Creep resistant titanium alloys

Patent metadata

Field	Value
Publication number	US-11920231-B2
Application number	US-202217649238-A
Country	US
Kind code	B2
Filing date	Jan 28, 2022
Priority date	Aug 28, 2018
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

A non-limiting embodiment of a titanium alloy comprises, in weight percentages based on total alloy weight: 5.5 to 6.5 aluminum; 1.5 to 2.5 tin; 1.3 to 2.3 molybdenum; 0.1 to 10.0 zirconium; 0.01 to 0.30 silicon; 0.1 to 2.0 germanium; titanium; and impurities. A non-limiting embodiment of the titanium alloy comprises a zirconium-silicon-germanium intermetallic precipitate, and exhibits a steady-state creep rate less than 8×10 −4 (24 hrs) −1 at a temperature of at least 890° F. under a load of 52 ksi.

First claim

We claim:

1. A titanium alloy consisting of, in weight percentages based on total alloy weight:
5.5 to 6.5 aluminum;
1.5 to 2.5 tin;
1.3 to 2.3 molybdenum;
0.1 to 10.0 zirconium;
0.01 to 0.30 silicon;
0.1 to 2.0 germanium;
0 to 0.30 oxygen;
0 to 0.30 iron;
0 to 0.05 nitrogen;
0 to 0.05 carbon;
0 to 0.015 hydrogen;
0 to 0.1 each of niobium, tungsten, hafnium, nickel, gallium, antimony, vanadium, tantalum, manganese, cobalt and copper;
titanium; and
impurities.

2. The titanium alloy of claim 1 consisting of, in weight percentages based on total alloy weight:
5.5 to 6.5 aluminum;
1.7 to 2.1 tin;
1.7 to 2.1 molybdenum;
3.4 to 4.4 zirconium;
0.03 to 0.11 silicon;
0.1 to 0.4 germanium;
0 to 0.30 oxygen;
0 to 0.30 iron;
0 to 0.05 nitrogen;
0 to 0.05 carbon;
0 to 0.015 hydrogen;
0 to 0.1 each of niobium, tungsten, hafnium, nickel, gallium, antimony, vanadium, tantalum, manganese, cobalt and copper;
titanium; and
impurities.

3. The titanium alloy of claim 1 consisting of, in weight percentages based on total alloy weight:
5.9 to 6.0 aluminum;
1.9 to 2.0 tin;
1.8 to 1.9 molybdenum;
3.5 to 4.3 zirconium;
0.06 to 0.11 silicon;
0.1 to 0.4 germanium;
0 to 0.30 oxygen;
0 to 0.30 iron;
0 to 0.05 nitrogen;
0 to 0.05 carbon;
0 to 0.015 hydrogen;
0 to 0.1 each of niobium, tungsten, hafnium, nickel, gallium, antimony, vanadium, tantalum, manganese, cobalt and copper;
titanium; and
impurities.

4. The titanium alloy of claim 1 , wherein the titanium alloy exhibits a steady-state creep rate less than 8×10 −4 (24 hrs) −1 at a temperature of at least 890° F. under a load of 52 ksi.

5. A method of making a titanium alloy, the method comprising:
solution treating a titanium alloy at 1780° F. to 1800° F. for 4 hours;
cooling the titanium alloy to ambient temperature at a rate depending on a cross-sectional thickness of the titanium alloy;
aging the titanium alloy at 1025° F. to 1125° F. for 8 hours; and
air cooling the titanium alloy,
wherein the titanium alloy has the composition recited in claim 1 .

6. The titanium alloy of claim 1 , wherein the titanium alloy exhibits an ultimate tensile strength of at least 130 ksi at 900° F.

7. A titanium alloy consisting essentially of, in weight percentages based on total alloy weight:
5.5 to 6.5 aluminum;
1.5 to 2.5 tin;
1.3 to 2.3 molybdenum;
0.1 to 10.0 zirconium;
0.01 to 0.30 silicon;
0.1 to 2.0 germanium;
titanium; and
impurities.

8. The titanium alloy of claim 7 , wherein an aluminum content in the alloy is, in weight percentages based on total alloy weight, 5.9 to 6.0.

