Article

Journal of Materials Engineering and Performance

, Volume 20, Issue 6, pp 989-996

First online:

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

  • N. WardAffiliated withMechanical Engineering Department, Loyola Marymount University
  • , A. TranAffiliated withMechanical Engineering Department, Loyola Marymount University
  • , A. AbadAffiliated withNorthrop Grumman Air Combat Systems
  • , E. W. LeeAffiliated withNaval Air Systems Command, Naval Air Warfare
  • , M. HahnAffiliated withNorthrop Grumman Air Combat Systems
  • , E. FordanAffiliated withNorthrop Grumman Air Combat Systems
  • , O. S. Es-SaidAffiliated withMechanical Engineering Department, Loyola Marymount University Email author 

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Abstract

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.

Keywords

aluminum-lithium alloys heat treatable aluminum alloys retrogression and reaging