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4145 Aluminum vs. Automotive Grey Cast Iron

4145 aluminum belongs to the aluminum alloys classification, while automotive grey cast iron belongs to the iron 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 4145 aluminum and the bottom bar is automotive grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
180
Elongation at Break, % 2.2
9.6 to 14
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 28
69 to 70
Tensile Strength: Ultimate (UTS), MPa 120
140 to 290
Tensile Strength: Yield (Proof), MPa 68
94 to 200

Thermal Properties

Latent Heat of Fusion, J/g 540
260 to 280
Melting Completion (Liquidus), °C 590
1380 to 1390
Melting Onset (Solidus), °C 520
1340 to 1350
Specific Heat Capacity, J/kg-K 880
490
Thermal Conductivity, W/m-K 100
41 to 43
Thermal Expansion, µm/m-K 21
12 to 14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
7.4 to 7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 84
8.8 to 9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 10
1.9 to 3.0
Density, g/cm3 2.8
7.5 to 7.6
Embodied Carbon, kg CO2/kg material 7.6
1.5 to 1.7
Embodied Energy, MJ/kg 140
21 to 24
Embodied Water, L/kg 1040
44 to 51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
18 to 25
Resilience: Unit (Modulus of Resilience), kJ/m3 31
25 to 110
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 12
5.2 to 11
Strength to Weight: Bending, points 19
8.0 to 13
Thermal Diffusivity, mm2/s 42
11 to 12
Thermal Shock Resistance, points 5.5
4.2 to 8.6