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

Wenner, Sigurd; Nishimura, Katsuhiko; Matsuda, Kenji; Matsuzaki, Teiichiro; Tomono, Dai; Pratt, Francis L.; Marioara, Calin Daniel; Holmestad, Randi
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https://hdl.handle.net/11250/2719563
Date
2014
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Original version
Metallurgical and Materials Transactions. A. 2014, 45 5777-5781.   10.1007/s11661-014-2527-3
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.
Publisher
Springer
Journal
Metallurgical and Materials Transactions. A
Copyright
This is a pre-print of an article published in Metallurgical and Materials Transactions A. The final authenticated version is available online at: https://link.springer.com/article/10.1007%2Fs11661-014-2527-3