Characterization of the interfacial properties of compound-extruded lightweight profiles using the push-out-technique

The use of aluminium in lightweight profiles for vehicle spaceframes is state of the art due to the material's low density combined with good specific mechanical properties. Nevertheless, the absolute stiffness and strength of aluminium is rather low in comparison to steels. A possibility to increase both stiffness and strength of aluminium-based structures is the use of compound-extruded profiles in which high-strength metallic reinforcements are incorporated. Within the scope of the present investigations, compound-extruded profiles with wire-reinforcements made of stainless spring steel 1.4310 (X10CrNi18-8), nickel-base superalloy Inconel 718 or cobalt-base alloy Haynes 25 in an AA6060 aluminium matrix were characterized in terms of the debonding shear strength using the push-out-technique. In addition to varying the reinforcement materials, the investigations focussed on the influence of different chemical and mechanical pre-treatments.