Alpha-beta titanium alloy having improved elevated temperature properties and superplasticity
A high strength alpha-beta alloy is provided that has improved high temperature oxidation resistance, high temperature strength and creep resistance, and improved superplasticity. In one form, the alloy comprises about 4.5 wt % to about 5.5 wt % aluminum, about 3.0 wt % to about 5.0 wt % vanadium, about 0.3 wt % to about 1.8 wt % molybdenum, about 0.2 wt % to about 1.2 wt % iron, about 0.12 wt % to about 0.25 wt % oxygen, about 0.10 wt % to about 0.40 wt % silicon, with the balance titanium and incidental impurities, with each being less than about 0.1 wt % and about 0.5 wt %, respectively, in total.
1. An alpha-beta titanium alloy comprising:
aluminum in an amount ranging between about 4.5 wt % to about 5.5 wt %;
vanadium in an amount ranging between about 3.0 wt % to about 5.0 wt %;
molybdenum in an amount ranging between about 0.72 wt % to about 1.8 wt %;
iron in an amount ranging between about 0.48 wt % to about 1.2 wt % iron;
oxygen in an amount ranging between about 0.12 wt % to about 0.25 wt %;
silicon in an amount ranging between about 0.10 wt % to about 0.40 wt %; and
a balance titanium and incidental impurities, with each being less than about 0.1 wt % and in total less than about 0.5 wt %.
2. The alpha-beta titanium alloy according to claim 1 , wherein the silicon is in an amount ranging between about 0.15wt % to about 0.40 wt %.
3. The alpha-beta titanium alloy according to claim 1 , wherein the silicon is in an amount ranging between about 0.25 wt % to about 0.35 wt %.
4. The alpha-beta titanium alloy according to claim 1 further comprising optional alloying elements selected from the group consisting of niobium, chromium, tin, and zirconium, wherein a total of the optional alloying elements less than about 1.0 wt %.
5. A component comprising an alloy according to claim 1 .
6. An alpha-beta titanium alloy consisting essentially of:
aluminum in an amount ranging between about 4.5 wt % to about 5.5 wt %;
vanadium in an amount ranging between about 3.0 wt % to about 5.0 wt %;
molybdenum in an amount ranging between about 0.72 wt % to about 1.8 wt %;
iron in an amount ranging between about 0.48 wt % to about 1.2 wt % iron;
oxygen in an amount ranging between about 0.12 wt % to about 0.25 wt %;
silicon in an amount ranging between about 0.10 wt % to about 0.40 wt %; and
a balance titanium and incidental impurities, with each being less than about 0.1 wt % and in total less than about 0.5 wt %.
7. The alpha-beta titanium alloy according to claim 6 , wherein the silicon is in an amount ranging between about 0.15 wt % to about 0.40 wt %.
8. The alpha-beta titanium alloy according to claim 6 , wherein the silicon is in an amount ranging between about 0.25 wt % to about 0.35 wt %.
9. A component comprising an alloy according to claim 6 .
10. A high strength alpha-beta titanium alloy having superplasticity at temperatures below about 815° C. (1,500° F.) and having:
molybdenum in an amount ranging between about 0.72 wt % to about 1.8 wt %;
iron in an amount ranging between about 0.48 wt % to about 1.2 wt % iron; and
silicon in an amount ranging between about 0.10 wt % to about 0.40 wt %.
11. The high strength alpha-beta titanium alloy according to claim 10 , wherein the superplasticity results in greater than about 1000% elongation.
12. The high strength alpha-beta titanium alloy according to claim 10 , wherein the alloy has less than about 1mg/cm 2 weight gain at 649° C. (1,200° F.) up to about 200 hours.
13. The high strength alpha-beta titanium alloy according to claim 10 , wherein the alloy has less than about 4.0 mg/cm 2 weight gain at 760° C. (1,400° F.) up to about 200 hours.
14. The high strength alpha-beta titanium alloy according to claim 10 , wherein the silicon is in an amount ranging between about 0.15 wt % to about 0.40 wt %.
15. The high strength alpha-beta titanium alloy according to claim 10 , wherein the silicon is in an amount ranging between about 0.25 wt % to about 0.35 wt %.
16. The high strength alpha-beta titanium alloy according to claim 10 , wherein a creep strain of the alloy is less than about 0.15 over 100 hours at 427° C. (800° F.) and 35 ksi.
17. A component comprising an alloy according to claim 10 .
18. The high strength alpha-beta titanium alloy according to claim 10 comprising vanadium in an amount less than about 5.0 wt %.
19. The high strength alpha-beta titanium alloy according to claim 10 , wherein a density of the alloy is less than about 4.60 g/cm 3 .
20. The alpha-beta titanium alloy according to claim 1 , wherein:
the aluminum is about 5.0 wt %;
the vanadium is about 4.0 wt;
the molybdenum is about 0.75 wt %;
the iron is about 0.50 wt % iron;
the oxygen is about 0.17 wt %; and
the silicon is about 0.3 wt %.
21. An alpha-beta titanium alloy comprising:
aluminum in an amount ranging between about 4.5 wt % to about 5.5 wt %;
vanadium in an amount ranging between about 3.0 wt % to about 5.0 wt %;
molybdenum in an amount ranging between about 0.6 wt % to about 1.8 wt %;
iron in an amount ranging between about 0.4 wt % to about 1.2 wt % iron;
oxygen in an amount ranging between about 0.12 wt % to about 0.25 wt %;
silicon in an amount ranging between about 0.10 wt % to about 0.40 wt %; and
a balance titanium and incidental impurities, with each being less than about 0.1 wt %, respectively, and in total less than about 0.5 wt %.