High strength titanium alloys
A non-limiting embodiment of a titanium alloy comprises, in weight percentages based on total alloy weight: 2.0 to 5.0 aluminum; 3.0 to 8.0 tin; 1.0 to 5.0 zirconium; 0 to a total of 16.0 of one or more elements selected from the group consisting of oxygen, vanadium, molybdenum, niobium, chromium, iron, copper, nitrogen, and carbon; titanium; and impurities. A non-limiting embodiment of the titanium alloy comprises an intentional addition of tin and zirconium in conjunction with certain other alloying additions such as aluminum, oxygen, vanadium, molybdenum, niobium, and iron, to stabilize the α phase and increase the volume fraction of the α phase without the risk of forming embrittling phases, which was observed to increase room temperature tensile strength while maintaining ductility.
1. A titanium alloy comprising, in weight percentages based on total alloy weight:
6.0 to 12.0 vanadium;
3.0 to 8.0 tin;
2.0 to 5.0 aluminum;
1.0 to 5.0 zirconium;
1.0 to 5.0 molybdenum;
0.005 to 0.3 oxygen;
0 to 0.40 iron;
0 to 0.5 chromium;
0.001 to 0.05 carbon;
0 to 0.05 nitrogen;
titanium; and
impurities.
2. The titanium alloy of claim 1 , comprising 8.6 to 11.4 vanadium in weight percent based on total alloy weight.
3. The titanium alloy of claim 1 , comprising 8.6 to 9.4 vanadium in weight percent based on total alloy weight.
4. The titanium alloy of claim 1 , comprising 4.6 to 7.4 tin in weight percent based on total alloy weight.
5. The titanium alloy of claim 1 , comprising 2.0 to 3.9 aluminum in weight percent based on total alloy weight.
6. The titanium alloy of claim 1 , comprising 3.0 to 3.9 aluminum in weight percent based on total alloy weight.
7. The titanium alloy of claim 1 , comprising 2.0 to 3.4 aluminum in weight percent based on total alloy weight.
8. The titanium alloy of claim 1 , comprising 1.6 to 3.4 zirconium in weight percent based on total alloy weight.
9. The titanium alloy of claim 1 , comprising 1.0 to 3.0 molybdenum in weight percent based on total alloy weight.
10. The titanium alloy of claim 1 , comprising 2.0 to 3.0 molybdenum in weight percent based on total alloy weight.
11. The titanium alloy of claim 1 , comprising 0.005 to 0.25 oxygen in weight percent based on total alloy weight.
12. The titanium alloy of claim 1 , comprising 0.01 to 0.40 iron in weight percent based on total alloy weight.
13. The titanium alloy of claim 1 , further comprising niobium, wherein the niobium and vanadium together comprise greater than 6.0 to 12.0 weight percent based on total alloy weight.
14. The titanium alloy of claim 1 , comprising, in weight percentages based on total alloy weight:
8.6 to 11.4 vanadium;
4.6 to 7.4 tin;
2.0 to 3.9 aluminum;
1.6 to 3.4 zirconium;
2.0 to 3.0 molybdenum;
0.005 to 0.3 oxygen;
0.01 to 0.4 iron;
0 to 0.5 chromium;
0.001 to 0.05 carbon;
0.001 to 0.03 nitrogen;
titanium; and
impurities.
15. The titanium alloy of claim 1 , comprising an aluminum equivalent value of 6.0 to 9.0, and a molybdenum equivalent value of 5.0 to 10.0.
16. The titanium alloy of claim 1 , comprising an aluminum equivalent value of 7.0 to 8.0, and a molybdenum equivalent value of 6.0 to 7.0.
17. The titanium alloy of claim 1 , wherein a ratio of aluminum equivalent value to molybdenum equivalent value is 0.6 to 1.3.
18. The titanium alloy of claim 1 , wherein the titanium alloy exhibits, at room temperature, an ultimate tensile strength of at least 170 ksi and an elongation of at least 6%.
19. The titanium alloy of claim 1 , wherein the titanium alloy exhibits, at room temperature, an ultimate tensile strength of at least 180 ksi and an elongation of at least 6%.
20. A titanium alloy consisting of, in weight percentages based on total alloy weight:
6.0 to 12.0 vanadium;
3.0 to 8.0 tin;
2.0 to 5.0 aluminum;
1.0 to 5.0 zirconium;
1.0 to 5.0 molybdenum;
0.005 to 0.3 oxygen;
0 to 0.40 iron;
0 to 0.5 chromium;
0.001 to 0.05 carbon;
0 to 0.05 nitrogen;
titanium; and
impurities.
21. A titanium alloy comprising, in weight percentages based on total alloy weight:
one or more of vanadium and niobium, wherein a total content of vanadium and niobium is 8.6 to 11.4;
4.6 to 7.4 tin;
2.0 to 3.9 aluminum;
1.0 to 3.0 molybdenum;
1.6 to 3.4 zirconium;
0 to 0.5 chromium;
0 to 0.4 iron;
0 to 0.25 oxygen;
0 to 0.05 nitrogen;
0.001 to 0.05 carbon;
titanium; and
impurities.
22. The titanium alloy of claim 21 , wherein a total content of vanadium and niobium is 8.6 to 9.4 in weight percent based on total alloy weight.
23. The titanium alloy of claim 21 , wherein a total content of vanadium and niobium is 10.6 to 11.4 in weight percent based on total alloy weight.
24. The titanium alloy of claim 21 comprising, 2.0 to 3.0 molybdenum in weight percent based on total alloy weight.
25. The titanium alloy of claim 21 comprising 1.0 to 2.0 molybdenum in weight percent based on total alloy weight.
26. The titanium alloy of claim 21 , wherein the titanium alloy comprises an aluminum equivalent value of 7.0 to 8.0.
27. The titanium alloy of claim 21 , wherein the titanium alloy comprises a molybdenum equivalent value of 6.0 to 7.0.
28. The titanium alloy of claim 21 consisting of, in weight percentages based on total alloy weight:
one or more of vanadium and niobium, wherein a total content of vanadium and niobium is 8.6 to 11.4;
4.6 to 7.4 tin;
2.0 to 3.9 aluminum;
1.0 to 3.0 molybdenum;
1.6 to 3.4 zirconium;
0 to 0.5 chromium;
0 to 0.4 iron;
0 to 0.25 oxygen;
0 to 0.05 nitrogen;
0.001 to 0.05 carbon;
titanium; and
impurities.
29. The titanium alloy of claim 28 , wherein an aluminum equivalent value of the titanium alloy 7.0 to 8.0.
30. The titanium alloy of claim 28 , wherein a molybdenum equivalent value of the titanium alloy is 6.0 to 7.0.
31. The titanium alloy of claim 28 , wherein an aluminum equivalent value of the titanium alloy 7.0 to 8.0 and a molybdenum equivalent value of the titanium alloy is 6.0 to 7.0.