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Automotive Malleable Cast Iron vs. 7003 Aluminum

Automotive malleable cast iron belongs to the iron alloys classification, while 7003 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 7003 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
70
Elongation at Break, % 1.0 to 10
11
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 70
26
Tensile Strength: Ultimate (UTS), MPa 350 to 720
350 to 390
Tensile Strength: Yield (Proof), MPa 220 to 590
300 to 310

Thermal Properties

Latent Heat of Fusion, J/g 260
380
Melting Completion (Liquidus), °C 1410
630
Melting Onset (Solidus), °C 1370
510
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 41
150
Thermal Expansion, µm/m-K 14
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
36
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
110

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
9.5
Density, g/cm3 7.6
2.9
Embodied Carbon, kg CO2/kg material 1.5
8.1
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 45
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.8 to 30
37 to 41
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 950
630 to 710
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
47
Strength to Weight: Axial, points 13 to 26
33 to 37
Strength to Weight: Bending, points 14 to 24
37 to 40
Thermal Diffusivity, mm2/s 11
59
Thermal Shock Resistance, points 9.9 to 21
15 to 17

Alloy Composition

Aluminum (Al), % 0
90.6 to 94.5
Carbon (C), % 2.2 to 2.9
0
Chromium (Cr), % 0
0 to 0.2
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 93.6 to 96.7
0 to 0.35
Magnesium (Mg), % 0
0.5 to 1.0
Manganese (Mn), % 0.15 to 1.3
0 to 0.3
Phosphorus (P), % 0.020 to 0.15
0
Silicon (Si), % 0.9 to 1.9
0 to 0.3
Sulfur (S), % 0.020 to 0.2
0
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0
5.0 to 6.5
Zirconium (Zr), % 0
0.050 to 0.25
Residuals, % 0
0 to 0.15