THE ROLE OF MAGNESIUM IN Al-Li-Cu-Mg-Zr ALLOYS
Harris , S.
Noble , B.
Dinsdale , K.
- Publisher: HAL CCSD
[ PHYS.HIST ] Physics [physics]/Physics archives
Within the UK, research has concentrated on alloys of composition Al-2.5%Li-1.2%Cu-0.7%Mg-0.12%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, δ'(Al3Li), S(Al2CuMg) and T1(Al2CuLi). Changing the magnesium content of the alloy changes the relative proportions of the latter two phases, and also influences the volume fraction of δ' that is produced. A systematic study has been made of the effect of magnesium (in the range 0-2%) on the relationship between the microstructure and mechanical properties of these alloys.