Titanium alloys serve critical aircraft, engine, rocket, missile, and spacecraft structures because they combine high specific strength, heat resistance, fatigue life, corrosion resistance, and compatibility with composite materials. This overview maps those properties to representative aerospace components and operating temperatures.
Titanium is a major structural material for aircraft, especially engine fans, compressor disks, and blades. Its combination of load capacity, heat resistance, low weight, and reliability also supports launch vehicles, orbital stations, spacecraft, missiles, and other demanding systems.
Airframe alloys generally work below 350°C and require high specific strength, toughness, fatigue resistance, and weldability. Typical parts include landing gear, frames, beams, skins, and heat shields. Engine applications include compressor disks, blades, drums, rotors, and casings. The Ilyushin Il-76 uses high-strength BT22 titanium for landing gear and load-bearing beams; the F-22 uses thin-wall titanium structures around its hot rear fuselage. Titanium accounts for about 20% of the J-20 airframe by weight. Titanium fasteners include rivets, bolts, lockbolts, titanium-niobium rivets, and bonded nuts.
| Metal | Density, g/cm³ | Specific strength |
|---|---|---|
| High-strength steel | 7.85 | 23 |
| Stainless steel | 7.7–8.0 | 7.9 |
| Titanium alloy | 4.5 | 33 |
| Aluminum alloy | 2.7 | 21.4 |
| Magnesium alloy | 1.74 | 16 |
| Field | Useful characteristics | Representative parts |
|---|---|---|
| Jet engines | High yield-strength/density and fatigue-strength/density ratios below 500°C, thermal stability, and atmospheric corrosion resistance | Compressor disks, stator and rotor blades, cases, combustor shells, exhaust structures, center bodies, and jet pipes |
| Airframes | High specific strength near 300°C | Firewalls, skins, spars, landing gear, ribs, bulkheads, fasteners, ducts, doors, and tie rods |
| Rockets, missiles, and spacecraft | High specific strength with adequate ductility and toughness from room to cryogenic temperature | Pressure vessels, propellant tanks, engine and missile cases, cabin skins and frames, landing gear, and lunar modules |
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