7020-T651 Aluminum
7020-T651 aluminum is 7020 aluminum in the T651 temper. To achieve this temper, the metal is solution heat-treated, stress relieved, then artificially aged. The stress relief is accomplished by stretching the metal by an amount that depends on the type of standard wrought product being made (sheet, plate, bar, or forging).
It has the second lowest ductility compared to the other variants of 7020 aluminum.
The graph bars on the material properties cards below compare 7020-T651 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
100
Elastic (Young's, Tensile) Modulus
70 GPa 10 x 106 psi
Elongation at Break
8.6 %
Fatigue Strength
110 MPa 16 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
230 MPa 33 x 103 psi
Tensile Strength: Ultimate (UTS)
390 MPa 56 x 103 psi
Tensile Strength: Yield (Proof)
300 MPa 44 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)
31 MJ/m3
Resilience: Unit (Modulus of Resilience)
660 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
47 points
Strength to Weight: Axial
37 points
Strength to Weight: Bending
41 points
Thermal Diffusivity
59 mm2/s
Thermal Shock Resistance
17 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