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2218 Aluminum vs. 2018 Aluminum

Both 2218 aluminum and 2018 aluminum are aluminum alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is 2218 aluminum and the bottom bar is 2018 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 95 to 110
120
Elastic (Young's, Tensile) Modulus, GPa 73
73
Elongation at Break, % 6.8 to 10
9.6
Fatigue Strength, MPa 110
120
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 27
27
Shear Strength, MPa 210 to 250
270
Tensile Strength: Ultimate (UTS), MPa 330 to 430
420
Tensile Strength: Yield (Proof), MPa 260 to 310
310

Thermal Properties

Latent Heat of Fusion, J/g 390
390
Maximum Temperature: Mechanical, °C 220
220
Melting Completion (Liquidus), °C 640
640
Melting Onset (Solidus), °C 510
510
Specific Heat Capacity, J/kg-K 870
870
Thermal Conductivity, W/m-K 140
150
Thermal Expansion, µm/m-K 22
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
40
Electrical Conductivity: Equal Weight (Specific), % IACS 110
120

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27 to 31
37
Resilience: Unit (Modulus of Resilience), kJ/m3 450 to 650
670
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
45
Strength to Weight: Axial, points 30 to 39
38
Strength to Weight: Bending, points 34 to 41
41
Thermal Diffusivity, mm2/s 52
57
Thermal Shock Resistance, points 15 to 19
19

Alloy Composition

Aluminum (Al), % 88.8 to 93.6
89.7 to 94.4
Chromium (Cr), % 0 to 0.1
0 to 0.1
Copper (Cu), % 3.5 to 4.5
3.5 to 4.5
Iron (Fe), % 0 to 1.0
0 to 1.0
Magnesium (Mg), % 1.2 to 1.8
0.45 to 0.9
Manganese (Mn), % 0 to 0.2
0 to 0.2
Nickel (Ni), % 1.7 to 2.3
1.7 to 2.3
Silicon (Si), % 0 to 0.9
0 to 0.9
Zinc (Zn), % 0 to 0.25
0 to 0.25
Residuals, % 0
0 to 0.15