Abstract
Aluminum-Lithium based alloys are of considerable interest because of their low density and high modulus. However, they have been shown to be susceptible to stress corrosion cracking (SCC). This has been attributed to a variety of factors including: planar slip bands, segregation to grain boundaries and weakened grain boundaries due to precipitation and PFZ's. Information related to the SCC susceptibility of these alloys is limited compared to conventional Al alloys, and the mechanisms responsible for environment assisting cracking have not been fully explained. Previous studies on the SCC of Al-Li alloys suggest a number of mechanisms for the cracking behavior. One of them is the anodic dissolution of grain boundary precipitates. For the case of Al-Li alloys, several investigations indicate the important role of grain boundary precipitates in the SCC process. But there are few studies concerning effect of T[sub 2] phase on the SCC behavior of the alloys. This study reports a series of experiments which suggest effects of deformation and recrystallization on the precipitation behavior and SCC susceptibility of a 2091 Al-Li alloy.
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