Abstract
A possibility to increase both stiffness and strength of aluminium-based structures for the application in lightweight profiles for vehicle space frames is the use of composite extrusions in which high-strength metallic reinforcements are incorporated. Within the scope of the present investigations, composite-extruded profiles with wire-reinforcements made of austenitic spring steel 1.4310 (X10CrNi18-8), in an aluminium matrix AA6060 (AlMgSi0.5), which were exposed to different corrosive media for different times, were characterised in terms of the debonding shear strength using the push-out-technique. The formation of a galvanic couple could be conceived mathematically in regard of terms describing the formation of a shear-impeding layer and the corrosive attack. Thereby the parameters for the different media could be determined.
Highlights
Aluminium and its alloys are highly qualified candidate materials for lightweight automotive constructions due to their low density in addition to the outstanding formability
Within the scope of the present investigations, composite-extruded profiles with wire-reinforcements made of austenitic spring steel 1.4310 (X10CrNi18-8), in an aluminium matrix AA6060 (AlMgSi0.5), which were exposed to different corrosive media for different times, were characterised in terms of the debonding shear strength using the push-out-technique
Due to the formation of a galvanic couple, the interface between the composite components which is responsible for the internal load transfer between matrix and reinforcing component and important for the mechanical capability of the composite material is susceptible to enhanced corrosive attack
Summary
Aluminium and its alloys are highly qualified candidate materials for lightweight automotive constructions due to their low density in addition to the outstanding formability. The bar extrusion technology represents a promising alternative to conventional casting techniques and is a solid state manufacturing route for composites. Due to the formation of a galvanic couple, the interface between the composite components which is responsible for the internal load transfer between matrix and reinforcing component and important for the mechanical capability of the composite material is susceptible to enhanced corrosive attack. In addition to the qualitative evaluation of the interface and the damage due to the corrosive load by means of classical metallographic analysis, the push-out test, first proposed by Marshall [2], offers a possibility to measure quantitatively the shear strength of the composite interface and its change as a function of time.
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