Abstract
Effects of actual marine atmospheric precorrosion and prefatigue on the fatigue property of 7085-T7452 aluminum alloy were investigated by using the methods of marine atmospheric outdoor exposure tests and constant amplitude axial fatigue tests. Marine atmospheric corrosion morphologies, fatigue life, and fatigue fractography were analyzed. After three months of outdoor exposure, both pitting corrosion and intergranular corrosion (IGC) occurred, while the latter was the dominant marine atmospheric corrosion mode. Marine atmospheric precorrosion could result in a dramatical decrease in the fatigue life of the as-received 7085-T7452 aluminum alloy, while selective prefatigue can improve the total fatigue life of the precorroded specimen. The mechanism of the actual marine atmospheric corrosion and its effects on the fatigue life of the 7085-T7452 aluminum alloy were also discussed.
Highlights
7085 aluminum alloy has received great attention in aerospace and automotive industries because of its outstanding properties such as low density, high specific strength, low quenching sensitivity, and good thermal stability [1,2,3,4,5,6,7,8,9]
7085 aluminum alloy has been used as structural parts in aircrafts, which are usually subjected to fatigue loading damage [10,11]
Burns et al [12] investigated the role of the plate thickness on the fatigue crack growth behavior of 7085 aluminum alloy and found that the increased crack path roughness, tortuosity, and branching in the thicker plate might result from the strain localization/cracking along precipitate-free zones
Summary
7085 aluminum alloy has received great attention in aerospace and automotive industries because of its outstanding properties such as low density, high specific strength, low quenching sensitivity, and good thermal stability [1,2,3,4,5,6,7,8,9]. 7085 aluminum alloy has been used as structural parts in aircrafts, which are usually subjected to fatigue loading damage [10,11]. A comprehensive understanding of the fatigue property of 7085 aluminum alloy is necessary. Several studies have been performed to elucidate the fatigue behavior of 7085 aluminum alloy [12,13,14,15,16]. Burns et al [12] investigated the role of the plate thickness on the fatigue crack growth behavior of 7085 aluminum alloy and found that the increased crack path roughness, tortuosity, and branching in the thicker plate might result from the strain localization/cracking along precipitate-free zones. Dai et al [14]
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