Abstract
The fatigue resistance of aerospace structures is degraded by the presence of corrosion damage. This work characterizes the micro-scale (<50 µm) corrosion morphologies and the underlying microstructure of AA7050 that impact fatigue crack formation. Corroded specimens were cycled to failure using a fracture surface marking spectrum. Pre-test corrosion characterization, fractography and EBSD were performed. No corrosion damage or microstructure metric independently correlates to the location of fatigue crack initiation from corroded surfaces. However, there is a modest correlation between the grain that initiates the fatigue crack and grains that have a high misorientation angle with respect to adjacent grains.
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