Aluminum alloy 2024 has high static strength and fatigue strength, so it has been applied to the primary structures of aircrafts, however, it has disadvantages of corrosion resistance and form-ability. Alcoa developed 6013 as the alternative alloy to 2024, but 6013-T6511 has 20 percent lower strength than 2024-T3511. New alloy 2013, which has been developed to be alternated to 6013, can be extruded to thin complex shape. 2013-T6511 extrusion has higher strength and much higher corrosion-resistance than 2024-T3511. Therefore, 2013 can reduce the assembly cost by means of integrated structure and it can reduce maintenance cost by re-coating postponement. From this perspective, 2013-T6511 extrusion can be the only alternative alloy to 2024-T3511. For the application of new alloy to aircraft, alloy and temper "2013-T6511" has been designated by The Aluminum Association in 2003 and its specification has been published as AMS4326 by AMS of SAE. And the registration to Metallic Material Properties Development and Standardization (old MIL specification) is in progress.
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