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7178 Aluminum vs. 2218 Aluminum

Both 7178 aluminum and 2218 aluminum are aluminum alloys. They have a moderately high 92% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is 7178 aluminum and the bottom bar is 2218 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
73
Elongation at Break, % 4.5 to 12
6.8 to 10
Fatigue Strength, MPa 120 to 210
110
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 27
27
Shear Strength, MPa 140 to 380
210 to 250
Tensile Strength: Ultimate (UTS), MPa 240 to 640
330 to 430
Tensile Strength: Yield (Proof), MPa 120 to 560
260 to 310

Thermal Properties

Latent Heat of Fusion, J/g 370
390
Maximum Temperature: Mechanical, °C 180
220
Melting Completion (Liquidus), °C 630
640
Melting Onset (Solidus), °C 480
510
Specific Heat Capacity, J/kg-K 860
870
Thermal Conductivity, W/m-K 130
140
Thermal Expansion, µm/m-K 23
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
37
Electrical Conductivity: Equal Weight (Specific), % IACS 91
110

Otherwise Unclassified Properties

Base Metal Price, % relative 10
11
Density, g/cm3 3.1
3.1
Embodied Carbon, kg CO2/kg material 8.2
8.2
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1110
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
27 to 31
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
450 to 650
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
45
Strength to Weight: Axial, points 21 to 58
30 to 39
Strength to Weight: Bending, points 28 to 54
34 to 41
Thermal Diffusivity, mm2/s 47
52
Thermal Shock Resistance, points 10 to 28
15 to 19

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
88.8 to 93.6
Chromium (Cr), % 0.18 to 0.28
0 to 0.1
Copper (Cu), % 1.6 to 2.4
3.5 to 4.5
Iron (Fe), % 0 to 0.5
0 to 1.0
Magnesium (Mg), % 2.4 to 3.1
1.2 to 1.8
Manganese (Mn), % 0 to 0.3
0 to 0.2
Nickel (Ni), % 0
1.7 to 2.3
Silicon (Si), % 0 to 0.4
0 to 0.9
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
0 to 0.25
Residuals, % 0
0 to 0.15