Abstract: The effects of 0.3%Zr+0.2%Er and 0.3%Zr+0.2%Y (mass fraction) on the microstructure and mechanical properties of Al-0.6Mg-0.9Si-0.5Cu-0.5Mn-0.2Cr (mass fraction) alloy before and after heat treatment were investigated based on optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDS), transmission electron microscopy (TEM) and tensile test. The results showed that both Zr+Er and Zr+Y could refine the α-Al grains, and the latter was more prominent and effective. Furthermore, both of them could improve the strength and ductility of the as-cast Al-0.6Mg-0.9Si-0.5Cu-0.5Mn-0.2Cr alloy. With heat treatment, both Zr+Er and Zr+Y had a negative influence on the precipitation of dispersed phase in the alloy and resulted in a decrease in dispersion strengthening. Finally, Zr+Er modified alloy had higher strength than matrix alloy, while Zr+Y modified alloy had lower strength, and both of them had lower elongation than matrix alloy.
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2017, Vol. 31 
