Chemical Composition (EN AW‑7075 / ASTM B209)
| Element |
Weight % |
Key Role |
| Aluminum (Al) |
Remainder |
Base matrix |
| Zinc (Zn) |
5.1 – 6.1 |
Primary strengthening element |
| Magnesium (Mg) |
2.1 – 2.9 |
Forms hardening precipitates |
| Copper (Cu) |
1.2 – 2.0 |
Boosts strength & hardness |
| Chromium (Cr) |
0.18 – 0.28 |
Refines grain & improves toughness |
| Silicon (Si) |
≤ 0.40 |
Controlled impurity |
| Iron (Fe) |
≤ 0.50 |
Controlled impurity |
| Manganese (Mn) |
≤ 0.30 |
Grain control |
| Titanium (Ti) |
≤ 0.20 |
Grain stabilization |
| Others (each) |
≤ 0.05 |
|
| Others (total) |
≤ 0.15 |
|
Core Mechanical Properties (7075‑T6 / T651)
| Property |
7075‑T6 |
7075‑T651 |
Unit |
| Tensile Strength (min) |
540 |
540 |
MPa |
| Yield Strength (0.2% proof, min) |
480 |
480 |
MPa |
| Elongation (min) |
7 |
7 |
% |
| Density |
2.81 |
2.81 |
g/cm³ |
| Fatigue Strength |
~159 |
~160 |
MPa |
| Shear Strength |
~331 |
~331 |
MPa |
Key Characteristics
- Ultra‑high strength – one of the strongest commercial aluminum alloys
- Excellent strength‑to‑weight ratio – ideal for weight‑critical structures
- Good fatigue resistance under cyclic loading
- Very good machinability in T6 / T651 tempers
- Stress relief available (T651) for minimal distortion in CNC machining
- Limited weldability – generally not recommended for structural welding
Typical Applications
- Aerospace structures (wings, fuselage, bulkheads)
- High‑performance automotive components
- Gears, shafts, and structural parts
- Defense and military equipment
- Bicycle frames, climbing gear, and precision parts
- Mold bases and fixture plates
Available Forms
- Plate & sheet
- Extruded bars & rods
- Precision machined components
Why Choose 7075
7075 aluminum alloy delivers steel‑like performance with aluminum light weight, making it irreplaceable in applications where high strength, fatigue life, and dimensional stability are critical. Combined with T6 / T651 tempering, it provides consistent mechanical properties and reliable performance in the most demanding environments.
