, Volume 20, Issue 6, pp 989-996
Date: 13 Aug 2010

The Effects of Retrogression and Reaging on Aluminum Alloy 2099 (C458)

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The objective of this study was to investigate the feasibility of performing retrogression and reaging (RRA) heat treatments on 2099 aluminum-lithium alloy. The retrogression temperatures were 200-250 °C and retrogression times were 5-60 min. Half of the samples were exposed to a salt fog environment. Interestingly, the samples exposed to salt spray had consistently higher mechanical tensile properties than those which were not exposed.