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7049 Aluminum

7049 aluminum is a 7000-series aluminum alloy: the main alloying addition is zinc and it is formulated for primary forming into wrought products. 7049 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-7049. Additionally, the AFNOR (French) designation is A-Z8GU. And the UNS number is A97049.

It originally received its standard designation in 1968.

The properties of 7049 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 7049 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

Brinell Hardness

140

Elastic (Young's, Tensile) Modulus

70 GPa 10 x 106 psi

Elongation at Break

6.2 to 7.0 %

Fatigue Strength

160 to 170 MPa 24 x 103 psi

Poisson's Ratio

0.32

Shear Modulus

27 GPa 3.8 x 106 psi

Shear Strength

300 to 310 MPa 43 to 44 x 103 psi

Tensile Strength: Ultimate (UTS)

510 to 530 MPa 74 to 76 x 103 psi

Tensile Strength: Yield (Proof)

420 to 450 MPa 61 to 65 x 103 psi

Thermal Properties

Latent Heat of Fusion

370 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

860 J/kg-K 0.2 BTU/lb-°F

Thermal Conductivity

130 W/m-K 77 BTU/h-ft-°F

Thermal Expansion

23 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

36 % IACS

Electrical Conductivity: Equal Weight (Specific)

110 % IACS

Otherwise Unclassified Properties

Base Metal Price

10 % relative

Density

3.1 g/cm3 190 lb/ft3

Embodied Carbon

8.1 kg CO2/kg material

Embodied Energy

140 MJ/kg 62 x 103 BTU/lb

Embodied Water

1110 L/kg 130 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

31 to 34 MJ/m3

Resilience: Unit (Modulus of Resilience)

1270 to 1440 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

45 points

Strength to Weight: Axial

46 to 47 points

Strength to Weight: Bending

46 to 47 points

Thermal Diffusivity

51 mm2/s

Thermal Shock Resistance

22 to 23 points

Alloy Composition

Among wrought aluminum alloys, the composition of 7049 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) 85.7 to 89.5
Zinc (Zn) 7.2 to 8.2
Magnesium (Mg) 2.0 to 2.9
Copper (Cu) 1.2 to 1.9
Iron (Fe) 0 to 0.35
Chromium (Cr) 0.1 to 0.22
Silicon (Si) 0 to 0.25
Manganese (Mn) 0 to 0.2
Titanium (Ti) 0 to 0.1
Residuals 0 to 0.15

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

Followup Questions

Similar Alloys

Further Reading

ASTM B247: Standard Specification for Aluminum and Aluminum-Alloy Die Forgings, Hand Forgings, and Rolled Ring Forgings

Aluminum Standards and Data, Aluminum Association Inc., 2013

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993