8090-T81 Aluminum
8090-T81 aluminum is 8090 aluminum in the T81 temper. To achieve this temper, the metal is solution heat-treated, strain hardened by 1%, then artificially aged. It has the second lowest strength and second highest ductility compared to the other variants of 8090 aluminum.
The graph bars on the material properties cards below compare 8090-T81 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
11 %
Fatigue Strength
110 MPa 17 x 103 psi
Fracture Toughness
130 MPa-m1/2 110 x 103 psi-in1/2
Poisson's Ratio
0.33
Shear Modulus
25 GPa 3.7 x 106 psi
Tensile Strength: Ultimate (UTS)
400 MPa 58 x 103 psi
Tensile Strength: Yield (Proof)
320 MPa 47 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 W/m-K 55 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)
41 MJ/m3
Resilience: Unit (Modulus of Resilience)
770 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
50 points
Strength to Weight: Axial
40 points
Strength to Weight: Bending
44 points
Thermal Diffusivity
36 mm2/s
Thermal Shock Resistance
18 points
Alloy Composition
| Al | 93 to 98.4 | |
| Li | 2.2 to 2.7 | |
| Cu | 1.0 to 1.6 | |
| Mg | 0.6 to 1.3 | |
| Fe | 0 to 0.3 | |
| Zn | 0 to 0.25 | |
| Si | 0 to 0.2 | |
| Zr | 0.040 to 0.16 | |
| Mn | 0 to 0.1 | |
| Cr | 0 to 0.1 | |
| Ti | 0 to 0.1 | |
| res. | 0 to 0.15 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
Aluminum-Lithium Alloys: Processing, Properties, and Applications, N. Eswara Prasad et al. (editors), 2013
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