Aerospace materials must deliver high performance while every kilogram affects payload, fuel use and operating economics. Selection therefore emphasizes specific strength, stiffness, fatigue, damage tolerance, temperature capability and environmental resistance.
Aluminum alloys
High-strength aluminum alloys remain important in airframes because they combine low density, mature manufacturing routes and repairability. Corrosion protection and fatigue design remain central.
Titanium alloys
Titanium offers an exceptional combination of specific strength, corrosion resistance and elevated-temperature capability. It is widely used where aluminum becomes temperature-limited or where corrosion and compatibility matter.
Nickel-base superalloys
Turbine hot sections rely on nickel-base superalloys engineered for creep resistance, oxidation resistance and microstructural stability. Directional solidification, single-crystal casting and thermal barrier coatings extend temperature capability further.
Composites
Carbon-fiber composites provide high specific stiffness and strength and enable integrated structures. Design must account for anisotropy, impact damage, moisture, repair and inspection.
Selection is system-level
Material choice must be compatible with joining, coatings, inspection, galvanic couples, fire requirements, certification and long-term maintenance. A material with the best laboratory property may not deliver the best aircraft-level solution.
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