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8090 (AlLi2.5Cu1.5Mg1) Aluminum

8090 aluminum is an otherwise-unclassified alloy of aluminum. 8090 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-8090. Additionally, the EN chemical designation is AlLi2,5Cu1,5Mg1. And the UNS number is A98090.

It has been in use since 1980, but has only received its standard designation in 1984.

It has the lowest electrical conductivity among otherwise unclassified aluminums. In addition, it can have the highest tensile strength and the lowest thermal conductivity.

The properties of 8090 aluminum include eight 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 8090 aluminum to: otherwise unclassified aluminums (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

67 GPa 9.8 x 106 psi

Elongation at Break

3.5 to 13 %

Fatigue Strength

91 to 140 MPa 13 to 21 x 103 psi

Fracture Toughness

23 to 130 MPa-m1/2 20 to 110 x 103 psi-in1/2

Poisson's Ratio

0.33

Shear Modulus

25 GPa 3.7 x 106 psi

Tensile Strength: Ultimate (UTS)

340 to 490 MPa 49 to 70 x 103 psi

Tensile Strength: Yield (Proof)

210 to 420 MPa 31 to 61 x 103 psi

Thermal Properties

Latent Heat of Fusion

400 J/g

Maximum Temperature: Mechanical

190 °C 380 °F

Melting Completion (Liquidus)

660 °C 1210 °F

Melting Onset (Solidus)

600 °C 1110 °F

Specific Heat Capacity

960 J/kg-K 0.23 BTU/lb-°F

Thermal Conductivity

95 to 160 W/m-K 55 to 91 BTU/h-ft-°F

Thermal Expansion

24 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

20 % IACS

Electrical Conductivity: Equal Weight (Specific)

66 % IACS

Otherwise Unclassified Properties

Base Metal Price

18 % relative

Density

2.7 g/cm3 170 lb/ft3

Embodied Carbon

8.6 kg CO2/kg material

Embodied Energy

170 MJ/kg 72 x 103 BTU/lb

Embodied Water

1160 L/kg 140 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

16 to 41 MJ/m3

Resilience: Unit (Modulus of Resilience)

340 to 1330 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

50 points

Strength to Weight: Axial

34 to 49 points

Strength to Weight: Bending

39 to 50 points

Thermal Diffusivity

36 to 60 mm2/s

Thermal Shock Resistance

15 to 22 points

Alloy Composition

Aluminum (Al) 93 to 98.4
Lithium (Li) 2.2 to 2.7
Copper (Cu) 1.0 to 1.6
Magnesium (Mg) 0.6 to 1.3
Iron (Fe) 0 to 0.3
Zinc (Zn) 0 to 0.25
Silicon (Si) 0 to 0.2
Zirconium (Zr) 0.040 to 0.16
Manganese (Mn) 0 to 0.1
Chromium (Cr) 0 to 0.1
Titanium (Ti) 0 to 0.1
Residuals 0 to 0.15

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

Aluminum-Lithium Alloys: Processing, Properties, and Applications, N. Eswara Prasad et al. (editors), 2013

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

EN 573-3: Aluminium and aluminium alloys. Chemical composition and form of wrought products. Chemical composition and form of products

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993