2XXX series aluminum lithium alloys having low strength differential
View Patent ↗The present application discloses wrought 2xxx Al—Li alloy products that are work insensitive. The wrought aluminum alloy products generally include from about 2.75 wt. % to about 5.0 wt. % Cu, from about 0.2 wt. % to about 0.8 wt. % Mg, where the ratio of copper-to-magnesium ratio (Cu/Mg) in the aluminum alloy is in the range of from about 6.1 to about 17, from about 0.1 wt. % to 1.10 wt. % Li, from about 0.3 wt. % to about 2.0 wt. % Ag, from 0.50 wt. % to about 1.5 wt. % Zn, up to about 1.0 wt. % Mn, the balance being aluminum, optional incidental elements, and impurities. The wrought aluminum alloy products may realize a low strength differential and in a short aging time due to their work insensitive nature.
1. A wrought aluminum alloy product consisting of:
from 2.75 wt. % to 5.0 wt. % Cu;
from 0.2 wt. % to 0.8 wt. % Mg;
wherein the ratio of copper-to-magnesium ratio (Cu/Mg) in the wrought aluminum alloy product is in the range of from 8.0 to 16;
from 0.1 wt. % to 1.10 wt. % Li;
from 0.30 wt. % to 2.0 wt. % Ag;
from 0.4 wt.% to 1.5 wt. % Zn;
wherein wt. % Ag+wt. % Zn in the wrought aluminum alloy product is at least 0.89 wt. %;
up to 1.0 wt. % Mn; and
the balance being aluminum, optional incidental elements, and impurities.
2. The wrought aluminum alloy product of claim 1 , having at least 0.35 wt. % Ag.
3. The wrought aluminum alloy product of claim 2 , having at least 0.70 wt. % Zn.
4. The wrought aluminum alloy product of claim 3 , having at least 0.40 wt. % Ag.
5. The wrought aluminum alloy product of claim 1 , having not greater than 1.05 wt. % Li.
6. The wrought aluminum alloy product of claim 5 , having not greater than 1.00 wt. % Li.
7. The wrought aluminum alloy product of claim 1 , having not greater than 0.95 wt. % Li.
8. The wrought aluminum alloy product of claim 1 , having not greater than 0.90 wt. % Li.
9. The wrought aluminum alloy product of claim 1 , having not greater than 0.85 wt. % Li.
10. The wrought aluminum alloy product of claim 5 , having at least 0.2 wt. % Li.
11. The wrought aluminum alloy product of claim 6 , having at least 0.3 wt. % Li.
12. The wrought aluminum alloy product of claim 7 , having at least 0.4 wt. % Li.
13. The wrought aluminum alloy product of claim 8 , having at least 0.5 wt. % Li.
14. The wrought aluminum alloy product of claim 9 , having at least 0.55 wt. % Li.
15. The wrought aluminum alloy product of claim 1 , having from 0.70 to 0.90 wt. % Li.
16. The wrought aluminum alloy product of claim 1 , having from 0.75 to 0.85 wt. % Li.
17. The wrought aluminum alloy product of claim 15 , having from 0.40 to 0.60 wt. % Ag.
18. The wrought aluminum alloy product of claim 16 , having from 0.45 to 0.55 wt. % Ag.
19. The wrought aluminum alloy product of claim 17 , having from 0.70 to 0.90 wt. % Zn.
20. The wrought aluminum alloy product of claim 18 , having from 0.75 to 0.85 wt. % Zn.
21. The wrought aluminum alloy product of claim 19 , having from 0.20 to 0.40 wt. % Mn.
22. The wrought aluminum alloy product of claim 20 , having from 0.25 to 0.35 wt. % Mn.