Aluminium is the lightweight material of the automotive industry. The applied e-mobility boom clearly shows this. Whether cast or wrought material is used, they all have one thing in common. The target is maximum strength and ductility with minimum use of alloying elements to generate the full light weight potential. It is of great interest to know how the strength-increasing alloying elements precipitate, coarsen or dissolve again during the process steps from casting, homogenisation, heating and in this case hot extrusion and quenching after the extrusion.

The casted billet material for hot extruded can be easily examined with the aid of light microscopy and scanning electron microscopy. The accessibility to samples from the continuous gas oven and connected induction oven was a big gap until now. Different heating scenarios of the gas oven and the induction oven were investigated on industrial and laboratory scale. In particular, the influence of different holding temperatures and soaking times were investigated with the help of low-temperature etching methods for SEM examination and image analysis by AI.

This allows a deep understanding of the precipitation-dissolution kinetics of the MgSi phases, which is currently still in contrast to general knowledge.