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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.

Aluminum (Al)Al 90.6 to 94.5
Zinc (Zn)Zn 5.0 to 6.5
Magnesium (Mg)Mg 0.5 to 1.0
Iron (Fe)Fe 0 to 0.35
Manganese (Mn)Mn 0 to 0.3
Silicon (Si)Si 0 to 0.3
Zirconium (Zr)Zr 0.050 to 0.25
Chromium (Cr)Cr 0 to 0.2
Titanium (Ti)Ti 0 to 0.2
Copper (Cu)Cu 0 to 0.2
Residualsres. 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