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Two types of nanoclusters, Cluster (1) and Cluster (2), play an important role in the age-hardening behavior in Al­Mg­Si alloys. Both Cluster (1) formed during natural aging at room temperature and Cluster (2) formed during pre-aging at 100°C cause the higher hardness and higher number density of the ¢′′ phase during the two-step aging at 250°C than those of the single-aged specimen. Both of Cluster (1) and Cluster (2) result in the positive effect of two-step aging even though the mechanism is different. The positive effect of two-step aging for the naturally-aged specimen is caused by the atomic rearrangement from Cluster (1) to the Pre-¢′′ phase at the early stage of aging at 250°C. On the other hand, Cluster (2) is stable up to 250°C and directly transforms into the ¢′′ phase. The thermal stability of nanoclusters and their transition behavior are discussed based on the age-hardening phenomena. [doi:10.2320/matertrans.M2013411]

Thermal Stability and Transition Behavior of Nanoclusters during Two-Step Aging at 250&deg;C in Al&ndash;Mg&ndash;Si(&ndash;Cu) Alloys

Thermal Stability and Transition Behavior of Nanoclusters during Two-Step Aging at 250°C in Al–Mg–Si(–Cu) Alloys