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US 9,956,629 B2Granted
Titanium alloy for fastener applications
AssigneeThe Boeing Company
InventorRobert D. Briggs
Life of this patent
Estimating the term…
Abstract
A method and apparatus for forming a fastener for an aircraft. An annealed titanium alloy is provided with about 5.50 to about 6.75 weight percent aluminum, about 3.50 to about 4.50 weight percent vanadium, more than 0.20 weight percent oxygen, and more than 0.30 weight percent iron. Operations are performed to form the fastener for the aircraft from the annealed titanium alloy.
Claims16
A fastener comprising:
- a titanium alloy formed from between substantially 50 and 70 percent titanium scrap without using a solution treat and age process to have 5.50 to 6.75 weight percent aluminum, 4.01 to 4.50 weight percent vanadium, and to have an ultimate tensile strength of at least 160 ksi and a shear strength of at least 95 ksi when a diameter of the fastener is less than about 0.625 inches;
- wherein the titanium scrap comprises at least one of Ti-10V-2Fe-3Al scrap and Ti-5Al-5Mo-5V-3Cr scrap.
A method for making a titanium alloy, the method comprising:
- manufacturing the titanium alloy from between substantially 50 and 70 percent titanium scrap without using a solution treat and age process to have about 5.50 to about 6.75 weight percent aluminum, about 4.01 to about 4.50 weight percent vanadium, and have an ultimate tensile strength of at least 160 ksi and a shear strength of at least 95 ksi when a diameter of the fastener is less than about 0.625 inches;
- wherein the titanium scrap comprises at least one of Ti-10V-2Fe-3Al scrap and Ti-5Al-5Mo-5V-3Cr scrap.
A method for forming a fastener for an aircraft, the method comprising:
- annealing a titanium alloy from between substantially 50 and 70 percent titanium scrap to form a fastener stock;
- manufacturing a the fastener from the fastener stock with about 5.50 to about 6.75 weight percent aluminum, about 4.01 to about 4.50 weight percent vanadium;
- and
- performing operations to form the fastener for the aircraft from the titanium alloy;
- wherein the titanium scrap comprises at least one of Ti-10V-2Fe-3Al scrap and Ti-5Al-5Mo-5V-3Cr scrap.
2 more elements
Dependencies are inferred from the claim text.