Effect of microalloying element addition on the microstructure, mechanical and corrosion behaviour of A356 secondary alloy with 0.30wt Fe

摘要

This work investigated how trace additions of Mn, Cr and V affect the morphologies of harmful β-AlFe5Si intermetallics, mechanical properties and corrosion behavior of A3 56 secondary alloy with an iron content of 0.30wt%. The needle shaped β-intermetallics are replaced by a Chinese script α-. compound when Mn, Cr and V are added. The mechanical properties of A356 secondary alloys were improved by the modification of the β-intermetallics into α-iron compounds. The corrosion behavior of the modified secondary alloy was similar to both, the A356 primary and the unmodified secondary alloys. Thus, small additions of Mn, Cr and V improve the mechanical properties without negatively affecting the corrosion resistance of A3 56 secondary alloy.