Aluminum-copper alloys containing vanadium
View Patent ↗New 2xxx aluminum alloys containing vanadium are disclosed. In one embodiment, the aluminum alloy includes 3.3-4.1 wt. % Cu, 0.7-1.3 wt. % Mg, 0.01-0.16 wt. % V, 0.05-0.6 wt. % Mn, 0.01 to 0.4 wt. % of at least one grain structure control element, the balance being aluminum, incidental elements and impurities. The new alloys may realize an improved combination of properties, such as in the T39 or T89 tempers.
1. An aluminum alloy consisting essentially of:
3.3-4.1 wt. % Cu;
0.7-1.3 wt. % Mg;
0.01-0.16 wt. % V;
0.05-0.6 wt. % Mn;
0.05 to 0.20 wt. % Zr;
up to 0.6 wt. %
the balance being aluminum, incidental elements and impurities;
wherein the combined amount of copper and magnesium is in the range of from 4.0 wt. % to 5.1 wt. %; and
wherein the ratio of copper to magnesium is in the range of from 2.6 to 5.5.
2. The aluminum alloy of claim 1 , comprising 0.05-0.15 wt. % V.
3. The aluminum alloy of claim 1 , wherein the impurities comprise Fe and Si, and wherein the alloy contains not greater than 0.15 wt. % Fe and not greater than 0.10 wt. % Si.
4. The aluminum alloy of claim 3 , wherein the impurities comprise Zn, and wherein the alloy contains not greater than 0.25 wt. % Zn.
5. The aluminum alloy of claim 4 , wherein the alloy is substantially free of Ag.
6. A wrought product produced from the aluminum alloy of claim 1 .
7. The wrought product of claim 6 , wherein the wrought product is a plate product.
8. A wrought product produced from the aluminum alloy of claim 1 , wherein the wrought product realizes a strength-to-toughness combination that satisfies the expression FT≧146.1-0.062*TYS, wherein FT is the plane stress fracture toughness in K app as measured in accordance with ASTM E561 and ASTM B646, using the a 16 inch wide panel, having a thickness of 0.25 inch, and an initial crack length (2ao) of 4 inches, and where TYS is the longitudinal tensile yield strength of the alloy in MPa as measured in accordance with ASTM E8 and B557.
9. A wrought product produced from the aluminum alloy of claim 1 , wherein the wrought product realizes a strength-to-toughness combination that satisfies the expression FT≧456-0.611*TYS at a minimum tensile yield strength of 460 MPa, where FT is the unit propagation energy in KJ/m 2 of the alloy as measured in accordance with ASTM B871, as provided above, and where TYS is the longitudinal tensile yield strength of the alloy in MPa as measured in accordance with ASTM E8 and B557.
10. A plate in the T89 temper produced from the aluminum alloy of claim 1 , wherein the plate realizes at least a 5% improvement in fracture toughness relative to a comparable plate product in the T89 temper produced from an AA2624 alloy, and wherein the plate product plate realizes at least equivalent tensile yield strength relative to the comparable plate product in the T89 temper produced from the AA2624 alloy.
11. The aluminum alloy of claim 1 , wherein Cu+Mg is in the range of from 4.1 wt. % to 5.0 wt. %.
12. The aluminum alloy of claim 1 , wherein Cu+Mg is in the range of from 4.3 wt. % to 4.8 wt. %.
13. The aluminum alloy of claim 1 , wherein the ratio of copper to magnesium is in the range of from 2.75 to 5.0.
14. The aluminum alloy of claim 11 , wherein the ratio of copper to magnesium is in the range of from 3.0 to 4.75.
15. The aluminum alloy of claim 12 , wherein the ratio of copper to magnesium is in the range of from 3.25 to 4.5.
16. The aluminum alloy of claim 1 , wherein the alloy includes from 0.05 wt. % to 0.6 wt. % Mn.
17. The aluminum alloy of claim 14 , wherein the alloy includes from 0.1 wt. % to 0.5 wt. % Mn.
18. The aluminum alloy of claim 15 , wherein the alloy includes from 0.2 wt. % to 0.4 wt. % Mn.
19. The aluminum alloy of claim 15 , wherein the alloy includes at least 0.05 wt. % V.
20. The aluminum alloy of claim 15 , wherein the alloy includes at least 0.07 wt. % V.