A new secondary AlSi10MnMg (Fe) Alloy suitable for manufacturing of ductile Aluminium parts by vacuum assisted high pressure die casting technology

摘要

Vacuum assisted high pressure die castings (VPDC) with high ductility requirements are usually manufactured with primaryAlSi10MnMg alloy. However, secondary alloys could be an interesting alternative as they offer several advantages such as cheaper raw material and longer die life. But, the higher amount of Fe, reduces the ductility due to the formation of needle/platelet shaped beta-Al5FeSi compounds. These compounds can be transformed into a-iron compounds with less harmful by microadditions of Mn. In this work a secondary type alloy with moderate iron content, 0.47-0.60 % Fe, and optimised Mn addition, has been cast in step test parts with different wall thicknesses using VPDC technology. The microstructure has been investigated to assure that no harmful beta-Al5FeSi compounds are formed. Mechanical properties have been determined in different conditions: F (as-cast), T4, T5 and T6 temper. The results show that mechanical properties comparable to the corresponding primary alloy can be obtained. Finally, the high mechanical properties of the new alloy were validated in a real part.