Dynamic impact response of nanostructured and hybrid aluminum alloys

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Aluminum alloys are choice materials for application in aerospace structures and as protective armor in military combat vehicles due to their low density and high specific strength. They offer unique advantages of weight reduction leading to fuel efficiency in aircraft and easy maneuverability in combat vehicles. In these applications, Al alloys must have good failure resistance to impact load, whether from bird strike for aircraft or projectiles in combat vehicles. When exposed to dynamic shock loading, intense strain localization culminating in development of adiabatic shear bands (ASBs) occurs in metallic alloys. This often triggers catastrophic failure. The ability of an alloy to withstand impact failure is determined by its resistance to formation of ASBs. Several high strength aluminum alloys fail catastrophically under dynamic impact loading due to their high susceptibility to formation of ASBs. With increasing incidences of bird strikes due to quieter engines in modern aircraft, and the need for improved lightweight protective armor, development of aluminum alloys with enhanced resistance to impact damage is inevitable.