Abstract
The effect of small additions of erbium and zirconium on the microstructure, phase composition, kinetics of hardening during aging and softening during annealing after rolling of the Al–5Si–1.3Cu–0.5Mg alloy has been studied in this work. Erbium and zirconium form a phase of crystallization origin with aluminum, silicon, copper, and magnesium, which does not dissolve and does not change its morphology in the process of homogenization before quenching. Erbium and zirconium increase the aging effect after quenching, especially at 210°C, increase the yield stress at elevated temperatures, reduce the tendency to soften during annealing after rolling, and reduce the recrystallized grain size due to dispersoids formed during homogenization. Quenching of deformed sheets with subsequent aging leads to the achievement of slightly lower yield strength than low temperature annealing after rolling. In this case, a significantly higher ultimate strength of 344–375 MPa and ductility of 11.0–14.7% are achieved. The alloy with small additions of zirconium and erbium has higher characteristics of both strength and plasticity.
Published Version
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