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2018 Aluminum vs. 2218 Aluminum

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

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

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
95 to 110
Elastic (Young's, Tensile) Modulus, GPa 73
73
Elongation at Break, % 9.6
6.8 to 10
Fatigue Strength, MPa 120
110
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 27
27
Shear Strength, MPa 270
210 to 250
Tensile Strength: Ultimate (UTS), MPa 420
330 to 430
Tensile Strength: Yield (Proof), MPa 310
260 to 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 150
140
Thermal Expansion, µm/m-K 22
22

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

Aluminum (Al), % 89.7 to 94.4
88.8 to 93.6
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), % 0.45 to 0.9
1.2 to 1.8
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 to 0.15
0 to 0.15