Abstract
The aircraft industry is constantly looking for improved materials which would offer benefits in terms of performance, weight and cost savings. The aim of this work was to evaluate the fatigue life of two new Al alloys: AA2198-T851 and AA7081-T73511 that are promising substitute of the base alloys AA 2524 T3 and AA7050 T745. It was considered the effect of a saline environment on the fatigue crack nucleation life of preconditioned specimens. The fatigue tests were conducted under air and pre-soaked conditions, with R = 0.1, 30Hz frequency and sinusoidal wave shape. Comparing with the base alloy, the AA2198 T851 presented an increased tensile strength, while the AA7081-T73511 alloy presented slightly decreased tensile strength. The corrosion test has showed that all the Al alloys studied presented similar corrosion resistance at saline environment. From the fatigue test it was possible to see the deleterious effect of the saline environment on the fatigue life of all alloys studied with pits formation intensively on the specimens’ surface, acting as stress concentrators reducing the fatigue life. The fracture surface evaluation has shown that, after soaking, fatigue failure took place from many nucleation sites.
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