Evaluation of Residual Stress Development at the Interface of Plasma Electrolytically Oxidized and Cold-Worked Aluminum
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Fatigue failure in hard oxide-coated aluminum is usually driven by rapid short crack propagation from the interface through the substrate; mitigation of this is possible by introducing interfacial compressive stresses. Combining cold work with hard oxide coating can improve their performance under conditions of simultaneous wear, corrosion, and fatigue. Three-dimensional strain fields in an aluminum alloy with combined cold work and PEO coating have been measured and mechanisms for stress redistribution presented. These comprise material consumption, expansive growth of oxide layers, and local annealing.
KeywordsResidual Stress Compressive Residual Stress Shot Peening Plasma Electrolytic Oxidation Plasma Electrolytic Oxidation Coating
David Asquith and Aleksey Yerokhin acknowledge ESRF funding of experiment MA-243 (local contact Dr Alex Evans) and EPSRC grant number EP/H051317/1, respectively.
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