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The influence of alloy composition on precipitates of the Al-Mg-Si system

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Abstract

To study how changes in solute elements affect precipitation, six Al-Mg-Si alloys aged at 175 °C were investigated by transmission electron microscopy (TEM). In alloys with 1.3 at. pct solute, when the Si/Mg ratio exceeds 5/6, a sharp hardness peak appears after 3 hours that correlates with a high density of fine Guinier-Preston (GP) zones. A second, broader peak correlates with β″ precipitates and U phases. With high Si/Mg ratios, GP zones survive for long aging times. The β″-Mg5Si6 phase becomes very stable in the alloy with its Si/Mg ratio closest to 6/5. Deviation from this ratio increases fractions of β′, U-phases and disordered precipitates. In Mg-rich alloys less GP zones form and the first peak is suppressed. A coarse precipitate microstructure of β″ and β′ develops, the volume fraction being much higher than in Si-rich alloys. The Mg-rich alloys overage faster. Reducing the content of solutes causes alloys with high Si/Mg ratios to have a more Mg-rich behavior.

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Authors and Affiliations

  1. SINTEF Materials and Chemistry, N-7465, Trondheim, Norway

    C. D. Marioara (Research Scientist) & S. J. Andersen (Senior Scientist)

  2. the National Centre for HREM, Laboratory of Materials Science, Delft University of Technology, 2628 AL, Delft, The Netherlands

    H. W. Zandbergen (Professor)

  3. the Department of Physics, Norwegian University of Science and Technology, N-7491, Trondheim, Norway

    R. Holmestad (Professor)

Authors
  1. C. D. Marioara
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  2. S. J. Andersen
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  3. H. W. Zandbergen
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  4. R. Holmestad
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Marioara, C.D., Andersen, S.J., Zandbergen, H.W. et al. The influence of alloy composition on precipitates of the Al-Mg-Si system. Metall Mater Trans A 36, 691–702 (2005). https://doi.org/10.1007/s11661-005-0185-1

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  • DOI: https://doi.org/10.1007/s11661-005-0185-1

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