Titanium alloys

A titanium alloy comprising, in weight percent based on total alloy weight:

• 4.2 to 4.4 aluminum;
• 1.5 to 1.75 tin;
• 1.5 to 1.75 zirconium;
• 4.0 to 4.25 molybdenum;
• 4.0 to 4.25 chromium;
• 0.02 to 0.03 silicon;
• 0 to 0.30 iron;
• 0 to 0.20 oxygen;
• 0 to 0.5 nitrogen;
• 0 to 0.0125 hydrogen;
• 0 to 0.08 carbon;
• 1.0 to 1.8 vanadium;
• 0 to less than 0.1 germanium;
• 0 to 0.1 of each of niobium, tungsten, hafnium, nickel, gallium, antimony, tantalum, manganese, cobalt, and copper;
• titanium;
• and
• impurities;
• wherein an aluminum equivalent value of the titanium alloy is 6.1 to 6.9 and a molybdenum equivalent value of the titanium alloy is 4.8 to 10.9.

A titanium alloy comprising, in weight percent based on total alloy weight:

• 3.65 to 4.4 aluminum;
• 1.5 to 2.3 tin;
• 1.5 to 2.2 zirconium;
• 3.0 to 4.25 molybdenum;
• 3.0 to 4.25 chromium;
• 0.02 to 0.03 silicon;
• 0 to 0.30 iron;
• 0 to 0.20 oxygen;
• 0 to 0.5 nitrogen;
• 0 to 0.0125 hydrogen;
• 0 to 0.08 carbon;
• 0 to 1.8 vanadium;
• 0 to less than 0.1 germanium;
• 0 to 0.1 of each of niobium, tungsten, hafnium, nickel, gallium, antimony, tantalum, manganese, cobalt, and copper;
• titanium;
• and
• impurities;
• wherein an aluminum equivalent value of the titanium alloy is 6.1 to 6.5 and a molybdenum equivalent value of the titanium alloy is 4.8 to 10.9;
• and
• wherein the titanium alloy exhibits a yield strength of at least 137 ksi, an ultimate tensile strength of at least 148 ksi, and a fracture toughness of at least 85 ksi√(in).