7020 (AlZn4.5Mg1, 3.4335, H17, A97020) Aluminum
7020 aluminum is a 7000-series aluminum alloy: the main alloying addition is zinc and it is formulated for primary forming into wrought products. 7020 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-7020. H17 is the British Standard (BS) designation. A97020 is the UNS number. Additionally, the EN chemical designation is AlZn4,5Mg1. And the AFNOR (French) designation is A-Z5G.
It originally received its standard designation in 1972.
It can have the lowest tensile strength among the 7000-series alloys in the database.
The properties of 7020 aluminum include six 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 7020 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
45 to 100
Elastic (Young's, Tensile) Modulus
70 GPa 10 x 106 psi
Elongation at Break
8.4 to 14 %
Fatigue Strength
110 to 130 MPa 16 to 18 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
110 to 230 MPa 17 to 33 x 103 psi
Tensile Strength: Ultimate (UTS)
190 to 390 MPa 27 to 56 x 103 psi
Tensile Strength: Yield (Proof)
120 to 310 MPa 18 to 45 x 103 psi
Thermal Properties
Latent Heat of Fusion
380 J/g
Maximum Temperature: Mechanical
210 °C 410 °F
Melting Completion (Liquidus)
650 °C 1190 °F
Melting Onset (Solidus)
610 °C 1120 °F
Specific Heat Capacity
880 J/kg-K 0.21 BTU/lb-°F
Thermal Conductivity
150 W/m-K 86 BTU/h-ft-°F
Thermal Expansion
23 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
39 % IACS
Electrical Conductivity: Equal Weight (Specific)
120 % IACS
Otherwise Unclassified Properties
Base Metal Price
9.5 % relative
Density
2.9 g/cm3 180 lb/ft3
Embodied Carbon
8.3 kg CO2/kg material
Embodied Energy
150 MJ/kg 65 x 103 BTU/lb
Embodied Water
1150 L/kg 140 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
23 to 46 MJ/m3
Resilience: Unit (Modulus of Resilience)
110 to 690 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
47 points
Strength to Weight: Axial
18 to 37 points
Strength to Weight: Bending
25 to 41 points
Thermal Diffusivity
59 mm2/s
Thermal Shock Resistance
8.3 to 17 points
Alloy Composition
Among wrought aluminum alloys, the composition of 7020 aluminum is notable for containing a comparatively high amount of zinc (Zn) and including zirconium (Zr). 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. Zirconium is used to increase an alloy's recrystallization temperature, which increases the temperature at which the alloy can be used without permanent loss of mechanical properties.
| Al | 91.2 to 94.8 | |
| Zn | 4.0 to 5.0 | |
| Mg | 1.0 to 1.4 | |
| Mn | 0.050 to 0.5 | |
| Cr | 0.1 to 0.35 | |
| Fe | 0 to 0.4 | |
| Si | 0 to 0.35 | |
| Zr | 0.080 to 0.25 | |
| Ti | 0 to 0.25 | |
| Cu | 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
Handbook of Aluminum Bonding Technology and Data, J. D. Minford, 1993
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