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2218 Aluminum vs. 518.0 Aluminum

Both 2218 aluminum and 518.0 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 2218 aluminum and the bottom bar is 518.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 95 to 110
80
Elastic (Young's, Tensile) Modulus, GPa 73
67
Elongation at Break, % 6.8 to 10
5.0
Fatigue Strength, MPa 110
140
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 27
25
Shear Strength, MPa 210 to 250
200
Tensile Strength: Ultimate (UTS), MPa 330 to 430
310
Tensile Strength: Yield (Proof), MPa 260 to 310
190

Thermal Properties

Latent Heat of Fusion, J/g 390
390
Maximum Temperature: Mechanical, °C 220
170
Melting Completion (Liquidus), °C 640
620
Melting Onset (Solidus), °C 510
560
Specific Heat Capacity, J/kg-K 870
900
Thermal Conductivity, W/m-K 140
98
Thermal Expansion, µm/m-K 22
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
24
Electrical Conductivity: Equal Weight (Specific), % IACS 110
81

Otherwise Unclassified Properties

Base Metal Price, % relative 11
9.5
Density, g/cm3 3.1
2.7
Embodied Carbon, kg CO2/kg material 8.2
9.4
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1130
1160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27 to 31
14
Resilience: Unit (Modulus of Resilience), kJ/m3 450 to 650
270
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
51
Strength to Weight: Axial, points 30 to 39
32
Strength to Weight: Bending, points 34 to 41
38
Thermal Diffusivity, mm2/s 52
40
Thermal Shock Resistance, points 15 to 19
14

Alloy Composition

Aluminum (Al), % 88.8 to 93.6
88.1 to 92.5
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 3.5 to 4.5
0 to 0.25
Iron (Fe), % 0 to 1.0
0 to 1.8
Magnesium (Mg), % 1.2 to 1.8
7.5 to 8.5
Manganese (Mn), % 0 to 0.2
0 to 0.35
Nickel (Ni), % 1.7 to 2.3
0 to 0.15
Silicon (Si), % 0 to 0.9
0 to 0.35
Tin (Sn), % 0
0 to 0.15
Zinc (Zn), % 0 to 0.25
0 to 0.15
Residuals, % 0
0 to 0.25