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Clustering and Vacancy Behavior in High- and Low-Solute Al-Mg-Si Alloys

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Abstract

The precipitate microstructure and vacancy distribution in Al-Mg-Si alloys with different amounts of solute and different heat treatments were investigated by transmission electron microscopy and muon spin relaxation measurements. A high amount of vacancies is normally present in Al-Mg-Si alloys as these bind to atomic clusters. We observe these vacancies to leave the material not before over-aging at very high temperatures such as 623 K (350 °C), meaning that vacancies do not bind to incoherent over-aged precipitates. For samples only stored at room temperature after solution heat treatment, a reduction of muon trapping was found at a temperature of 140 K (−133 °C) when reducing the amount of solute in the alloy. This might be connected to a lower number density of Cluster (1), which contrary to Cluster (2) do not nucleate precipitates upon further aging of the material.

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Acknowledgments

This work was financially supported by The Research Council of Norway and Norsk Hydro via project no. 193619, The Norwegian–Japanese Al-Mg-Si Alloy Precipitation Project.

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Authors and Affiliations

  1. Department of Physics, NTNU, Høgskoleringen 5, 7491, Trondheim, Norway

    Sigurd Wenner (Postdoctoral researcher) & Randi Holmestad (Professor)

  2. Department of Materials Science and Engineering, University of Toyama, Gofuku 3190, Toyama-Shi, Toyama, 930-8555, Japan

    Katsuhiko Nishimura (Professor) & Kenji Matsuda (Professor)

  3. Advanced Meson Science Laboratory, RIKEN Nishina Center for Accelerator Based Science, RIKEN, Wako, Saitama, 351-0198, Japan

    Teiichiro Matsuzaki (Researcher) & Dai Tomono (Researcher)

  4. ISIS Facility, Rutherford Appleton Laboratory, Chilton, OX11 0QX, UK

    Francis L. Pratt (Instrument Scientist)

  5. Materials and Chemistry, SINTEF, Høgskoleringen 5, 7491, Trondheim, Norway

    Calin D. Marioara (Senior Scientist)

Authors
  1. Sigurd Wenner
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  2. Katsuhiko Nishimura
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  3. Kenji Matsuda
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  4. Teiichiro Matsuzaki
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  5. Dai Tomono
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  6. Francis L. Pratt
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  7. Calin D. Marioara
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  8. Randi Holmestad
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Corresponding author

Correspondence to Sigurd Wenner.

Additional information

Manuscript submitted April 4, 2014.

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Wenner, S., Nishimura, K., Matsuda, K. et al. Clustering and Vacancy Behavior in High- and Low-Solute Al-Mg-Si Alloys. Metall Mater Trans A 45, 5777–5781 (2014). https://doi.org/10.1007/s11661-014-2527-3

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  • DOI: https://doi.org/10.1007/s11661-014-2527-3

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