7020-O Aluminum
7020-O aluminum is 7020 aluminum in the annealed condition. It has the lowest strength compared to the other variants of 7020 aluminum. The graph bars on the material properties cards below compare 7020-O 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
Elastic (Young's, Tensile) Modulus
70 GPa 10 x 106 psi
Elongation at Break
14 %
Fatigue Strength
130 MPa 18 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
110 MPa 17 x 103 psi
Tensile Strength: Ultimate (UTS)
190 MPa 27 x 103 psi
Tensile Strength: Yield (Proof)
120 MPa 18 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 MJ/m3
Resilience: Unit (Modulus of Resilience)
110 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
47 points
Strength to Weight: Axial
18 points
Strength to Weight: Bending
25 points
Thermal Diffusivity
59 mm2/s
Thermal Shock Resistance
8.3 points
Alloy Composition
| 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
Further Reading
Handbook of Aluminum Bonding Technology and Data, J. D. Minford, 1993
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