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7021 Aluminum vs. 6018 Aluminum

Both 7021 aluminum and 6018 aluminum are aluminum alloys. They have a moderately high 94% of their average alloy composition in common.

For each property being compared, the top bar is 7021 aluminum and the bottom bar is 6018 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
69
Elongation at Break, % 9.4
9.0 to 9.1
Fatigue Strength, MPa 150
85 to 89
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 26
26
Shear Strength, MPa 270
170 to 180
Tensile Strength: Ultimate (UTS), MPa 460
290 to 300
Tensile Strength: Yield (Proof), MPa 390
220 to 230

Thermal Properties

Latent Heat of Fusion, J/g 380
400
Maximum Temperature: Mechanical, °C 200
160
Melting Completion (Liquidus), °C 630
640
Melting Onset (Solidus), °C 510
570
Specific Heat Capacity, J/kg-K 870
890
Thermal Conductivity, W/m-K 150
170
Thermal Expansion, µm/m-K 24
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
44
Electrical Conductivity: Equal Weight (Specific), % IACS 120
140

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
8.2
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1140
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
24 to 25
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
360 to 380
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
48
Strength to Weight: Axial, points 44
28 to 29
Strength to Weight: Bending, points 45
34 to 35
Thermal Diffusivity, mm2/s 59
65
Thermal Shock Resistance, points 20
13

Alloy Composition


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Aluminum (Al), % 90.7 to 93.7
93.1 to 97.8
Bismuth (Bi), % 0
0.4 to 0.7
Chromium (Cr), % 0 to 0.050
0 to 0.1
Copper (Cu), % 0 to 0.25
0.15 to 0.4
Iron (Fe), % 0 to 0.4
0 to 0.7
Lead (Pb), % 0
0.4 to 1.2
Magnesium (Mg), % 1.2 to 1.8
0.6 to 1.2
Manganese (Mn), % 0 to 0.1
0.3 to 0.8
Silicon (Si), % 0 to 0.25
0.5 to 1.2
Titanium (Ti), % 0 to 0.1
0 to 0.2
Zinc (Zn), % 5.0 to 6.0
0 to 0.3
Zirconium (Zr), % 0.080 to 0.18
0
Residuals, % 0 to 0.15
0 to 0.15