Influence of the Mg/Si Ratio on Speed Extrusion of 6XXX Alloys

Development of the building and construction and automotive industries sets the task to increase the productivity of equipment and reduce the cost of aluminium extrusion. The absolute majority among all aluminium wrought alloys for extrusion belongs to Al- Mg-Si alloys (6XXX series). The small additions of Magnesium and Silicon allow precipitation of metastable phases with Mg/Si ratio close to 1 during aging, resulting in 5 times higher strength in comparison with pure aluminium. The paper shows the evaluation of the effect of MagnesiumSilicon ratio on the extrusion speed of the developed high-speed 6XXX alloys named as MaxiFlow family. Specially developed composition and homogenization parameters of these alloys ensure the increase of extrusion speed up to 10-30% compared to the standard alloys. The study of the influence of the content of alloying and impurity elements and modes of homogenization on the phase composition of 6XXX billets is presented as well as the anodizing response.