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7178 Aluminum vs. SAE-AISI T8 Steel

7178 aluminum belongs to the aluminum alloys classification, while SAE-AISI T8 steel belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is 7178 aluminum and the bottom bar is SAE-AISI T8 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
200
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
78
Tensile Strength: Ultimate (UTS), MPa 240 to 640
780 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 370
250
Melting Completion (Liquidus), °C 630
1730
Melting Onset (Solidus), °C 480
1670
Specific Heat Capacity, J/kg-K 860
420
Thermal Conductivity, W/m-K 130
18
Thermal Expansion, µm/m-K 23
12

Otherwise Unclassified Properties

Base Metal Price, % relative 10
45
Density, g/cm3 3.1
9.0
Embodied Carbon, kg CO2/kg material 8.2
10
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1110
120

Common Calculations

Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 45
22
Strength to Weight: Axial, points 21 to 58
24 to 66
Strength to Weight: Bending, points 28 to 54
21 to 41
Thermal Diffusivity, mm2/s 47
4.8
Thermal Shock Resistance, points 10 to 28
24 to 66

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Carbon (C), % 0
0.75 to 0.85
Chromium (Cr), % 0.18 to 0.28
3.8 to 4.5
Cobalt (Co), % 0
4.3 to 5.8
Copper (Cu), % 1.6 to 2.4
0 to 0.25
Iron (Fe), % 0 to 0.5
69.3 to 75.4
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0.2 to 0.4
Molybdenum (Mo), % 0
0.4 to 1.0
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.4
0.2 to 0.4
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.2
0
Tungsten (W), % 0
13.3 to 14.8
Vanadium (V), % 0
1.8 to 2.4
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0

Comparable Variants