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Automotive Malleable Cast Iron vs. 4145 Aluminum

Automotive malleable cast iron belongs to the iron alloys classification, while 4145 aluminum belongs to the aluminum alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, 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 4145 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
73
Elongation at Break, % 1.0 to 10
2.2
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 70
28
Tensile Strength: Ultimate (UTS), MPa 350 to 720
120
Tensile Strength: Yield (Proof), MPa 220 to 590
68

Thermal Properties

Latent Heat of Fusion, J/g 260
540
Melting Completion (Liquidus), °C 1410
590
Melting Onset (Solidus), °C 1370
520
Specific Heat Capacity, J/kg-K 480
880
Thermal Conductivity, W/m-K 41
100
Thermal Expansion, µm/m-K 14
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
26
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
84

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
10
Density, g/cm3 7.6
2.8
Embodied Carbon, kg CO2/kg material 1.5
7.6
Embodied Energy, MJ/kg 20
140
Embodied Water, L/kg 45
1040

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.8 to 30
2.3
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 950
31
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 13 to 26
12
Strength to Weight: Bending, points 14 to 24
19
Thermal Diffusivity, mm2/s 11
42
Thermal Shock Resistance, points 9.9 to 21
5.5

Alloy Composition


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Aluminum (Al), % 0
83 to 87.4
Carbon (C), % 2.2 to 2.9
0
Chromium (Cr), % 0
0 to 0.15
Copper (Cu), % 0
3.3 to 4.7
Iron (Fe), % 93.6 to 96.7
0 to 0.8
Magnesium (Mg), % 0
0 to 0.15
Manganese (Mn), % 0.15 to 1.3
0 to 0.15
Phosphorus (P), % 0.020 to 0.15
0
Silicon (Si), % 0.9 to 1.9
9.3 to 10.7
Sulfur (S), % 0.020 to 0.2
0
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15