7022 (AlZn5Mg3Cu, 3.4345) Aluminum
7022 aluminum is a 7000-series aluminum alloy: the main alloying addition is zinc and it is formulated for primary forming into wrought products. 7022 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-7022. AlZn5Mg3Cu is the EN chemical designation. Additionally, the AFNOR (French) designation is A-Z4GU. And the UNS number is A97022.
It originally received its standard designation in 1979.
It has the lowest electrical conductivity among the 7000-series alloys in the database.
The properties of 7022 aluminum include four 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 7022 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
6.3 to 8.0 %
Fatigue Strength
140 to 170 MPa 20 to 24 x 103 psi
Poisson's Ratio
0.32
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
290 to 320 MPa 42 to 46 x 103 psi
Tensile Strength: Ultimate (UTS)
490 to 540 MPa 71 to 78 x 103 psi
Tensile Strength: Yield (Proof)
390 to 460 MPa 57 to 66 x 103 psi
Thermal Properties
Latent Heat of Fusion
380 J/g
Maximum Temperature: Mechanical
200 °C 390 °F
Melting Completion (Liquidus)
640 °C 1180 °F
Melting Onset (Solidus)
480 °C 890 °F
Specific Heat Capacity
870 J/kg-K 0.21 BTU/lb-°F
Thermal Conductivity
140 W/m-K 80 BTU/h-ft-°F
Thermal Expansion
24 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
21 % IACS
Electrical Conductivity: Equal Weight (Specific)
65 % IACS
Otherwise Unclassified Properties
Base Metal Price
10 % relative
Density
2.9 g/cm3 180 lb/ft3
Embodied Carbon
8.5 kg CO2/kg material
Embodied Energy
150 MJ/kg 65 x 103 BTU/lb
Embodied Water
1130 L/kg 140 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
29 to 40 MJ/m3
Resilience: Unit (Modulus of Resilience)
1100 to 1500 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
47 points
Strength to Weight: Axial
47 to 51 points
Strength to Weight: Bending
47 to 50 points
Thermal Diffusivity
54 mm2/s
Thermal Shock Resistance
21 to 23 points
Alloy Composition
Among wrought aluminum alloys, the composition of 7022 aluminum is notable for containing comparatively high amounts of zinc (Zn) and magnesium (Mg). 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. Magnesium promotes hardenability through both heat treatment and strain hardening mechanisms. It also increases susceptibility to intergranular corrosion.
| Al | 87.9 to 92.4 | |
| Zn | 4.3 to 5.2 | |
| Mg | 2.6 to 3.7 | |
| Cu | 0.5 to 1.0 | |
| Mn | 0.1 to 0.4 | |
| Si | 0 to 0.5 | |
| Fe | 0 to 0.5 | |
| Cr | 0.1 to 0.3 | |
| Ti | 0 to 0.2 | |
| Zr | 0 to 0.2 | |
| 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
EN 755-2: Aluminium and aluminium alloys. Extruded rod/bar, tube and profiles. Mechanical properties
EN 485-2: Aluminium and aluminium alloys. Sheet, strip and plate. Mechanical properties
ASM Specialty Handbook: Aluminum and Aluminum Alloys, J. R. Davis (editor), 1993
ISO 6361-2: Wrought aluminium and aluminium alloys - Sheets, strips and plates - Part 2: Mechanical properties
EN 573-3: Aluminium and aluminium alloys. Chemical composition and form of wrought products. Chemical composition and form of products
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015