9. The titanium alloy of claim 7 , wherein a tin content in the alloy is, in weight percentages based on total alloy weight, 1.7 to 2.1.

10. The titanium alloy of claim 7 , wherein a tin content in the alloy is, in weight percentages based on total alloy weight, 1.9 to 2.0.

11. The titanium alloy of claim 6 , wherein a molybdenum content in the alloy is, in weight percentages based on total alloy weight, 1.7 to 2.1.

12. The titanium alloy of claim 6 , wherein a molybdenum content in the alloy is, in weight percentages based on total alloy weight, 1.8 to 1.9.

13. The titanium alloy of claim 6 , wherein a zirconium content in the alloy is, in weight percentages based on total alloy weight, 3.4 to 4.4.

14. The titanium alloy of claim 6 , wherein a zirconium content in the alloy is, in weight percentages based on total alloy weight, 3.5 to 4.3.

15. The titanium alloy of claim 7 , wherein a silicon content in the alloy is, in weight percentages based on total alloy weight, 0.03 to 0.11.

16. The titanium alloy of claim 7 , wherein a silicon content in the alloy is, in weight percentages based on total alloy weight, 0.06 to 0.11.

17. The titanium alloy of claim 6 , wherein a germanium content in the alloy is, in weight percentages based on total alloy weight, 0.1 to 0.4.

18. A titanium alloy consisting essentially of, in weight percentages based on total alloy weight:
2 to 7 aluminum;
0 to 5 tin;
0 to 5 molybdenum;
0.1 to 10.0 zirconium;
0.01 to 0.30 silicon;
0.05 to 0.4 germanium;
0 to 0.30 oxygen;
0 to 0.30 iron;
0 to 0.05 nitrogen;
0 to 0.05 carbon;
0 to 0.015 hydrogen;
titanium; and
impurities.

19. A titanium alloy consisting essentially of, in weight percentages based on total alloy weight:
5.5 to 6.5 aluminum;
1.5 to 2.5 tin;
1.3 to 2.3 molybdenum;
0.1 to 10.0 zirconium;
0.01 to 0.30 silicon;
0.1 to 2.0 germanium;
0 to 0.30 oxygen;
0 to 0.30 iron;
0 to 0.05 nitrogen;
0 to 0.05 carbon;
0 to 0.015 hydrogen;
0 to 0.1 each of niobium, tungsten, hafnium, nickel, gallium, antimony, vanadium, tantalum, manganese, cobalt, and copper;
titanium; and
impurities.

20. The titanium alloy of claim 19 , wherein an aluminum content in the alloy is, in weight percentages based on total alloy weight, 5.9 to 6.0.

21. The titanium alloy of claim 19 , wherein a tin content in the alloy is, in weight percentages based on total alloy weight, 1.7 to 2.1.

22. The titanium alloy of claim 19 , wherein a tin content in the alloy is, in weight percentages based on total alloy weight, 1.9 to 2.0.

23. The titanium alloy of claim 19 , wherein a molybdenum content in the alloy is, in weight percentages based on total alloy weight, 1.7 to 2.1.

24. The titanium alloy of claim 19 , wherein a molybdenum content in the alloy is, in weight percentages based on total alloy weight, 1.8 to 1.9.

25. The titanium alloy of claim 19 , wherein a zirconium content in the alloy is, in weight percentages based on total alloy weight, 3.4 to 4.4.

26. The titanium alloy of claim 19 , wherein a zirconium content in the alloy is, in weight percentages based on total alloy weight, 3.5 to 4.3.

27. The titanium alloy of claim 19 , wherein a silicon content in the alloy is, in weight percentages based on total alloy weight, 0.03 to 0.11.

28. The titanium alloy of claim 19 , wherein a silicon content in the alloy is, in weight percentages based on total alloy weight, 0.06 to 0.11.

29. The titanium alloy of claim 19 , wherein a germanium content in the alloy is, in weight percentages based on total alloy weight, 0.1 to 0.4.

Assignees

• Ati Properties Llc

Inventors

• Mantione John V
• Bryan David J
• Garcia-Avila Matias

Classifications

• C22F1/183 Primary

  of titanium or alloys based thereon · CPC title

• C22C14/00 Primary

  Alloys based on titanium · CPC title