Abstract
AbstractWe have studied the fatigue lives of single crystals of copper in 0.1 M HClO4under different polarization potentials. Perchloric acid was chosen for the aqueous environment because it allows us to control the corrosion reactions rigorously. Persistent slip band (PSB) behaviour and crack nucleation were studied during life, and fracture surfaces after failure.Different behavior was observed depending on strain amplitude. At 2 × 10‐3 plastic shear strain amplitude, anodic potential was observed to decrease life, whereas cathodic potenlial was found to be less damaging than laboratory air. Crack nucleation and propagation occurred along the primary slip plane for both conditions. The reduction of fatigue life under anodic potential is explained by enhanced localized strain at the PSB's and preferential dissolution within them.However, for a strain amplitude of 4 × 10‐3, cracks nucleated and propagated along the secondary slip system. We observed crack nucleation to be associated with deformation‐induced stress concentrations, and the aqueous solution showed no aggressive effect under either anodic or cathodic potential.
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