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Automotive Grey Cast Iron vs. 2007 Aluminum

Automotive grey cast iron belongs to the iron alloys classification, while 2007 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 grey cast iron and the bottom bar is 2007 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
71
Elongation at Break, % 9.6 to 14
5.6 to 8.0
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 69 to 70
27
Tensile Strength: Ultimate (UTS), MPa 140 to 290
370 to 420
Tensile Strength: Yield (Proof), MPa 94 to 200
240 to 270

Thermal Properties

Latent Heat of Fusion, J/g 260 to 280
390
Melting Completion (Liquidus), °C 1380 to 1390
640
Melting Onset (Solidus), °C 1340 to 1350
510
Specific Heat Capacity, J/kg-K 490
870
Thermal Conductivity, W/m-K 41 to 43
130
Thermal Expansion, µm/m-K 12 to 14
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4 to 7.6
47
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.1
140

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9 to 3.0
11
Density, g/cm3 7.5 to 7.6
3.1
Embodied Carbon, kg CO2/kg material 1.5 to 1.7
8.0
Embodied Energy, MJ/kg 21 to 24
150
Embodied Water, L/kg 44 to 51
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 25
21 to 26
Resilience: Unit (Modulus of Resilience), kJ/m3 25 to 110
390 to 530
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
44
Strength to Weight: Axial, points 5.2 to 11
33 to 38
Strength to Weight: Bending, points 8.0 to 13
37 to 40
Thermal Diffusivity, mm2/s 11 to 12
48
Thermal Shock Resistance, points 4.2 to 8.6
16 to 19