An Aluminium Alloy with the Strength of Steel. 7068 alloy is a 7000 series aluminium-zinc alloy registered with the US Aluminium Association and produced to AMS 4331 (chemical composition and mechanical properties) and AMS 2772 (heat treatment). 7068 alloy 'A' and 'B' tensile data and fatigue properties have been ratified for inclusion in MIL Handbook 5 / MMPDS.
Alloy 7068 is typically used for:
Alloy 7068
Spec: AMS 4331
| Chemical Element | % Present |
|---|---|
| Silicon (Si) | 0.0 – 0.12 |
| Iron (Fe) | 0.0 – 0.15 |
| Copper (Cu) | 1.60 – 2.40 |
| Manganese (Mn) | 0.0 – 0.10 |
| Magnesium (Mg) | 2.20 – 3.00 |
| Chromium (Cr) | 0.0 – 0.05 |
| Zinc (Zn) | 7.30 – 8.30 |
| Titanium (Ti) | 0.0 – 0.10 |
| Zirconium (Zr) | 0.05 – 0.15 |
| Others (Each) | 0.0 – 0.05 |
| Others (Total) | 0.0 – 0.15 |
| Aluminium (Al) | Balance |
Alloy 7068
| Property | Value |
|---|---|
| Density | 2.85 kg/dm³ |
| Melting Range | 476 – 635 °C |
| Specific Thermal Capacity at 100°C | 1050 J·kg⁻¹·K⁻¹ |
| Mean Coefficient of Thermal Expansion (20 - 100°C) | 23.4 x 10⁻⁶ / K |
| Thermal Conductivity at 20°C | 190 W·m⁻¹·K⁻¹ |
| Electrical Conductivity at 20°C (T6511) | 31 % IACS |
| Electrical Conductivity at 20°C (T76511) | 39 % IACS |
| Modulus of Elasticity (Young's Modulus) | 73.1 GPa |
Extruded Bar & Forgings
Spec: AMS 4331 / PDF Reference
| Property / Condition | UTS (MPa) | YTS (MPa) | Elongation (%) | Brinell Hardness |
|---|---|---|---|---|
| Minimum Mechanical Properties (AMS 4331) | ||||
| T6 / T6511 (0.25" – 3.00" Section) | 683 | 655 | 5 | - |
| T6 / T6511 (3.001" – 6.500" Section) | 648 | 621 | 5 | - |
| T76 / T76511 (0.25" – 3.00" Section) | 593 | 552 | 7 | - |
| Typical Mechanical Properties | ||||
| Extruded Bar T6511 - L Direction | 710 | 683 | 9 | 190 |
| Extruded Bar T6511 - LT Direction | 645 | 603 | 7 | - |
| Forging T6 - L Direction | 628 | 524 | 10 | 160 |
| Comparative Minimum Data | ||||
| 7068 T6511 (0.25" – 3.00" Section) | 683 | 655 | 5 | - |
| 7150 T6511 (0.80" – 2.40" Section) | 615 | 580 | 8 | - |
| 7075 T6511 (0.50" – 3.00" Section) | 559 | 496 | 7 | - |
| 2014A T6511 (1.00" – 3.00" Section) | 480 | 440 | 7 | - |
| 2618A T6 (0.40" – 4.00" Section) | 420 | 340 | 7 | - |
Temper types for Alloy 7068:
In common with other 7000 series aluminium alloys, 7068 alloy can only be welded with great care. This form of joining is not usually employed. If welding is contemplated please consult our Technical Sales Dept.
Fabrication characteristics of Alloy 7068:
