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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.

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