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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

Aluminum (Al)Al 91.2 to 94.8
Zinc (Zn)Zn 4.0 to 5.0
Magnesium (Mg)Mg 1.0 to 1.4
Manganese (Mn)Mn 0.050 to 0.5
Chromium (Cr)Cr 0.1 to 0.35
Iron (Fe)Fe 0 to 0.4
Silicon (Si)Si 0 to 0.35
Zirconium (Zr)Zr 0.080 to 0.25
Titanium (Ti)Ti 0 to 0.25
Copper (Cu)Cu 0 to 0.2
Residualsres. 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