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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 m2/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.

Aluminum (Al) 87.9 to 92.4
Zinc (Zn) 4.3 to 5.2
Magnesium (Mg) 2.6 to 3.7
Copper (Cu) 0.5 to 1.0
Manganese (Mn) 0.1 to 0.4
Silicon (Si) 0 to 0.5
Iron (Fe) 0 to 0.5
Chromium (Cr) 0.1 to 0.3
Titanium (Ti) 0 to 0.2
Zirconium (Zr) 0 to 0.2
Residuals 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