About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Advanced Materials for Harsh Environments
|
Presentation Title |
Determining the Effect of Aerospace Environments on the Corrosion Fatigue Performance of AA7085-T7451 |
Author(s) |
Brandon T. Free, Sarah Galyon Dorman, Jason Niebuhr, Nathan Houser, Jenifer Locke |
On-Site Speaker (Planned) |
Brandon T. Free |
Abstract Scope |
AA7085-T7451 is an aerospace grade aluminum alloy that can be susceptible to corrosion fatigue (CF) when exposed to cyclic loading in atmospheric environments that are often made up of surface electrolyte droplets formed from deliquesced salts. Changes in humidity and temperature may lead to changes in CF performance that may not be adequately predicted by traditional experiments conducted in full immersion. The goal of this work is to quantify the effect of complex aerospace environments on the CF crack growth rates (da/dN) in AA7085-T7451. Testing to date has shown that samples loaded with 300 μg/cm2 of NaCl and exposed to 80% RH show a similar da/dN to samples that were fully immersed in 0.06 M NaCl. Further testing has shown that salt loads as low as 50 μg/cm2 exhibit da/dN close to that of full immersion when tested in 80% RH. Effects of wet/dry cycling and temperature are under investigation. |