Aluminum competes with advanced materials through five key trade-offs.
First, weight: Aluminum (2.7 g/cm³) is lighter than titanium (4.5 g/cm³) but heavier than carbon fiber (1.8 g/cm³).
Second, strength: Titanium alloys (e.g., Ti-6Al-4V) outperform aluminum in tensile strength (1,000 MPa vs. 500 MPa), while carbon fiber composites exceed both.
Third, cost: Aluminum is cheaper (2,500/ton)thantitanium(2,500/ton)thantitanium(30,000/ton) and carbon fiber ($25/kg).
Fourth, manufacturability: Aluminum's ductility allows easy extrusion and welding, unlike brittle carbon fiber.
Fifth, corrosion resistance: Aluminum naturally resists oxidation, whereas titanium excels in extreme environments (e.g., seawater), and carbon fiber degrades under UV exposure. Applications reflect these differences: aerospace uses titanium for engine parts, carbon fiber for wings, and aluminum for fuselages. Aluminum remains dominant in automotive and consumer goods due to its balance of affordability and performance.
