7075
ASTM B209 / AlZn5.5MgCu / 7075 / W
| Chemical Properties | % Value |
| Silicon (Si) | 0,00 - 0,40 |
| Chromium (Cr) | 0,18 - 0,28 |
| Manganese (Mn) | 0,00 - 0,30 |
| Magnesium (Mg) | 2,10 - 2,90 |
| Copper (Cu) | 1,20 - 2,00 |
| Titanium (Ti) | 0,00 - 0,20 |
| Iron (Fe) | 0,00 - 0,50 |
| Zinc (Zn) | 5,10 - 6,10 |
| Aluminium (Al) | Balance |
| Physical Properties | Value |
| Density | 2.81 g/cm³ |
| Melting Point | 477°C |
| Thermal Expansion | 24 µm/m.°C |
| Modulus of Elasticity | 71 GPa |
| Thermal Conductivity | 130 W/m.K |
| Electrical Resistivity | %33 IACS |
| Mechanical Properties | Value |
| Proof Strength | 138 Mpa |
| Yield Strength | 331 Mpa |
| Shear Strength | 130 MPa |
| Elongation A50 mm | %12 |
| Hardness | 150 HB |
7075 W aluminum alloy is presented in a solution heat-treated condition but not fully aged (hardened), which means it has not yet reached its final strength. Despite this, it offers improved formability, making it ideal for preliminary stages of production in aerospace, defense, sports equipment, and other high-performance machinery components. This allows the creation of complex geometries, which can later be brought to their desired final properties through subsequent aging treatments.
The alloy’s surface can be anodized, enhancing both its aesthetics and corrosion resistance. While the 7075 series is generally challenging to weld, the W condition, being not fully hardened, may allow limited welding possibilities using appropriate filler metals and careful heat input control. Compared to fully hardened states (such as T6 or T7), bending and forming are relatively easier in the W condition, enabling the production of intricate shapes prior to the final heat treatment.
Though the alloy in the W condition does not yet offer its maximum fatigue strength, it can still maintain structural integrity in environments with high vibration through a planned sequence of heat treatments to achieve the required durability. For instance, it can be used in aircraft fuselages or automotive structural components where fatigue resistance is critical, with final processing steps enhancing its long-term performance. Corrosion resistance can also be improved by proper aging treatments and surface coatings.
Its advantages include better formability before final hardening, the potential for anodizing, and the flexibility of achieving desired strength levels through subsequent treatments. However, in the W condition, the alloy has not attained its maximum strength or fatigue resistance, welding remains somewhat limited, and the manufacturing process depends on appropriate heat treatment sequences. Overall, 7075 W aluminum alloy is an excellent choice for high-performance applications requiring production-stage flexibility coupled with the potential for eventual high-strength performance.
Sheet as; 7075 W, AMS QQ-A-250/12,
ASTM B209
Choosing Factors for 7075 W:
- Strength: Average
- Machining: Normal
- Weldability: Weak
- Formability: High
- Corrosion Resistance: Moderate
- Heat Treating:Yes
- Sheet
| Mechanical Properties | |||
| Thickness (mm) | Proof Strength (Min.) | Yield Strength (Min.) | Elongation A50 mm % |
| Over 6.3 up to & incl. 12.6 | 462 MPa | 538 MPa | %9 |
| Over 12,7 up to & incl. 25,4 | 469 MPa | 538 MPa | %7 |
| Over 25,4 up to & incl. 50,8 | 462 MPa | 531 MPa | %6 |
| Over 50,8 up to & incl. 63,5 | 441 MPa | 524 MPa | %6 |
| Over 63,5 up to & incl. 76,2 | 421 MPa | 496 MPa | %5 |
| Over 76,2 up to & incl. 88,9 | 400 MPa | 490 MPa | %5 |
| Over 88,9 up to & incl. 101,6 | 372 MPa | 462 MPa | %3 |
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