Aluminum alloy is a material based on aluminum, with alloying elements such as copper, magnesium, silicon, and zinc added (usually 5%-15%). Pure aluminum is soft and low in strength, but after alloying, its performance has achieved a qualitative leap—it retains aluminum’s low density (about 2.7g/cm³, only 1/3 of steel) while significantly improving strength, hardness, and corrosion resistance, earning it the title of "light yet strong."
- Lightweight advantage: Compared to steel, it can reduce weight by 30%-50% at the same strength, making it key to energy conservation in aviation, automotive, and other fields.
- Corrosion resistance: A dense oxide film (Al₂O₃) easily forms on the surface, naturally resisting rust. Some grades (e.g., 5xxx, 6xxx series) have better weather resistance after anodizing.
- Workability: It can be formed into complex shapes via casting, forging, extrusion, etc., with good welding and cutting performance, suitable for mass production.
- Recyclability: The recycling rate exceeds 95%, and the energy consumption for recycling is only 5% of primary aluminum production, making it a typical green material.
- 1xxx series (pure aluminum): Over 99% aluminum content, excellent plasticity, used in aluminum foil and wires.
- 2xxx series (aluminum-copper alloy): High strength, used in aerospace parts (e.g., aircraft skins).
- 5xxx series (aluminum-magnesium alloy): Strong corrosion resistance, suitable for marine environments (e.g., ship components, beverage cans).
- 6xxx series (aluminum-magnesium-silicon alloy): Excellent comprehensive performance, widely used in building profiles, automotive frames, and electronic casings.
- 7xxx series (aluminum-zinc-magnesium alloy): Ultra-high strength, used in aerospace vehicles and high-end sports equipment (e.g., bicycle frames).
With the growing demand for new energy and lightweighting, aluminum alloys are developing toward "higher strength, thinner walls, and better corrosion resistance." For example, "aluminum-lithium alloys" in aviation further reduce density, while "hot-formed aluminum alloys" in automotive improve crash safety, allowing this "lightweight 强者" to replace traditional materials in more fields.
