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7021 Aluminum vs. 6008 Aluminum

Both 7021 aluminum and 6008 aluminum are aluminum alloys. They have a moderately high 93% of their average alloy composition in common.

For each property being compared, the top bar is 7021 aluminum and the bottom bar is 6008 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
69
Elongation at Break, % 9.4
9.1 to 17
Fatigue Strength, MPa 150
55 to 88
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 26
26
Shear Strength, MPa 270
120 to 170
Tensile Strength: Ultimate (UTS), MPa 460
200 to 290
Tensile Strength: Yield (Proof), MPa 390
100 to 220

Thermal Properties

Latent Heat of Fusion, J/g 380
410
Maximum Temperature: Mechanical, °C 200
180
Melting Completion (Liquidus), °C 630
640
Melting Onset (Solidus), °C 510
620
Specific Heat Capacity, J/kg-K 870
900
Thermal Conductivity, W/m-K 150
190
Thermal Expansion, µm/m-K 24
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
49
Electrical Conductivity: Equal Weight (Specific), % IACS 120
160

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
9.5
Density, g/cm3 2.9
2.7
Embodied Carbon, kg CO2/kg material 8.3
8.5
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1140
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
24 to 28
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
76 to 360
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
50
Strength to Weight: Axial, points 44
21 to 29
Strength to Weight: Bending, points 45
28 to 35
Thermal Diffusivity, mm2/s 59
77
Thermal Shock Resistance, points 20
9.0 to 13

Alloy Composition


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Aluminum (Al), % 90.7 to 93.7
96.5 to 99.1
Chromium (Cr), % 0 to 0.050
0 to 0.3
Copper (Cu), % 0 to 0.25
0 to 0.3
Iron (Fe), % 0 to 0.4
0 to 0.35
Magnesium (Mg), % 1.2 to 1.8
0.4 to 0.7
Manganese (Mn), % 0 to 0.1
0 to 0.3
Silicon (Si), % 0 to 0.25
0.5 to 0.9
Titanium (Ti), % 0 to 0.1
0 to 0.1
Vanadium (V), % 0
0.050 to 0.2
Zinc (Zn), % 5.0 to 6.0
0 to 0.2
Zirconium (Zr), % 0.080 to 0.18
0
Residuals, % 0 to 0.15
0 to 0.15