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4145 Aluminum vs. SAE-AISI T15 Steel

4145 aluminum belongs to the aluminum alloys classification, while SAE-AISI T15 steel belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (11, 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 SAE-AISI T15 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
200
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 28
76
Tensile Strength: Ultimate (UTS), MPa 120
830 to 2240

Thermal Properties

Latent Heat of Fusion, J/g 540
250
Melting Completion (Liquidus), °C 590
1690
Melting Onset (Solidus), °C 520
1640
Specific Heat Capacity, J/kg-K 880
430
Thermal Conductivity, W/m-K 100
21
Thermal Expansion, µm/m-K 21
12

Otherwise Unclassified Properties

Base Metal Price, % relative 10
43
Density, g/cm3 2.8
8.7
Embodied Carbon, kg CO2/kg material 7.6
16
Embodied Energy, MJ/kg 140
250
Embodied Water, L/kg 1040
140

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
22
Strength to Weight: Axial, points 12
26 to 71
Strength to Weight: Bending, points 19
22 to 43
Thermal Diffusivity, mm2/s 42
5.6
Thermal Shock Resistance, points 5.5
26 to 70

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
1.5 to 1.6
Chromium (Cr), % 0 to 0.15
3.8 to 5.0
Cobalt (Co), % 0
4.8 to 5.3
Copper (Cu), % 3.3 to 4.7
0 to 0.25
Iron (Fe), % 0 to 0.8
67.5 to 73.5
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0.15 to 0.4
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 9.3 to 10.7
0.15 to 0.4
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
11.8 to 13
Vanadium (V), % 0
4.5 to 5.3
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0