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.
| Al | 85.7 to 89.5 | |
| Zn | 7.2 to 8.2 | |
| Mg | 2.0 to 2.9 | |
| Cu | 1.2 to 1.9 | |
| Fe | 0 to 0.35 | |
| Cr | 0.1 to 0.22 | |
| Si | 0 to 0.25 | |
| Mn | 0 to 0.2 | |
| Ti | 0 to 0.1 | |
| res. | 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