-005-1006-2

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  • DOI: https://doi.org/10.1007/s11661-005-1006-2

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