The structure and properties of Al–Li–Cu–Mg–Zr alloy AA 2091 in sheet form have been studied. Static and dynamic behaviour of material aged to the ‘damage tolerant’ category has been found to be at least equivalent to current BS L109 (AA 2024-T3) sheet while re-solution heat treatment did not appear to degrade properties. In contrast, although static strength parameters of stretched material aged to the ‘medium strength’ category were comparable with those of BS L157 (AA 2014-T6), re-solution heat treatment effected a noticeable decrease, with a failure to achieve 0·2%PS levels. Mechanical properties and subsequent fracture behaviour were correlated with submicrostructure throughout the investigation.
MST/958
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