Aluminum 7075-T6; 7075-T651
Material Notes: 7075 aluminum is a very strong metal and is used for structural applications where the strength is paramount. The T7351 temper offers improved resistance to stress-corrosion cracking which is useful for some critical structural parts.
Applications: We have specialized applications for aircraft fittings, gears, shafts, fuse parts, meter and regulating valve components, missile parts, worm gears, keys for aerospace and defense use. Also we offer solutions for bike frames as well as sprockets intended for all-terrain vehicles (ATV).
Specifications for Aluminum 7075-T6; 7075-T651
The following table summarizes the key mechanical, thermal, electrical and process characteristics and constituent element ranges for the material of concern. Significant temperature-dependent, thickness-dependent or treatment-dependent variations are noted wherever relevant.
| Category | Property | Metric | English | Comments |
|---|---|---|---|---|
| Physical Properties | Density | 2.81 g/cc | 0.102 lb/in³ | AA; Typical |
| Mechanical Properties | Hardness (Brinell) | 150 | 150 | AA; Typical; 500 g load; 10 mm ball |
| Hardness (Knoop) | 191 | 191 | Converted from Brinell Hardness Value | |
| Hardness (Rockwell A) | 53.5 | 53.5 | Converted from Brinell Hardness Value | |
| Hardness (Rockwell B) | 87 | 87 | Converted from Brinell Hardness Value | |
| Hardness (Vickers) | 175 | 175 | Converted from Brinell Hardness Value | |
| Tensile Strength (Ultimate) | 572 MPa | 83000 psi | AA; Typical | |
| Tensile Strength (Yield) | 503 MPa | 73000 psi | AA; Typical | |
| Modulus of Elasticity | 71.7 GPa | 10400 ksi | AA; Typical; Average of tension and compression. Compression modulus ~2% higher. | |
| Elongation at Break | 3–70% (depending on spec.) | 3–70% (depending on spec.) | Ranges by thickness and temperature. | |
| Fatigue Strength | 159 MPa | 23000 psi | At 5 × 10⁸ cycles, completely reversed stress; RR Moore machine/specimen. | |
| Fracture Toughness | 16–29 MPa-m½ | 15–26 ksi-in½ | Varies by treatment (T651, plate orientations). | |
| Shear Strength | 331 MPa | 48000 psi | AA; Typical | |
| Poisson’s Ratio | 0.33 | 0.33 | ||
| Machinability | 70% | 70% | On a 0–100 aluminum alloy scale. | |
| Shear Modulus | 26.9 GPa | 3900 ksi | ||
| Electrical Properties | Resistivity | 5.15 µΩ-cm@20°C | 5.15 µΩ-cm@68°F | AA; Typical |
| Thermal Properties | CTE (linear) | 21.6–25.2 µm/m-°C | 12–14 µin/in-°F | Ranges depend on the temperature bands (e.g., -50–300 °C). |
| Thermal Conductivity | 130 W/m-K | 900 BTU-in/h-ft²-°F | At 77 °F; AA typical. | |
| Specific Heat Capacity | 0.960 J/g-°C | 0.229 BTU/lb-°F | ||
| Melting Point | 477–635 °C | 890–1175 °F | AA; Typical range for thick components (≥ 1/4 in). | |
| Processing Properties | Annealing Temp. | 413 °C | 775 °F | |
| Solution Temp. | 466–482 °C | 870–900 °F | ||
| Aging Temp. | 121 °C | 250 °F | ||
| Component Elements | Aluminum (Al) | 87.1–91.4% | 87.1–91.4% | As remainder |
| Chromium (Cr) | 0.18–0.28% | 0.18–0.28% | ||
| Copper (Cu) | 1.2–2.0% | 1.2–2.0% | ||
| Magnesium (Mg) | 2.1–2.9% | 2.1–2.9% | ||
| Zinc (Zn) | 5.1–6.1% | 5.1–6.1% | ||
| Silicon (Si) | ≤ 0.40% | ≤ 0.40% | ||
| Iron (Fe) | ≤ 0.50% | ≤ 0.50% | ||
| Total Other Elements | ≤ 0.15% | ≤ 0.15% | ≤ 0.05% per element. |
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