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.
| Al | 84.6 to 89.5 | |
| Zn | 7.2 to 8.4 | |
| Mg | 2.1 to 3.1 | |
| Cu | 1.2 to 1.9 | |
| Mn | 0 to 0.5 | |
| Fe | 0 to 0.5 | |
| Si | 0 to 0.4 | |
| Cr | 0.050 to 0.25 | |
| Ti | 0 to 0.25 | |
| Zr | 0 to 0.25 | |
| res. | 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