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4145 Aluminum vs. C27000 Brass

4145 aluminum belongs to the aluminum alloys classification, while C27000 brass belongs to the copper alloys. There are 24 material properties with values for both materials. Properties with values for just one material (9, 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 C27000 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
110
Poisson's Ratio 0.33
0.31
Shear Modulus, GPa 28
40
Tensile Strength: Ultimate (UTS), MPa 120
370 to 650

Thermal Properties

Latent Heat of Fusion, J/g 540
180
Maximum Temperature: Mechanical, °C 160
130
Melting Completion (Liquidus), °C 590
930
Melting Onset (Solidus), °C 520
900
Specific Heat Capacity, J/kg-K 880
390
Thermal Conductivity, W/m-K 100
120
Thermal Expansion, µm/m-K 21
20

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
27
Electrical Conductivity: Equal Weight (Specific), % IACS 84
30

Otherwise Unclassified Properties

Base Metal Price, % relative 10
24
Density, g/cm3 2.8
8.1
Embodied Carbon, kg CO2/kg material 7.6
2.7
Embodied Energy, MJ/kg 140
45
Embodied Water, L/kg 1040
320

Common Calculations

Stiffness to Weight: Axial, points 14
7.2
Stiffness to Weight: Bending, points 50
19
Strength to Weight: Axial, points 12
13 to 22
Strength to Weight: Bending, points 19
14 to 21
Thermal Diffusivity, mm2/s 42
37
Thermal Shock Resistance, points 5.5
12 to 22

Alloy Composition

Aluminum (Al), % 83 to 87.4
0
Chromium (Cr), % 0 to 0.15
0
Copper (Cu), % 3.3 to 4.7
63 to 68.5
Iron (Fe), % 0 to 0.8
0 to 0.1
Lead (Pb), % 0
0 to 0.070
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0
Silicon (Si), % 9.3 to 10.7
0
Zinc (Zn), % 0 to 0.2
31 to 37
Residuals, % 0
0 to 0.3