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4145 Aluminum vs. SAE-AISI M47 Steel

4145 aluminum belongs to the aluminum alloys classification, while SAE-AISI M47 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 M47 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
77
Tensile Strength: Ultimate (UTS), MPa 120
810 to 2310

Thermal Properties

Latent Heat of Fusion, J/g 540
270
Melting Completion (Liquidus), °C 590
1540
Melting Onset (Solidus), °C 520
1500
Specific Heat Capacity, J/kg-K 880
450
Thermal Conductivity, W/m-K 100
23
Thermal Expansion, µm/m-K 21
11

Otherwise Unclassified Properties

Base Metal Price, % relative 10
26
Density, g/cm3 2.8
8.1
Embodied Carbon, kg CO2/kg material 7.6
7.4
Embodied Energy, MJ/kg 140
100
Embodied Water, L/kg 1040
120

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 12
28 to 79
Strength to Weight: Bending, points 19
24 to 48
Thermal Diffusivity, mm2/s 42
6.3
Thermal Shock Resistance, points 5.5
27 to 77

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
1.1 to 1.2
Chromium (Cr), % 0 to 0.15
3.5 to 4.0
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
78.7 to 85
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0.15 to 0.4
Molybdenum (Mo), % 0
9.3 to 10
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 9.3 to 10.7
0.2 to 0.45
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
1.3 to 1.8
Vanadium (V), % 0
1.2 to 1.4
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0