Abstract
Within the UR, research has concentrated on alloys of composition A1--2.5%Li-1.2%Cu-0.7%Mg-O.l2%Zr (8090) which is a medium strength replacement for 2014. Ageing this lithium-containing alloy at. an elevated temperature produces a mixture of phases which are, in order of importance, S'(A13Li), S(A1,CuMg) and TI(A12CuLi). Changing the magnesium content of the alloy changes the relative proportions of the latter two phases, and also infl.uences the volume fraction of S' that is produced. A systematic study has been made of the effect of magnesium (in thc range 0-2%) on the relationship between the mi.crostructure and mechanical properties of these alloys.
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