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7178 Aluminum vs. SAE-AISI D5 Steel

7178 aluminum belongs to the aluminum alloys classification, while SAE-AISI D5 steel belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (6, 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 D5 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 4.5 to 12
5.4 to 14
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
75
Shear Strength, MPa 140 to 380
470 to 1180
Tensile Strength: Ultimate (UTS), MPa 240 to 640
770 to 2030

Thermal Properties

Latent Heat of Fusion, J/g 370
270
Melting Completion (Liquidus), °C 630
1430
Melting Onset (Solidus), °C 480
1390
Specific Heat Capacity, J/kg-K 860
480
Thermal Conductivity, W/m-K 130
27
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
4.2
Electrical Conductivity: Equal Weight (Specific), % IACS 91
4.9

Otherwise Unclassified Properties

Base Metal Price, % relative 10
13
Density, g/cm3 3.1
7.7
Embodied Carbon, kg CO2/kg material 8.2
3.5
Embodied Energy, MJ/kg 150
51
Embodied Water, L/kg 1110
120

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
25
Strength to Weight: Axial, points 21 to 58
28 to 73
Strength to Weight: Bending, points 28 to 54
24 to 46
Thermal Diffusivity, mm2/s 47
7.4
Thermal Shock Resistance, points 10 to 28
26 to 67

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Carbon (C), % 0
1.4 to 1.6
Chromium (Cr), % 0.18 to 0.28
11 to 13
Cobalt (Co), % 0
2.5 to 3.5
Copper (Cu), % 1.6 to 2.4
0 to 0.25
Iron (Fe), % 0 to 0.5
77.9 to 84.4
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0 to 0.6
Molybdenum (Mo), % 0
0.7 to 1.2
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.4
0 to 0.6
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.2
0
Vanadium (V), % 0
0 to 1.0
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0

Comparable Variants