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7049A (AlZn8MgCu) Aluminum

7049A aluminum is a 7000-series aluminum alloy: the main alloying addition is zinc and it is formulated for primary forming into wrought products. 7049A is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-7049A. AlZn8MgCu is the EN chemical designation.

It originally received its standard designation in 1972.

It has the lowest melting temperature among the 7000-series alloys in the database.

The properties of 7049A aluminum include three 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 7049A 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

71 GPa 10 x 106 psi

Elongation at Break

5.0 to 5.7 %

Fatigue Strength

180 MPa 26 x 103 psi

Poisson's Ratio

0.32

Shear Modulus

27 GPa 3.9 x 106 psi

Shear Strength

340 to 350 MPa 49 to 50 x 103 psi

Tensile Strength: Ultimate (UTS)

580 to 590 MPa 84 to 86 x 103 psi

Tensile Strength: Yield (Proof)

500 to 530 MPa 73 to 77 x 103 psi

Thermal Properties

Latent Heat of Fusion

370 J/g

Maximum Temperature: Mechanical

200 °C 390 °F

Melting Completion (Liquidus)

640 °C 1180 °F

Melting Onset (Solidus)

430 °C 800 °F

Specific Heat Capacity

850 J/kg-K 0.2 BTU/lb-°F

Thermal Conductivity

130 W/m-K 76 BTU/h-ft-°F

Thermal Expansion

24 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

40 % IACS

Electrical Conductivity: Equal Weight (Specific)

120 % IACS

Otherwise Unclassified Properties

Base Metal Price

10 % relative

Density

3.1 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

1100 L/kg 130 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

28 to 32 MJ/m3

Resilience: Unit (Modulus of Resilience)

1800 to 1990 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

44 points

Strength to Weight: Axial

52 to 53 points

Strength to Weight: Bending

50 to 51 points

Thermal Diffusivity

50 mm2/s

Thermal Shock Resistance

25 points

Alloy Composition

Among wrought aluminum alloys, the composition of 7049A 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.

Aluminum (Al) 84.6 to 89.5
Zinc (Zn) 7.2 to 8.4
Magnesium (Mg) 2.1 to 3.1
Copper (Cu) 1.2 to 1.9
Manganese (Mn) 0 to 0.5
Iron (Fe) 0 to 0.5
Silicon (Si) 0 to 0.4
Chromium (Cr) 0.050 to 0.25
Titanium (Ti) 0 to 0.25
Zirconium (Zr) 0 to 0.25
Residuals 0 to 0.15

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

EN 754-2: Aluminium and aluminium alloys. Cold drawn rod/bar and tube. Mechanical properties

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

ASM Specialty Handbook: Aluminum and Aluminum Alloys, J. R. Davis (editor), 1993

EN 573-3: Aluminium and aluminium alloys. Chemical composition and form of wrought products. Chemical composition and form of products