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2025 Aluminum vs. Grey Cast Iron

2025 aluminum belongs to the aluminum alloys classification, while grey cast iron belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 2025 aluminum and the bottom bar is grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 110
160 to 300
Elastic (Young's, Tensile) Modulus, GPa 72
180
Elongation at Break, % 15
9.6
Fatigue Strength, MPa 130
69 to 170
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
69
Shear Strength, MPa 240
180 to 610
Tensile Strength: Ultimate (UTS), MPa 400
160 to 450
Tensile Strength: Yield (Proof), MPa 260
98 to 290

Thermal Properties

Latent Heat of Fusion, J/g 400
280
Melting Completion (Liquidus), °C 640
1380
Melting Onset (Solidus), °C 520
1180
Specific Heat Capacity, J/kg-K 870
490
Thermal Conductivity, W/m-K 150
46
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 120
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 10
1.9
Density, g/cm3 3.0
7.5
Embodied Carbon, kg CO2/kg material 7.9
1.5
Embodied Energy, MJ/kg 150
21
Embodied Water, L/kg 1130
44

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 55
13 to 37
Resilience: Unit (Modulus of Resilience), kJ/m3 450
27 to 240
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 46
25
Strength to Weight: Axial, points 37
5.8 to 17
Strength to Weight: Bending, points 40
8.7 to 17
Thermal Diffusivity, mm2/s 58
13
Thermal Shock Resistance, points 18
6.0 to 17

Alloy Composition

Aluminum (Al), % 90.9 to 95.2
0
Carbon (C), % 0
3.1 to 3.4
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 3.9 to 5.0
0
Iron (Fe), % 0 to 1.0
92.1 to 93.9
Magnesium (Mg), % 0 to 0.050
0
Manganese (Mn), % 0.4 to 1.2
0.5 to 0.7
Phosphorus (P), % 0
0 to 0.9
Silicon (Si), % 0.5 to 1.2
2.5 to 2.8
Sulfur (S), % 0
0 to 0.15
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0