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Licensed Unlicensed Requires Authentication Published by De Gruyter June 11, 2013

Effect of room temperature storage time on precipitation in Al–Mg–Si(–Cu) alloys with different Mg/Si ratios

Sigurd Wenner, Calin Daniel Marioara, Sigmund Jarle Andersen and Randi Holmestad


The effect of natural ageing time before artificial ageing has been investigated in four Al–Mg–Si(–Cu) alloys, with 0.4% Mg + 0.8% Si and 0.8% Mg + 0.4% Si, both with and without 0.14 at.% Cu. The precipitate microstructure was quantified by means of transmission electron microscopy. Varying the storage time before ageing for 170 min at 200°C, we observe an initial hardness increase after minutes, a decrease after several hours and another increase after weeks. The hardness decrease was most pronounced in the Mg-rich Cu-free alloy, caused by a reduced precipitate volume fraction. Adding Cu produces finer microstructures, higher hardness and reduces the negative effect of natural ageing regardless of the Mg/Si ratio of the alloy. With 1 week storage, an increase in the fraction of the Cu-containing precipitates L and Q′ was observed in the Cu-containing Si-rich and Mg-rich alloys respectively.

1 Correspondence address: Mr. Sigurd Wenner, Department of Physics, NTNU, Høgskoleringen 5, N-7491 Trondheim, Norway, Tel.: +47 73590730, Fax: +47 73597710, E-mail:


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Received: 2011-10-26
Accepted: 2012-4-20
Published Online: 2013-06-11
Published in Print: 2012-08-01

© 2012, Carl Hanser Verlag, Munich