Influence of Low Cu Addition on Quench Sensitivity in Al-Mg-Si Alloys

Takeshi Saito; Calin D. Marioara; Jostein Røyset; Randi Holmestad

doi:10.4028/www.scientific.net/AMR.922.616

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 922Influence of Low Cu Addition on Quench Sensitivity...

Influence of Low Cu Addition on Quench Sensitivity in Al-Mg-Si Alloys

Abstract:

Quench sensitivity in two Al-Mg-Si alloys, one Cu-free and the other with low Cu additions (~0.1 wt%), both having the same amounts of other solutes, has been investigated using transmission electron microscopy (TEM) and corresponding material hardness. A two stage hardness evolution during an isothermal heat treatment was observed with slow cooling after solution heat treatment. This effect was less pronounced in the Cu-added alloy. However maximum hardness was not influenced by cooling rate, which could be related to higher precipitate number densities and volume fractions. Both alloys were over-aged faster in the slow cooling conditions.

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Periodical:

Advanced Materials Research (Volume 922)

Pages:

616-621

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.922.616

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Online since:

May 2014

Authors:

Takeshi Saito*, Calin D. Marioara, Jostein Røyset, Randi Holmestad

Keywords:

Al-Mg-Si Alloy, Precipitation, Quench Sensitivity, Trace Elements, Transmission Electron Microscopy (TEM)

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