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7021 Aluminum vs. 7108 Aluminum

Both 7021 aluminum and 7108 aluminum are aluminum alloys. Both are furnished in the T6 temper. They have a very high 99% of their average alloy composition in common.

For each property being compared, the top bar is 7021 aluminum and the bottom bar is 7108 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
69
Elongation at Break, % 9.4
11
Fatigue Strength, MPa 150
120
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 26
26
Shear Strength, MPa 270
210
Tensile Strength: Ultimate (UTS), MPa 460
350
Tensile Strength: Yield (Proof), MPa 390
290

Thermal Properties

Latent Heat of Fusion, J/g 380
380
Maximum Temperature: Mechanical, °C 200
210
Melting Completion (Liquidus), °C 630
630
Melting Onset (Solidus), °C 510
530
Specific Heat Capacity, J/kg-K 870
880
Thermal Conductivity, W/m-K 150
150
Thermal Expansion, µm/m-K 24
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
39
Electrical Conductivity: Equal Weight (Specific), % IACS 120
120

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
9.5
Density, g/cm3 2.9
2.9
Embodied Carbon, kg CO2/kg material 8.3
8.3
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1140
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
38
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
620
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
47
Strength to Weight: Axial, points 44
34
Strength to Weight: Bending, points 45
38
Thermal Diffusivity, mm2/s 59
59
Thermal Shock Resistance, points 20
16

Alloy Composition


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Aluminum (Al), % 90.7 to 93.7
92.4 to 94.7
Chromium (Cr), % 0 to 0.050
0
Copper (Cu), % 0 to 0.25
0 to 0.050
Iron (Fe), % 0 to 0.4
0 to 0.1
Magnesium (Mg), % 1.2 to 1.8
0.7 to 1.4
Manganese (Mn), % 0 to 0.1
0 to 0.050
Silicon (Si), % 0 to 0.25
0 to 0.1
Titanium (Ti), % 0 to 0.1
0 to 0.050
Zinc (Zn), % 5.0 to 6.0
4.5 to 5.5
Zirconium (Zr), % 0.080 to 0.18
0.12 to 0.25
Residuals, % 0 to 0.15
0 to 0.15