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Abstract
The present commercial Al-Li alloys are based on the Al-Cu or Al-Cu-Mg alloy systems. In this paper, the influence of lithium on Al-Zn-Mg-Cu alloys is considered. It is shown that lithium inhibits the formation of GP zones and meastable MgZn2, which results in a decrease in the natural ageing behaviour. As the lithium concentration increases, coarse MgZn2 is formed at lithium concentrations less than 1 wt%, which decreases the extent of artificial age hardening, as well as natural ageing. At lithium concentrations above 2 wt%, ordered Al3Li is formed, but instead of MgZn2 precipitating, a coarse T phase is produced. As a result dual phase precipitation hardening is not obtained in lithium containing 7000 series alloys strengthened by MgZn2. Strengthening can be obtained if the Zn, Mg and Cu concentrations give S phase strengthening, rather than MgZn2.
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