7475 (AlZn5.5MgCu(A)) Aluminum
7475 aluminum is a 7000-series aluminum alloy: the main alloying addition is zinc and it is formulated for primary forming into wrought products. 7475 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-7475. Additionally, the EN chemical designation is AlZn5,5MgCu(A). And the UNS number is A97475.
It originally received its standard designation in 1969.
The properties of 7475 aluminum include six common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 7475 aluminum to: 7000-series alloys (top), all aluminum alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
70 GPa 10 x 106 psi
Elongation at Break
10 to 12 %
Fatigue Strength
190 to 210 MPa 28 to 31 x 103 psi
Poisson's Ratio
0.32
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
320 to 350 MPa 46 to 51 x 103 psi
Tensile Strength: Ultimate (UTS)
530 to 590 MPa 76 to 85 x 103 psi
Tensile Strength: Yield (Proof)
440 to 520 MPa 64 to 75 x 103 psi
Thermal Properties
Latent Heat of Fusion
380 J/g
Maximum Temperature: Mechanical
180 °C 350 °F
Melting Completion (Liquidus)
640 °C 1180 °F
Melting Onset (Solidus)
480 °C 890 °F
Specific Heat Capacity
870 J/kg-K 0.21 BTU/lb-°F
Thermal Conductivity
140 to 160 W/m-K 80 to 94 BTU/h-ft-°F
Thermal Expansion
23 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
33 to 42 % IACS
Electrical Conductivity: Equal Weight (Specific)
98 to 120 % IACS
Otherwise Unclassified Properties
Base Metal Price
10 % relative
Density
3.0 g/cm3 190 lb/ft3
Embodied Carbon
8.2 kg CO2/kg material
Embodied Energy
150 MJ/kg 63 x 103 BTU/lb
Embodied Water
1130 L/kg 130 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
53 to 68 MJ/m3
Resilience: Unit (Modulus of Resilience)
1390 to 1920 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
46 points
Strength to Weight: Axial
49 to 55 points
Strength to Weight: Bending
48 to 52 points
Thermal Diffusivity
53 to 63 mm2/s
Thermal Shock Resistance
23 to 26 points
Alloy Composition
Among wrought aluminum alloys, the composition of 7475 aluminum is notable for containing comparatively high amounts of zinc (Zn) and copper (Cu). Zinc is used to achieve significant increases in strength, at the cost of increased susceptibility to stress corrosion cracking. Among other things, this limits weldability. Copper is used to improve strength. This comes at the cost of a decrease in corrosion resistance and weldability.
| Al | 88.6 to 91.6 | |
| Zn | 5.1 to 6.2 | |
| Mg | 1.9 to 2.6 | |
| Cu | 1.2 to 1.9 | |
| Cr | 0.18 to 0.25 | |
| Fe | 0 to 0.12 | |
| Si | 0 to 0.1 | |
| Mn | 0 to 0.060 | |
| Ti | 0 to 0.060 | |
| res. | 0 to 0.15 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
Aluminum Standards and Data, Aluminum Association Inc., 2013
ASM Specialty Handbook: Aluminum and Aluminum Alloys, J. R. Davis (editor), 1993
ISO 6361-2: Wrought aluminium and aluminium alloys - Sheets, strips and plates - Part 2: Mechanical properties
EN 573-3: Aluminium and aluminium alloys. Chemical composition and form of wrought products. Chemical composition and form of products