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7178 Aluminum vs. C23400 Brass

7178 aluminum belongs to the aluminum alloys classification, while C23400 brass belongs to the copper alloys. There are 22 material properties with values for both materials. Properties with values for just one material (10, 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 7178 aluminum and the bottom bar is C23400 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
110
Poisson's Ratio 0.32
0.32
Shear Modulus, GPa 27
42
Tensile Strength: Ultimate (UTS), MPa 240 to 640
370 to 640

Thermal Properties

Latent Heat of Fusion, J/g 370
190
Maximum Temperature: Mechanical, °C 180
160
Melting Completion (Liquidus), °C 630
970
Melting Onset (Solidus), °C 480
930
Specific Heat Capacity, J/kg-K 860
390
Thermal Conductivity, W/m-K 130
120
Thermal Expansion, µm/m-K 23
19

Otherwise Unclassified Properties

Base Metal Price, % relative 10
27
Density, g/cm3 3.1
8.5
Embodied Carbon, kg CO2/kg material 8.2
2.6
Embodied Energy, MJ/kg 150
43
Embodied Water, L/kg 1110
320

Common Calculations

Stiffness to Weight: Axial, points 13
7.2
Stiffness to Weight: Bending, points 45
19
Strength to Weight: Axial, points 21 to 58
12 to 21
Strength to Weight: Bending, points 28 to 54
13 to 19
Thermal Diffusivity, mm2/s 47
36
Thermal Shock Resistance, points 10 to 28
12 to 22

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Chromium (Cr), % 0.18 to 0.28
0
Copper (Cu), % 1.6 to 2.4
81 to 84
Iron (Fe), % 0 to 0.5
0 to 0.050
Lead (Pb), % 0
0 to 0.050
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0
Silicon (Si), % 0 to 0.4
0
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
15.7 to 19
Residuals, % 0
0 to 0.2