Abstract
Two types of nanoclusters, i.e., Cluster (1) and Cluster (2), are detected in both Cu-free and Cu-added alloys. The Cu addition to the Al-Mg-Si alloys highly suppresses the formation of Cluster (1) at the initial stage of natural aging and causes higher peak hardness. The over-aging is suppressed in the Cu-added alloy, showing higher thermal stability.
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