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7075 (AlZn5.5MgCu, 3.4365, 2L95, A97075) Aluminum

7075 aluminum is a 7000-series aluminum alloy: the main alloying addition is zinc and it is formulated for primary forming into wrought products. 7075 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-7075. 2L95 is the British Standard (BS) designation. A97075 is the UNS number. Additionally, the EN chemical designation is AlZn5,5MgCu. And the AFNOR (French) designation is A-Z5GU.

It has been in use since 1943, but has only received its standard designation in 1954. This material is well established: the Further Reading section below cites a number of published standards, and that list is not necessarily exhaustive.

It can have the lowest ductility among the 7000-series alloys in the database.

The properties of 7075 aluminum include 17 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 7075 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

1.8 to 12 %

Fatigue Strength

110 to 190 MPa 16 to 28 x 103 psi

Poisson's Ratio

0.32

Shear Modulus

26 GPa 3.8 x 106 psi

Shear Strength

150 to 340 MPa 22 to 49 x 103 psi

Tensile Strength: Ultimate (UTS)

240 to 590 MPa 35 to 85 x 103 psi

Tensile Strength: Yield (Proof)

120 to 510 MPa 18 to 74 x 103 psi

Thermal Properties

Latent Heat of Fusion

380 J/g

Maximum Temperature: Mechanical

200 °C 400 °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

130 W/m-K 75 BTU/h-ft-°F

Thermal Expansion

23 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

33 % IACS

Electrical Conductivity: Equal Weight (Specific)

98 % IACS

Otherwise Unclassified Properties

Base Metal Price

10 % relative

Calomel Potential

-750 mV

Density

3.0 g/cm3 190 lb/ft3

Embodied Carbon

8.3 kg CO2/kg material

Embodied Energy

150 MJ/kg 64 x 103 BTU/lb

Embodied Water

1120 L/kg 130 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

7.8 to 44 MJ/m3

Resilience: Unit (Modulus of Resilience)

110 to 1870 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

46 points

Strength to Weight: Axial

22 to 54 points

Strength to Weight: Bending

28 to 52 points

Thermal Diffusivity

50 m2/s

Thermal Shock Resistance

10 to 25 points

Alloy Composition

Among wrought aluminum alloys, the composition of 7075 aluminum is notable for containing comparatively high amounts of zinc (Zn) and copper (Cu). 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. Copper is used to improve strength. This comes at the cost of a decrease in corrosion resistance and weldability.

Aluminum (Al) 86.9 to 91.4
Zinc (Zn) 5.1 to 6.1
Magnesium (Mg) 2.1 to 2.9
Copper (Cu) 1.2 to 2.0
Iron (Fe) 0 to 0.5
Chromium (Cr) 0.18 to 0.28
Silicon (Si) 0 to 0.4
Manganese (Mn) 0 to 0.3
Zirconium (Zr) 0 to 0.25
Titanium (Ti) 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 586-2: Aluminium and aluminium alloys. Forgings. Mechanical properties and additional property requirements.

ASTM B247: Standard Specification for Aluminum and Aluminum-Alloy Die Forgings, Hand Forgings, and Rolled Ring Forgings

ASTM B210: Standard Specification for Aluminum and Aluminum-Alloy Drawn Seamless Tubes

ASTM B211: Standard Specification for Aluminum and Aluminum-Alloy Bar, Rod, and Wire

ASTM B221: Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes

Environmental Degradation of Advanced and Traditional Engineering Materials, Lloyd H. Hihara et al., 2014.

EN 754-2: Aluminium and aluminium alloys. Cold drawn rod/bar and tube. Mechanical properties

ASTM B209: Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate

Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011

EN 755-2: Aluminium and aluminium alloys. Extruded rod/bar, tube and profiles. Mechanical properties