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SAE-AISI T5 Steel vs. 4145 Aluminum

SAE-AISI T5 steel belongs to the iron alloys classification, while 4145 aluminum belongs to the aluminum 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 SAE-AISI T5 steel and the bottom bar is 4145 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
73
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 80
28
Tensile Strength: Ultimate (UTS), MPa 860 to 2140
120

Thermal Properties

Latent Heat of Fusion, J/g 250
540
Melting Completion (Liquidus), °C 1810
590
Melting Onset (Solidus), °C 1750
520
Specific Heat Capacity, J/kg-K 410
880
Thermal Conductivity, W/m-K 21
100
Thermal Expansion, µm/m-K 11
21

Otherwise Unclassified Properties

Base Metal Price, % relative 60
10
Density, g/cm3 9.4
2.8
Embodied Carbon, kg CO2/kg material 11
7.6
Embodied Energy, MJ/kg 170
140
Embodied Water, L/kg 140
1040

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
50
Strength to Weight: Axial, points 25 to 63
12
Strength to Weight: Bending, points 21 to 39
19
Thermal Diffusivity, mm2/s 5.5
42
Thermal Shock Resistance, points 26 to 66
5.5

Alloy Composition

Aluminum (Al), % 0
83 to 87.4
Carbon (C), % 0.75 to 0.85
0
Chromium (Cr), % 3.8 to 5.0
0 to 0.15
Cobalt (Co), % 7.0 to 9.5
0
Copper (Cu), % 0 to 0.25
3.3 to 4.7
Iron (Fe), % 60.6 to 68.3
0 to 0.8
Magnesium (Mg), % 0
0 to 0.15
Manganese (Mn), % 0.2 to 0.4
0 to 0.15
Molybdenum (Mo), % 0.5 to 1.3
0
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 0.4
9.3 to 10.7
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 17.5 to 19
0
Vanadium (V), % 1.8 to 2.4
0
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15