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6018 Aluminum vs. 7178 Aluminum

Both 6018 aluminum and 7178 aluminum are aluminum alloys. They have 90% of their average alloy composition in common.

For each property being compared, the top bar is 6018 aluminum and the bottom bar is 7178 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
71
Elongation at Break, % 9.0 to 9.1
4.5 to 12
Fatigue Strength, MPa 85 to 89
120 to 210
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
27
Shear Strength, MPa 170 to 180
140 to 380
Tensile Strength: Ultimate (UTS), MPa 290 to 300
240 to 640
Tensile Strength: Yield (Proof), MPa 220 to 230
120 to 560

Thermal Properties

Latent Heat of Fusion, J/g 400
370
Maximum Temperature: Mechanical, °C 160
180
Melting Completion (Liquidus), °C 640
630
Melting Onset (Solidus), °C 570
480
Specific Heat Capacity, J/kg-K 890
860
Thermal Conductivity, W/m-K 170
130
Thermal Expansion, µm/m-K 23
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 44
31
Electrical Conductivity: Equal Weight (Specific), % IACS 140
91

Otherwise Unclassified Properties

Base Metal Price, % relative 10
10
Density, g/cm3 2.9
3.1
Embodied Carbon, kg CO2/kg material 8.2
8.2
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1180
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 25
24 to 52
Resilience: Unit (Modulus of Resilience), kJ/m3 360 to 380
110 to 2220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 48
45
Strength to Weight: Axial, points 28 to 29
21 to 58
Strength to Weight: Bending, points 34 to 35
28 to 54
Thermal Diffusivity, mm2/s 65
47
Thermal Shock Resistance, points 13
10 to 28

Alloy Composition

Aluminum (Al), % 93.1 to 97.8
85.4 to 89.5
Bismuth (Bi), % 0.4 to 0.7
0
Chromium (Cr), % 0 to 0.1
0.18 to 0.28
Copper (Cu), % 0.15 to 0.4
1.6 to 2.4
Iron (Fe), % 0 to 0.7
0 to 0.5
Lead (Pb), % 0.4 to 1.2
0
Magnesium (Mg), % 0.6 to 1.2
2.4 to 3.1
Manganese (Mn), % 0.3 to 0.8
0 to 0.3
Silicon (Si), % 0.5 to 1.2
0 to 0.4
Titanium (Ti), % 0 to 0.2
0 to 0.2
Zinc (Zn), % 0 to 0.3
6.3 to 7.3
Residuals, % 0
0 to 0.15

Comparable Variants