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2025 Aluminum vs. Ductile Cast Iron

2025 aluminum belongs to the aluminum alloys classification, while ductile 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 ductile cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 110
160 to 310
Elastic (Young's, Tensile) Modulus, GPa 72
170 to 180
Elongation at Break, % 15
2.1 to 20
Poisson's Ratio 0.33
0.28 to 0.31
Shear Modulus, GPa 27
64 to 70
Shear Strength, MPa 240
420 to 800
Tensile Strength: Ultimate (UTS), MPa 400
460 to 920
Tensile Strength: Yield (Proof), MPa 260
310 to 670

Thermal Properties

Latent Heat of Fusion, J/g 400
270
Maximum Temperature: Mechanical, °C 190
290
Melting Completion (Liquidus), °C 640
1160
Melting Onset (Solidus), °C 520
1120
Specific Heat Capacity, J/kg-K 870
490
Thermal Conductivity, W/m-K 150
31 to 36
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 120
8.8 to 9.4

Otherwise Unclassified Properties

Base Metal Price, % relative 10
1.9
Density, g/cm3 3.0
7.1 to 7.5
Embodied Carbon, kg CO2/kg material 7.9
1.5
Embodied Energy, MJ/kg 150
21
Embodied Water, L/kg 1130
43

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 55
17 to 80
Resilience: Unit (Modulus of Resilience), kJ/m3 450
280 to 1330
Stiffness to Weight: Axial, points 13
12 to 14
Stiffness to Weight: Bending, points 46
24 to 26
Strength to Weight: Axial, points 37
17 to 35
Strength to Weight: Bending, points 40
18 to 29
Thermal Diffusivity, mm2/s 58
8.9 to 10
Thermal Shock Resistance, points 18
17 to 35

Alloy Composition

Aluminum (Al), % 90.9 to 95.2
0
Carbon (C), % 0
3.0 to 3.5
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 3.9 to 5.0
0
Iron (Fe), % 0 to 1.0
93.7 to 95.5
Magnesium (Mg), % 0 to 0.050
0
Manganese (Mn), % 0.4 to 1.2
0
Phosphorus (P), % 0
0 to 0.080
Silicon (Si), % 0.5 to 1.2
1.5 to 2.8
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0