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6081 Aluminum vs. 7178 Aluminum

Both 6081 aluminum and 7178 aluminum are aluminum alloys. They have 89% of their average alloy composition in common.

For each property being compared, the top bar is 6081 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
4.5 to 12
Fatigue Strength, MPa 110
120 to 210
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
27
Shear Strength, MPa 180
140 to 380
Tensile Strength: Ultimate (UTS), MPa 310
240 to 640
Tensile Strength: Yield (Proof), MPa 270
120 to 560

Thermal Properties

Latent Heat of Fusion, J/g 410
370
Maximum Temperature: Mechanical, °C 160
180
Melting Completion (Liquidus), °C 640
630
Melting Onset (Solidus), °C 610
480
Specific Heat Capacity, J/kg-K 900
860
Thermal Conductivity, W/m-K 180
130
Thermal Expansion, µm/m-K 23
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 47
31
Electrical Conductivity: Equal Weight (Specific), % IACS 160
91

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
10
Density, g/cm3 2.7
3.1
Embodied Carbon, kg CO2/kg material 8.3
8.2
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1180
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27
24 to 52
Resilience: Unit (Modulus of Resilience), kJ/m3 540
110 to 2220
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
45
Strength to Weight: Axial, points 32
21 to 58
Strength to Weight: Bending, points 37
28 to 54
Thermal Diffusivity, mm2/s 74
47
Thermal Shock Resistance, points 14
10 to 28

Alloy Composition

Aluminum (Al), % 96.3 to 98.6
85.4 to 89.5
Chromium (Cr), % 0 to 0.1
0.18 to 0.28
Copper (Cu), % 0 to 0.1
1.6 to 2.4
Iron (Fe), % 0 to 0.5
0 to 0.5
Magnesium (Mg), % 0.6 to 1.0
2.4 to 3.1
Manganese (Mn), % 0.1 to 0.45
0 to 0.3
Silicon (Si), % 0.7 to 1.1
0 to 0.4
Titanium (Ti), % 0 to 0.15
0 to 0.2
Zinc (Zn), % 0 to 0.2
6.3 to 7.3
Residuals, % 0
0 to 0.15