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7021 Aluminum vs. 7108A Aluminum

Both 7021 aluminum and 7108A aluminum are aluminum alloys. Their average alloy composition is basically identical.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
69
Elongation at Break, % 9.4
11 to 13
Fatigue Strength, MPa 150
120 to 130
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 to 300

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
520
Specific Heat Capacity, J/kg-K 870
870
Thermal Conductivity, W/m-K 150
150
Thermal Expansion, µm/m-K 24
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
36
Electrical Conductivity: Equal Weight (Specific), % IACS 120
110

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
10
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 to 44
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
610 to 640
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
47
Strength to Weight: Axial, points 44
33 to 34
Strength to Weight: Bending, points 45
38
Thermal Diffusivity, mm2/s 59
59
Thermal Shock Resistance, points 20
15 to 16

Alloy Composition

Aluminum (Al), % 90.7 to 93.7
91.6 to 94.4
Chromium (Cr), % 0 to 0.050
0 to 0.040
Copper (Cu), % 0 to 0.25
0 to 0.050
Gallium (Ga), % 0
0 to 0.030
Iron (Fe), % 0 to 0.4
0 to 0.3
Magnesium (Mg), % 1.2 to 1.8
0.7 to 1.5
Manganese (Mn), % 0 to 0.1
0 to 0.050
Silicon (Si), % 0 to 0.25
0 to 0.2
Titanium (Ti), % 0 to 0.1
0 to 0.030
Zinc (Zn), % 5.0 to 6.0
4.8 to 5.8
Zirconium (Zr), % 0.080 to 0.18
0.15 to 0.25
Residuals, % 0
0 to 0.15