Abstract: A method of manufacturing fine grain titanium alloy sheets that is suitable for superplastic forming (SPF) is disclosed. In one embodiment, a high strength titanium alloy comprising: Al: about 4.5% to about 5.5%, V: about 3.0% to about 5.0%, Mo: about 0.3% to about 1.8%, Fe: about 0.2% to about 0.8%, O: about 0.12% to about 0.25% with balance titanium is forged and hot rolled to sheet bar, which is then fast-cooled from a temperature higher than beta transus. According to this embodiment, the sheet bar is heated between about 1400° F. to about 1550° F. and rolled to intermediate gage. After reheating to a temperature from about 1400° F. to about 1550° F., hot rolling is performed in a direction perpendicular to the previous rolling direction to minimize anisotropy of mechanical properties. The sheets are then annealed at a temperature between about 1300° F. to about 1550° F. followed by grinding and pickling.

Abstract: An oxidation resistant, high strength titanium alloy, particularly adapted for use in the manufacture of automotive exhaust system components and other applications requiring oxidation resistance and strength at elevated temperatures. The alloy comprises, in weight percent, iron less than 0.5, or 0.2 to less than 0.5%, oxygen 0.02 to less than 0.15%, silicon 0.15 to 0.6%, and balance titanium. Optional alloying elements are Al, Nb, V, Mo, Sn, Zr, Ni, Cr and Ta, with a total content of less than 1.5.

Abstract: An oxidation resistant, high strength titanium alloy, particularly adapted for use in the manufacture of automotive exhaust system components and other applications requiring oxidation resistance and strength at elevated temperatures. The alloy comprises, in weight percent, iron less than 0.5, or 0.2 to less than 0.5%, oxygen 0.02 to less than 0.15%, silicon 0.15 to 0.6%, and balance titanium. Optional alloying elements are Al, Nb, V, Mo, Sn, Zr, Ni, Cr and Ta, with a total content of less than 1.5.

Abstract: Methods for the manufacture of the above-mentioned titanium alloy for use in combustion engine exhaust systems are disclosed herein. An exemplary method of the disclosed subject matter for the manufacture of titanium alloy for use in a high temperature and high stress environment includes performing a first heat treatment of the titanium alloy at a first temperature, rolling the titanium alloy to a desired thickness, performing a second heat treatment of the titanium alloy at a second temperature, and performing a third heat treatment of the titanium alloy at a third temperature. In some embodiments, the first temperature is selected such that recrystallization and softening of the titanium alloy is optimized without substantial coarsening of second phase particles and can be approximately 1500-1600° F. In some embodiments, the rolling of the titanium alloy reduces the thickness of the titanium alloy by at least than 65%.

Abstract: An oxidation resistant, high strength titanium alloy, particularly adapted for use in the manufacture of automotive exhaust system components and other applications requiring oxidation resistance and strength at elevated temperatures. The alloy comprises, in weight percent, iron less than 0.5, or 0.2 to less than 0.5%, oxygen 0.02 to less than 0.15%, silicon 0.15 to 0.6%, and balance titanium. Optional alloying elements are Al, Nb, V, Mo, Sn, Zr, Ni, Cr and Ta, with a total content of less than 1.5.

Abstract: High strength alpha-beta alloy comprising essentially Al: 4.5-5.5%, V: 3.0-5.0%, Mo: 0.3-1.8%, Fe: 0.2-1.2%, oxygen 0.12-0.25% Ti: balance. All other incidental elements should be less than 0.1% for each element and less than 0.5% in total. The alloy possesses improved machinability and ballistic performance compared to Ti-6Al-4V.

Abstract: An oxidation resistant, high strength titanium alloy, particularly adapted for use in the manufacture of automotive exhaust system components and other applications requiring oxidation resistance and strength at elevated temperatures. The alloy comprises, in weight percent, iron less than 0.5, or 0.2 to less than 0.5% oxygen 0.02 to less than 0.15%, silicon 0.15 to 0.6%, and balance titanium. Optional alloying elements are Al, Nb, V, Mo, Sn, Zr, Ni, Cr and Ta, with a total content of less than 1.5.

Abstract: High strength alpha-beta alloy comprising essentially Al: 4.5-5.5%, V: 3.0-5.0%, Mo: 0.3-1.8%, Fe: 0.2-1.2%, oxygen 0.12-0.25% Ti: balance. All other incidental elements should be less than 0.1% for each element and less than 0.5% in total. The alloy possesses improved machinability and ballistic performance compared to Ti-6AI-4V.

Abstract: Titanium alloys comprising from about 2.5% to about 5.4% aluminum, from about 2.0% to about 3.4% vanadium, from about 0.2% to about 2.0% iron, and from 0.2% to about 0.3% oxygen are described. Such alloys also can comprise elements selected from the group consisting of chromium, nickel, carbon, nitrogen, perhaps other trace elements, and mixtures thereof, wherein the weight percent of each such element is 0.1% or less, and wherein the total weight of such elements is generally about 0.5% or less. A method for producing titanium alloys also is described. The method first comprises providing an ingot having the composition described above, and then .alpha.-.beta. processing the ingot to provide an .alpha.-.beta. alloy. Armor plates comprising an .alpha.-.beta.-processed titanium alloy also are described, as well as a method for making such armor plates. Armor plates produced according to the method with thicknesses of from about 0.625 inch to about 0.679 inch (from about 15.9 mm to about 17.2 mm) have V.sub.