7003 (AlZn6Mg0.8Zr, A97003) Aluminum
7003 aluminum is a 7000-series aluminum alloy: the main alloying addition is zinc and it is formulated for primary forming into wrought products. 7003 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-7003. A97003 is the UNS number. Additionally, the EN chemical designation is AlZn6Mg0,8Zr.
It originally received its standard designation in 1975.
The properties of 7003 aluminum include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 7003 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
11 %
Fatigue Strength
130 to 150 MPa 19 to 22 x 103 psi
Poisson's Ratio
0.32
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
210 to 230 MPa 30 to 34 x 103 psi
Tensile Strength: Ultimate (UTS)
350 to 390 MPa 50 to 56 x 103 psi
Tensile Strength: Yield (Proof)
300 to 310 MPa 43 to 45 x 103 psi
Thermal Properties
Latent Heat of Fusion
380 J/g
Maximum Temperature: Mechanical
200 °C 400 °F
Melting Completion (Liquidus)
630 °C 1170 °F
Melting Onset (Solidus)
510 °C 960 °F
Specific Heat Capacity
870 J/kg-K 0.21 BTU/lb-°F
Thermal Conductivity
150 W/m-K 87 BTU/h-ft-°F
Thermal Expansion
24 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
36 % IACS
Electrical Conductivity: Equal Weight (Specific)
110 % IACS
Otherwise Unclassified Properties
Base Metal Price
9.5 % relative
Density
2.9 g/cm3 180 lb/ft3
Embodied Carbon
8.1 kg CO2/kg material
Embodied Energy
150 MJ/kg 65 x 103 BTU/lb
Embodied Water
1140 L/kg 140 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
37 to 41 MJ/m3
Resilience: Unit (Modulus of Resilience)
630 to 710 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
47 points
Strength to Weight: Axial
33 to 37 points
Strength to Weight: Bending
37 to 40 points
Thermal Diffusivity
59 mm2/s
Thermal Shock Resistance
15 to 17 points
Alloy Composition
Among wrought aluminum alloys, the composition of 7003 aluminum is notable for containing a comparatively high amount of zinc (Zn) and including zirconium (Zr). 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. Zirconium is used to increase an alloy's recrystallization temperature, which increases the temperature at which the alloy can be used without permanent loss of mechanical properties.
| Al | 90.6 to 94.5 | |
| Zn | 5.0 to 6.5 | |
| Mg | 0.5 to 1.0 | |
| Fe | 0 to 0.35 | |
| Mn | 0 to 0.3 | |
| Si | 0 to 0.3 | |
| Zr | 0.050 to 0.25 | |
| Cr | 0 to 0.2 | |
| Ti | 0 to 0.2 | |
| Cu | 0 to 0.2 | |
| res. | 0 to 0.15 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
Handbook of Aluminum Bonding Technology and Data, J. D. Minford, 1993
Handbook of Aluminum vol. 2: Alloy Production and Materials Manufacturing, George Totten and D. Scott MacKenzie (editors), 2003
Aluminum: Properties and Physical Metallurgy, John E. Hatch (editor), 1984
EN 755-2: Aluminium and aluminium alloys. Extruded rod/bar, tube and profiles. Mechanical properties
EN 573-3: Aluminium and aluminium alloys. Chemical composition and form of wrought products. Chemical composition and form of products