Quasi-Static and Shock Induced Mechanical Response of an Aluminium-Zinc-Magnesium Alloy as a Function of Heat Treatment

Samples of an aluminium‐zinc‐magnesium alloy, typical of high strength weldable aluminium alloys, have been heat treated to produce two different microstructural conditions, these being peak‐aged and under‐aged. Mechanical tests have been performed, both at quasi‐static strain rates and under shock loading conditions to determine how the mechanical properties change with heat treatment. Results indicate that the material has its highest strength when peak aged. Properties are discussed in relation to observed features within the microstructure, as recorded by optical and scanning electron microscopy.