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7108 Aluminum vs. 7178 Aluminum

Both 7108 aluminum and 7178 aluminum are aluminum alloys. They have a moderately high 94% of their average alloy composition in common.

For each property being compared, the top bar is 7108 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, % 11
4.5 to 12
Fatigue Strength, MPa 120
120 to 210
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
27
Shear Strength, MPa 210
140 to 380
Tensile Strength: Ultimate (UTS), MPa 350
240 to 640
Tensile Strength: Yield (Proof), MPa 290
120 to 560

Thermal Properties

Latent Heat of Fusion, J/g 380
370
Maximum Temperature: Mechanical, °C 210
180
Melting Completion (Liquidus), °C 630
630
Melting Onset (Solidus), °C 530
480
Specific Heat Capacity, J/kg-K 880
860
Thermal Conductivity, W/m-K 150
130
Thermal Expansion, µm/m-K 24
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 39
31
Electrical Conductivity: Equal Weight (Specific), % IACS 120
91

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
10
Density, g/cm3 2.9
3.1
Embodied Carbon, kg CO2/kg material 8.3
8.2
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1150
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 38
24 to 52
Resilience: Unit (Modulus of Resilience), kJ/m3 620
110 to 2220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
45
Strength to Weight: Axial, points 34
21 to 58
Strength to Weight: Bending, points 38
28 to 54
Thermal Diffusivity, mm2/s 59
47
Thermal Shock Resistance, points 16
10 to 28

Alloy Composition

Aluminum (Al), % 92.4 to 94.7
85.4 to 89.5
Chromium (Cr), % 0
0.18 to 0.28
Copper (Cu), % 0 to 0.050
1.6 to 2.4
Iron (Fe), % 0 to 0.1
0 to 0.5
Magnesium (Mg), % 0.7 to 1.4
2.4 to 3.1
Manganese (Mn), % 0 to 0.050
0 to 0.3
Silicon (Si), % 0 to 0.1
0 to 0.4
Titanium (Ti), % 0 to 0.050
0 to 0.2
Zinc (Zn), % 4.5 to 5.5
6.3 to 7.3
Zirconium (Zr), % 0.12 to 0.25
0
Residuals, % 0
0 to 0.15