Numerical and experimental investigations of the production processes of coextruded aluminium/magnesium-compounds and the strength of the interface

In the research project SFB 692 the aim of the subproject B3 is to analyze aluminium/magnesium-compounds, especially the strength and fracture mechanical properties. Furthermore a numerical model of the interface should be created. In the following paper the main results of the investigations of the subproject are presented. Different influencing variables were analyzed, which determine the quality of the interface. It has been shown, that the compound quality and also the strength of the interface is based on several parameters of hydrostatic and indirect extrusion processes. If the quality of the interface is good, without cracks, the strength is very high. Furthermore the behaviour of the interface under loading in an extended temperature range is presented. A numerical model was found to visualize the behaviour of the compound during the loading tests.