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Automotive Malleable Cast Iron vs. 8176 Aluminum

Automotive malleable cast iron belongs to the iron alloys classification, while 8176 aluminum belongs to the aluminum alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, 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 automotive malleable cast iron and the bottom bar is 8176 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
69
Elongation at Break, % 1.0 to 10
15
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 70
26
Tensile Strength: Ultimate (UTS), MPa 350 to 720
160
Tensile Strength: Yield (Proof), MPa 220 to 590
95

Thermal Properties

Latent Heat of Fusion, J/g 260
400
Melting Completion (Liquidus), °C 1410
660
Melting Onset (Solidus), °C 1370
650
Specific Heat Capacity, J/kg-K 480
900
Thermal Conductivity, W/m-K 41
230
Thermal Expansion, µm/m-K 14
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
61
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
200

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
9.5
Density, g/cm3 7.6
2.7
Embodied Carbon, kg CO2/kg material 1.5
8.2
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 45
1190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.8 to 30
21
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 950
66
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 13 to 26
16
Strength to Weight: Bending, points 14 to 24
24
Thermal Diffusivity, mm2/s 11
93
Thermal Shock Resistance, points 9.9 to 21
7.0

Alloy Composition

Aluminum (Al), % 0
98.6 to 99.6
Carbon (C), % 2.2 to 2.9
0
Gallium (Ga), % 0
0 to 0.030
Iron (Fe), % 93.6 to 96.7
0.4 to 1.0
Manganese (Mn), % 0.15 to 1.3
0
Phosphorus (P), % 0.020 to 0.15
0
Silicon (Si), % 0.9 to 1.9
0.030 to 0.15
Sulfur (S), % 0.020 to 0.2
0
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15