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8090 Aluminum vs. 7021 Aluminum

Both 8090 aluminum and 7021 aluminum are aluminum alloys. They have a moderately high 94% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is 8090 aluminum and the bottom bar is 7021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 67
69
Elongation at Break, % 3.5 to 13
9.4
Fatigue Strength, MPa 91 to 140
150
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 25
26
Tensile Strength: Ultimate (UTS), MPa 340 to 490
460
Tensile Strength: Yield (Proof), MPa 210 to 420
390

Thermal Properties

Latent Heat of Fusion, J/g 400
380
Maximum Temperature: Mechanical, °C 190
200
Melting Completion (Liquidus), °C 660
630
Melting Onset (Solidus), °C 600
510
Specific Heat Capacity, J/kg-K 960
870
Thermal Conductivity, W/m-K 95 to 160
150
Thermal Expansion, µm/m-K 24
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 20
38
Electrical Conductivity: Equal Weight (Specific), % IACS 66
120

Otherwise Unclassified Properties

Base Metal Price, % relative 18
9.5
Density, g/cm3 2.7
2.9
Embodied Carbon, kg CO2/kg material 8.6
8.3
Embodied Energy, MJ/kg 170
150
Embodied Water, L/kg 1160
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 16 to 41
41
Resilience: Unit (Modulus of Resilience), kJ/m3 340 to 1330
1110
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
47
Strength to Weight: Axial, points 34 to 49
44
Strength to Weight: Bending, points 39 to 50
45
Thermal Diffusivity, mm2/s 36 to 60
59
Thermal Shock Resistance, points 15 to 22
20

Alloy Composition


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Aluminum (Al), % 93 to 98.4
90.7 to 93.7
Chromium (Cr), % 0 to 0.1
0 to 0.050
Copper (Cu), % 1.0 to 1.6
0 to 0.25
Iron (Fe), % 0 to 0.3
0 to 0.4
Lithium (Li), % 2.2 to 2.7
0
Magnesium (Mg), % 0.6 to 1.3
1.2 to 1.8
Manganese (Mn), % 0 to 0.1
0 to 0.1
Silicon (Si), % 0 to 0.2
0 to 0.25
Titanium (Ti), % 0 to 0.1
0 to 0.1
Zinc (Zn), % 0 to 0.25
5.0 to 6.0
Zirconium (Zr), % 0.040 to 0.16
0.080 to 0.18
Residuals, % 0 to 0.15
0 to 0.15