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Automotive Grey Cast Iron vs. 705.0 Aluminum

Automotive grey cast iron belongs to the iron alloys classification, while 705.0 aluminum belongs to the aluminum alloys. There are 28 material properties with values for both materials. Properties with values for just one material (3, 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 705.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 280
62 to 65
Elastic (Young's, Tensile) Modulus, GPa 180
69
Elongation at Break, % 9.6 to 14
8.4 to 10
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 69 to 70
26
Tensile Strength: Ultimate (UTS), MPa 140 to 290
240 to 260
Tensile Strength: Yield (Proof), MPa 94 to 200
130

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
610
Specific Heat Capacity, J/kg-K 490
890
Thermal Conductivity, W/m-K 41 to 43
140
Thermal Expansion, µm/m-K 12 to 14
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4 to 7.6
34
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.1
110

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9 to 3.0
9.5
Density, g/cm3 7.5 to 7.6
2.8
Embodied Carbon, kg CO2/kg material 1.5 to 1.7
8.4
Embodied Energy, MJ/kg 21 to 24
150
Embodied Water, L/kg 44 to 51
1170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 25
18 to 20
Resilience: Unit (Modulus of Resilience), kJ/m3 25 to 110
120 to 130
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
49
Strength to Weight: Axial, points 5.2 to 11
24 to 26
Strength to Weight: Bending, points 8.0 to 13
31 to 32
Thermal Diffusivity, mm2/s 11 to 12
55
Thermal Shock Resistance, points 4.2 to 8.6
11