Abstract
The effects of zinc and copper on the precipitation and redissolution processes in AlZnMgCu alloys were investigated by differential scanning calorimetry. The study was carried out on an Al-5wt.%Zn-2.3wt.%Mg alloy to which 2 wt.% of either zinc or copper was added. It was found that both zinc and copper promote nucleation of Guinier-Preston zones, the upper temperature limit for zone formation being higher in the alloys containing copper. However, the kinetics of phase redissolution in both naturally and artificially aged material, were largely independent of zinc and copper contents. Additions of zinc and of copper increased the quench sensitivity to a similar extent.
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