6XXX aluminum alloys
View Patent ↗New 6xxx aluminum alloys having an improved combination of properties are disclosed. The new 6xxx aluminum alloy generally include from 0.30 to 0.53 wt. % Si, from 0.50 to 0.65 wt. % Mg wherein the ratio of wt. % Mg to wt. % Si is at least 1.0:1 (Mg:Si), from 0.05 to 0.24 wt. % Cu, from 0.05 to 0.14 wt. % Mn, from 0.05 to 0.25 wt. % Fe, up to 0.15 wt. % Ti, up to 0.15 wt. % Zn, up to 0.15 wt. % Zr, not greater than 0.04 wt. % V, and not greater than 0.04 wt. % Cr, the balance being aluminum and other elements.
1. A recrystallized 6xxx aluminum alloy product consisting of:
0.30-0.53 wt. % Si;
0.50-0.65 wt. % Mg;
wherein a ratio of wt. % Mg to wt. % Si is at least 1.05:1 (Mg:Si);
0.05-0.24 wt. % Cu;
0.05-0.14 wt. % Mn;
0.05-0.25 wt. % Fe;
up to 0.15 wt. % Ti;
up to 0.15 wt. % Zn;
up to 0.15 wt. % Zr;
not greater than 0.04 wt. % V;
not greater than 0.04 wt. % Cr;
the balance being aluminum and other elements, wherein each of the other elements does not exceed 0.10 wt. % in the recrystallized 6xxx aluminum alloy product, wherein a total of the other elements is not more than 0.30 wt. % in the recrystallized 6xxx aluminum alloy product;
wherein the recrystallized 6xxx aluminum alloy product is a sheet product; and
wherein the recrystallized 6xxx aluminum alloy product realizes a typical long-transverse (LT) tensile yield strength of at least 200 MPa and a critical fracture strain (CFS) of at least 25% in an artificially aged condition.
2. The recrystallized 6xxx aluminum alloy product of claim 1 having 0.35-0.50 wt. % Si.
3. The recrystallized 6xxx aluminum alloy product of claim 1 having 0.40-0.50 wt. % Si.
4. The recrystallized 6xxx aluminum alloy product of claim 1 having 0.55-0.65 wt. % Mg.
5. The recrystallized 6xxx aluminum alloy product of claim 1 , wherein the ratio of wt. % Mg to wt. % Si is at least 1.10:1.
6. The recrystallized 6xxx aluminum alloy product of claim 1 , wherein the ratio of wt. % Mg to wt. % Si is at least 1.20:1.
7. The recrystallized 6xxx aluminum alloy product of claim 1 , wherein the ratio of wt. % Mg to wt. % Si is at least 1.30:1.
8. The recrystallized 6xxx aluminum alloy product of claim 1 , wherein the ratio of wt. % Mg to wt. % Si is not greater than 1.75:1.
9. The recrystallized 6xxx aluminum alloy product of claim 1 having not greater than 0.22 wt. % Cu.
10. The recrystallized 6xxx aluminum alloy product of claim 1 having not greater than 0.20 wt. % Cu.
11. The recrystallized 6xxx aluminum alloy product of claim 1 having not greater than 0.19 wt. % Cu.
12. The recrystallized 6xxx aluminum alloy product of claim 1 having at least 0.07 wt. % Cu.
13. The recrystallized 6xxx aluminum alloy product of claim 1 having at least 0.09 wt. % Cu.
14. The recrystallized 6xxx aluminum alloy product of claim 1 having at least 0.11 wt. % Cu.
15. The recrystallized 6xxx aluminum alloy product of claim 1 having 0.06-0.13 wt. % Mn.
16. The recrystallized 6xxx aluminum alloy product of claim 1 having 0.07-0.12 wt. % Mn.
17. The recrystallized 6xxx aluminum alloy product of claim 1 having not greater than 0.03 wt. % each of V and Cr.
18. The recrystallized 6xxx aluminum alloy product of claim 1 having not greater than 0.02 wt. % V.
19. The recrystallized 6xxx aluminum alloy product of claim 1 having not greater than 0.02 wt. % Cr.
20. The recrystallized 6xxx aluminum alloy product of claim 1 , wherein the sheet product has a thickness of from 1.5 mm to 4.0 mm.