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Aluminum Alloy 7075 sheet
Aluminum Alloy 7075 is a high-strength material widely used in aerospace and structural applications. It contains approximately 5.6–6.1% zinc, 2.1–2.5% magnesium, and 1.2–1.6% copper, with small amounts of silicon, iron, manganese, titanium, and other elements. The alloy is available in various tempers, such as 7075-0, 7075-T6, and 7075-T651, each offering different mechanical properties depending on the application.
As a zinc-based aluminum alloy, 7075 provides excellent strength, toughness, and fatigue resistance. However, due to microsegregation, it can be more brittle than other alloys. Despite this, it offers better corrosion resistance compared to 2000 series alloys. Its high strength-to-weight ratio makes it ideal for critical components in aircraft and other high-stress environments.
The T6 temper of 7075 has an ultimate tensile strength ranging from 510–540 MPa (74,000–78,000 psi) and a yield strength of at least 430–480 MPa (63,000–69,000 psi), with elongation between 5–11%. This temper is achieved through solution heat treatment, quenching, and aging at 120°C for 24 hours, which creates fine precipitates that enhance its strength.
For the T651 temper, the ultimate tensile strength reaches 570 MPa (83,000 psi), with a yield strength of 500 MPa (73,000 psi) and elongation of 3–9%. The T651 process involves stress relief by stretching the material, making it suitable for thicker sections and reducing internal stresses.
Below is a table showing the mechanical properties of 7075 sheets in different tempers and thicknesses:
| Material | Temper | Thickness (in) | Tensile Strength (ksi) | Yield Strength (ksi) | Elongation (%) |
|----------|--------|----------------|-------------------------|----------------------|----------------|
| Alloy 7075 Sheet | T6 Bare | 0.125 - 0.25 | 78 | 69 | 8 |
| Alloy 7075 Sheet | T651 Bare | 0.25 - 0.50 | 78 | 67 | 9 |
| Alloy 7075 Sheet | T651 Bare | 0.5 - 1.0 | 78 | 68 | 7 |
| Alloy 7075 Sheet | T6 Clad | 0.188 - 0.25 | 75 | 64 | 8 |
| Alloy 7075 Sheet | T651 Clad | 0.25 - 0.50 | 75 | 65 | 9 |
| Alloy 7075 Sheet | T651 Clad | 0.5 - 1.00 | 78 | 68 | 7 |
In terms of physical properties, 7075 has a nominal density of 0.101 lbs./in³ (2.80 Mg/m³) at 68°F. Its melting range is between 990°F and 1175°F (532°C to 635°C), and its specific heat capacity is 0.23 BTU/lb-°F (960 J/kg-°K) at 212°F. These characteristics make it a versatile choice for engineering applications requiring both strength and durability.
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Aluminum Alloy 7075 sheet