Fracture toughness and tensile behavior of multi-layer laminated metal composite of Al 6090-25 vol % SiCp and Al 5182

摘要

Multilayer laminates of varying volume percentage (from 50-50 to 3-97) of Al 5182 and Al 6090 metal matrix composite containing 25 vol % SiC particulate were made by a press bonding method. The yield and tensile strengths of these laminated metal composites were slightly lower than the rule-of-averages values of the component materials. As the volume fraction of the ductile component decreased from 50% to about 3%, the yield and tensile strengths increased from those of the 50-50 laminates, and the fracture toughness also showed a slightly increasing tendency. The ductility of the laminate was insensitive to the change in volume fraction of the ductile component. Fractography on tensile and fracture toughness tested samples showed that crack propagation in the laminates was blunted by delamination ahead of the growing crack and by plastic deformation in the ductile component.