Abstract
Aging behavior of Al-0.25Zr-0.03Y-0.10Si were investigated to evaluate the role of 0.10%Si usually contained in commercially pure Al. Compared with the Si-free ternary alloy (Al-Zr-Y), accelerated aging kinetics, enhanced hardening effect and higher conductivity were obtained. Aging precipitates with tripled number density were observed in alloy Al-0.25Zr-0.03Y-0.10Si, whereas size and coarsening resistance were not affected by Si content. Contribution of Si provides a large number of nuclei, rather than accelerating the diffusion of Zr. Formation of primary Al3Y during solidification resulted in a 50 °C drop in recrystallization temperature.
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