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2218 Aluminum vs. 8021 Aluminum

Both 2218 aluminum and 8021 aluminum are aluminum alloys. They have a moderately high 92% 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 2218 aluminum and the bottom bar is 8021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
70
Elongation at Break, % 6.8 to 10
2.3
Fatigue Strength, MPa 110
61
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 27
26
Tensile Strength: Ultimate (UTS), MPa 330 to 430
160
Tensile Strength: Yield (Proof), MPa 260 to 310
130

Thermal Properties

Latent Heat of Fusion, J/g 390
400
Maximum Temperature: Mechanical, °C 220
170
Melting Completion (Liquidus), °C 640
650
Melting Onset (Solidus), °C 510
640
Specific Heat Capacity, J/kg-K 870
900
Thermal Conductivity, W/m-K 140
220
Thermal Expansion, µm/m-K 22
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
56
Electrical Conductivity: Equal Weight (Specific), % IACS 110
180

Otherwise Unclassified Properties

Base Metal Price, % relative 11
9.0
Density, g/cm3 3.1
2.8
Embodied Carbon, kg CO2/kg material 8.2
8.1
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1130
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27 to 31
3.4
Resilience: Unit (Modulus of Resilience), kJ/m3 450 to 650
130
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
49
Strength to Weight: Axial, points 30 to 39
16
Strength to Weight: Bending, points 34 to 41
23
Thermal Diffusivity, mm2/s 52
88
Thermal Shock Resistance, points 15 to 19
7.0

Alloy Composition

Aluminum (Al), % 88.8 to 93.6
98 to 98.8
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 3.5 to 4.5
0 to 0.050
Iron (Fe), % 0 to 1.0
1.2 to 1.7
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.2
0
Nickel (Ni), % 1.7 to 2.3
0
Silicon (Si), % 0 to 0.9
0 to 0.15
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0
0 to 0.15