Caliber Rolling Process and Mechanical Properties of High Fe-Containing Al-Mg-Si Alloys

Fe-intermetallic compounds are commonly detrimental for mechanical properties and formability of aluminum alloys. In this study, the refinement of Fe-intermetallic compounds and mechanical properties in high Fe-containing Al-Mg-Si alloys were studied by caliber rolling. The Al-(2.2-2.3) mass%Si-0.9 mass%Mg-(1, 1.5 and 2) mass%Fe alloys were severely deformed by the multi-pass caliber rolling at 573 and 723 K. Fe-intermetallic compounds were finely fragmented with the smallest size of around 200 nm. The morphologies of fragmented Fe compounds in the Al matrix depend on the as-cast microstructure and deformation behavior with better distribution in the outer area than in the center area. Good ultimate strength of 345-360 MPa and high elongation of 15-25% were achieved after 95% caliber rolling. [doi:10.2320/matertrans.MBW201121]