Aluminum 7075 (Al 7075)
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Basic Properties
| Alloy Type | |
|---|---|
| Designation | Al 7075 |
| Density | 2.81 g/cm³ |
| Melting Point | 477-635°C |
Composition
| Element | Percentage |
|---|
Description
Highest strength aluminum alloy in common use. Heat-treatable with zinc as primary strengthening element. Used where maximum strength-to-weight ratio is required.
| Density | 2.81 g/cm³ |
|---|---|
| Electrical Resistivity | 5.2 μΩ·cm |
| Tensile Strength | 220-570 MPa |
|---|---|
| Yield Strength | 95-505 MPa |
| Elongation | 5-17% |
| Hardness | 60-150 HB |
| Machinability | Good machinability in T6 condition. Free-cutting with proper tooling. Excellent surface finish possible. |
| Melting Point | 477-635°C |
|---|---|
| Thermal Conductivity | 130 W/(m·K) |
| Thermal Expansion | 23.2 × 10⁻⁶/°C |
| Heat Treatment | Solution heat treatment at 480°C, water quench, artificial aging at 120°C for 24 hours (T6 temper) |
| Heat Treatment | Solution heat treatment at 480°C, water quench, artificial aging at 120°C for 24 hours (T6 temper) |
|---|---|
| Corrosion Resistance | Fair to poor corrosion resistance. Susceptible to stress corrosion cracking. Requires protective coating in marine environments. |
Applications
Aircraft structural components, aerospace fittings, gears, shafts, missile components, regulating valve parts, worm gears, keys
History
Developed in 1943 for aircraft applications during WWII. Became standard high-strength aluminum alloy for aerospace.