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Study of artificial aging in AlMgSi (6061) and AlMgSiCu (6013) alloys by Positron Annihilation

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Abstract

We investigate the artificial aging process of the weldable Al-alloys AA-6013 (AlMgSiCu) and AA-6061 (AlMgSi) by positron annihilation spectroscopy and Vickers micro-hardness measurements. We find a correlation between a minimum of the measured positron lifetime and the maximum hardness. To explain these findings AlZn will be discussed as a well known example of positron interaction with different types of precipitations in aluminum. Additionally, we calculate positron annihilation parameters for pure Al, Si, Mg, and \(\mbox{Mg}_2\mbox{Si}\) finding support for our interpretation. For AA-6013 and AA-6061 the increase of the average positron lifetime after reaching the maximum hardness is attributed to the formation of semi-coherent precipitates. Hence, using positron annihilation it is possible to follow very sensitively the precipitation sequence even in technical aluminum alloys. Finally, we discuss which implications the aging may have on microstructural changes.

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Author notes

  1. T. E. M. Staab

    Present address: HISKP, Universität Bonn, Nußallee 14-16, D-53115, Bonn, Germany

  2. U. Hornauer

    Present address: Forschungszentrum Rossendorf, P.O. Box 51 01 19, D-01314, Dresden, Germany

  3. E. Zschech

    Present address: AMD Saxony LLC & Co. KG, Wilschdorfer Landstraße 101, D-01109, Dresden, Germany

Authors and Affiliations

  1. Department of Physics, Martin-Luther Universität Halle-Wittenberg, Friedemann-Bach-Platz 6, D-06108, Halle/Saale, Germany

    T. E. M. Staab & R. Krause-Rehberg

  2. Airbus Deutschland GmbH, Hünefeldstraße 1-5, D-28199, Bremen, Germany

    U. Hornauer & E. Zschech

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  1. T. E. M. Staab
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  2. R. Krause-Rehberg
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  3. U. Hornauer
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Staab, T.E.M., Krause-Rehberg, R., Hornauer, U. et al. Study of artificial aging in AlMgSi (6061) and AlMgSiCu (6013) alloys by Positron Annihilation. J Mater Sci 41, 1059–1066 (2006). https://doi.org/10.1007/s10853-005-3640-x

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  • DOI: https://doi.org/10.1007/s10853-005-3640-x

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