Influence of low Cu addition on quench sensitivity in Al-Mg-Si alloys
Journal article
Submitted version
Date
2014Metadata
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Original version
Advanced Materials Research. 2014, 922 616-621. 10.4028/www.scientific.net/AMR.922.616Abstract
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