Abstract
The decomposition kinetics of the aluminum-based supersaturated solid solution in Al-Mg2Si alloys with some transition metal additions is studied by hardness and electrical resistivity measurements, optical microscopy, and scanning electron microscopy. The effect of only scandium or scandium along with zirconium and hafnium on the hardening of the Al-Mg-Si alloys after heat treatment, which includes quenching, natural aging, and artificial aging, is revealed. The artificial aging temperature at which the hardening is maximal is chosen.
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