7475 T7651 Aluminum Plate
7475 aluminum alloy is a high-strength, ultra-pure aluminum-zinc-magnesium-copper alloy with excellent strength and toughness. Its core feature is significantly enhanced exfoliation corrosion resistance. Through specific heat treatments and processing techniques, the T7651 temper of 7475 further optimizes corrosion resistance and structural stability, making it particularly suitable for applications requiring high corrosion resistance and reliable mechanical performance.
Although the strength of 7475 T7651 ranks second lowest among the various tempers of 7475 aluminum, its performance still meets the requirements of most high-stress environments. The greatest advantage of this temper is its balance between strength and corrosion resistance.
Advantages of 7475 T7651 Aluminum Plate
- Exceptional exfoliation corrosion resistance: Optimized through the T7651 tempering process, making it particularly suitable for high-humidity, marine environments, and other harsh corrosive conditions.
- Excellent dimensional stability: Stress-relief stretching imparts outstanding resistance to deformation, suitable for machining complex aerospace components.
- Balanced strength and toughness: While the strength is slightly lower than T6 or T651 tempers, its comprehensive mechanical properties and long-term service reliability are superior.
7475 T7651 Alloy Designations
Alloy Designation | Specification | Description |
7475 T7651 (AMS 4089) | Plate | High-strength aluminum alloy for aerospace structures |
7475 T7651 (AIR 9048-730) | Plate | European aerospace standard, similar to AMS 4089 |
7475 T7651 (EN 2805) | Plate | European EN standard related to 7475 aerospace applications |
7475 T7651 (AMS 4085) | Extrusions | High-strength aerospace extrusion material |
UNS A97475 (AlZn5.5MgCu) | Chemical composition | International naming system reflecting compositional ratios |
Performance Characteristics of 7475 T7651 Aluminum
The performance attributes of 7475 T7651 aluminum alloy are presented in the table below:
Performance Attribute | Description |
Strength | Excellent |
Machinability | Very good |
Weldability | Low |
Formability | Poor |
Corrosion Resistance | Average |
Heat Treatability | Yes |
- Machinability: 7475 T7651 aluminum has excellent machinability but requires sharp tools during cutting to minimize stress concentration and maintain its corrosion resistance.
- Weldability: The welding performance is average and generally not recommended. Mechanical joining methods are advised to preserve the integrity of the material's properties.
- Surface Treatment: Can undergo anodizing, electroplating, and other surface treatments to further enhance corrosion resistance and improve aesthetic quality.
7475 T7651 Aluminum Processing
To achieve the T7651 temper, 7475 aluminum undergoes the following processing steps:
- Solution Heat Treatment: The alloy is heated to an appropriate temperature to form a uniform solid solution, enhancing the base material's properties and toughness for subsequent processing.
- Stress Relieving Stretching: A certain amount of stretching (typically in the range of 1-3%) effectively reduces internal stress and improves dimensional stability and resistance to deformation.
- Artificial Overaging (T7 Series Treatment): Controlled temperature and time are applied to achieve overaging, stabilizing the alloy's structure, significantly improving exfoliation corrosion resistance while maintaining excellent toughness.
7475 T7651 Aluminum Material Data Sheet
7475 T7651 Aluminum Physical Properties | Metric | English | Comments |
Density | 2.81 g/cc | 0.102 lb/in³ | AA; Typical |
7475 T7651 Aluminum Mechanical Properties | |||
Hardness, Brinell | 140 | 140 | 500 kg load with 10 mm ball. Calculated value. |
Hardness, Knoop | 177 | 177 | Converted from Brinell Hardness Value |
Hardness, Rockwell A | 51.6 | 51.6 | Converted from Brinell Hardness Value |
Hardness, Rockwell B | 84 | 84 | Converted from Brinell Hardness Value |
Hardness, Vickers | 162 | 162 | Converted from Brinell Hardness Value |
Ultimate Tensile Strength | 531 MPa | 77000 psi | AA; Typical |
Tensile Yield Strength | 462 MPa | 67000 psi | AA; Typical |
Elongation at Break | 12 % | 12 % | AA; Typical; 1/2 in. (12.7 mm) Diameter |
Modulus of Elasticity | 71.7 GPa | 10400 ksi | AA; Typical; Average of tension and compression. Compression modulus is about 2% greater than tensile modulus. |
Poisson's Ratio | 0.33 | 0.33 | |
Machinability | 70 % | 70 % | 0-100 Scale of Aluminum Alloys |
Shear Modulus | 27 GPa | 3920 ksi | |
Shear Strength | 310 MPa | 45000 psi | Calculated value. |
7475 T7651 Aluminum Electrical Properties | |||
Electrical Resistivity | 4.31e-006 ohm-cm | 4.31e-006 ohm-cm | |
7475 T7651 AluminumThermal Properties | |||
CTE, linear 68°F | 23.2 µm/m-°C | 12.9 µin/in-°F | AA; Typical; Average over 68-212°F range. |
CTE, linear 250°C | 25.2 µm/m-°C | 14 µin/in-°F | Average over the range 20-300ºC |
Specific Heat Capacity | 0.88 J/g-°C | 0.21 BTU/lb-°F | Estimated from trends in similar Al alloys. |
Thermal Conductivity | 163 W/m-K | 1130 BTU-in/hr-ft²-°F | |
Melting Point | 477 - 635 °C | 890 - 1175 °F | AA; Typical range based on typical composition for wrought products 1/4 inch thickness or greater |
Solidus | 477 °C | 890 °F | AA; Typical |
Liquidus | 635 °C | 1175 °F | AA; Typical |
7475 T7651 Aluminum Processing Properties | |||
Annealing Temperature | 413 °C | 775 °F | |
Solution Temperature | 516 °C | 960 °F | must be preceded by soak at 870 to 890°F |
Aging Temperature | 121 - 177 °C | 250 - 350 °F |
7475 T7651 Aluminum Chemical Composition
Chemical Composition Limits (WT %) | |
Silicon | 0.10 |
Iron | 0.12 |
Copper | 1.2-1.9 |
Manganese | 0.06 |
Magnesium | 1.9-2.6 |
Chromium | 0.18-0.25 |
Zinc | 5.2-6.2 |
Titanium | 0.06 |
Others, each | 0.05 |
Others, total | 0.15 |
Balance, Aluminum |
7475 T7651 Aluminum Applications
7475 T7651 aluminum alloy is widely used in aerospace and defense industries for high-demand structural components, especially in scenarios requiring excellent corrosion resistance and toughness. Typical applications include:
- Aircraft structural components: such as wing spars, wing skins, and fuselage frames.
- Defense equipment: tank armor components, missile casings, and more.
- Molds and tools: high-precision molds used in corrosive environments.
7475 T7651 aluminum is also used in jet aircraft, energy production systems, petrochemical plants, and raw material extraction facilities.
7475 T7651 aluminum alloy is a high-performance material with remarkable exfoliation corrosion resistance, making it suitable for extreme and demanding environmental conditions such as those in aerospace.