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Equal-channel angular pressing of commercial aluminum alloys: Grain refinement, thermal stability and tensile properties

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Abstract

Using equal-channel angular (ECA) pressing at room temperature, the grain sizes of six different commercial aluminum-based alloys (1100, 2024, 3004, 5083, 6061, and 7075) were reduced to within the submicrometer range. These grains were reasonably stable up to annealing temperatures of ∼200 °C and the submicrometer grains were retained in the 2024 and 7075 alloys to annealing temperatures of 300 °C. Tensile testing after ECA pressing through a single pass, equivalent to the introduction of a strain of ∼1, showed there is a significant increase in the values of the 0.2 pct proof stress and the ultimate tensile stress (UTS) for each alloy with a corresponding reduction in the elongations to failure. It is demonstrated that the magnitudes of these stresses scale with the square root of the Mg content in each alloy. Similar values for the proof stresses and the UTS were attained at the same equivalent strains in samples subjected to cold rolling, but the elongations to failure were higher after ECA pressing to equivalent strains >1 because of the introduction of a very small grain size. Detailed results for the 1100 and 3004 alloys show good agreement with the standard Hall-Petch relationship.

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Authors and Affiliations

  1. the Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, 812-8581, Fukuoka, Japan

    Zenji Horita (Associate Professor), Takayoshi Fujinami (Research Engineer) & Minoru Nemoto (Professor)

  2. the Departments of Materials Science and Mechanical Engineering, University of Southern California, 90089-1453, Los Angeles, CA

    Terence G. Langdon (Professor)

Authors
  1. Zenji Horita
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  2. Takayoshi Fujinami
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  3. Minoru Nemoto
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  4. Terence G. Langdon
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Horita, Z., Fujinami, T., Nemoto, M. et al. Equal-channel angular pressing of commercial aluminum alloys: Grain refinement, thermal stability and tensile properties. Metall Mater Trans A 31, 691–701 (2000). https://doi.org/10.1007/s11661-000-0011-8

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  • DOI: https://doi.org/10.1007/s11661-000-0011-8

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