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7178 Aluminum vs. CC751S Brass

7178 aluminum belongs to the aluminum alloys classification, while CC751S brass belongs to the copper alloys. There are 28 material properties with values for both materials. Properties with values for just one material (3, 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 CC751S brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
110
Elongation at Break, % 4.5 to 12
5.6
Poisson's Ratio 0.32
0.31
Shear Modulus, GPa 27
40
Tensile Strength: Ultimate (UTS), MPa 240 to 640
450
Tensile Strength: Yield (Proof), MPa 120 to 560
320

Thermal Properties

Latent Heat of Fusion, J/g 370
190
Maximum Temperature: Mechanical, °C 180
130
Melting Completion (Liquidus), °C 630
850
Melting Onset (Solidus), °C 480
810
Specific Heat Capacity, J/kg-K 860
390
Thermal Conductivity, W/m-K 130
110
Thermal Expansion, µm/m-K 23
20

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
25
Electrical Conductivity: Equal Weight (Specific), % IACS 91
28

Otherwise Unclassified Properties

Base Metal Price, % relative 10
24
Density, g/cm3 3.1
8.1
Embodied Carbon, kg CO2/kg material 8.2
2.8
Embodied Energy, MJ/kg 150
46
Embodied Water, L/kg 1110
330

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
23
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
480
Stiffness to Weight: Axial, points 13
7.2
Stiffness to Weight: Bending, points 45
19
Strength to Weight: Axial, points 21 to 58
15
Strength to Weight: Bending, points 28 to 54
16
Thermal Diffusivity, mm2/s 47
35
Thermal Shock Resistance, points 10 to 28
15

Alloy Composition


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Aluminum (Al), % 85.4 to 89.5
0 to 0.1
Antimony (Sb), % 0
0 to 0.5
Chromium (Cr), % 0.18 to 0.28
0
Copper (Cu), % 1.6 to 2.4
62.7 to 66
Iron (Fe), % 0 to 0.5
0.25 to 0.5
Lead (Pb), % 0
0.8 to 2.2
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0 to 0.15
Nickel (Ni), % 0
0 to 0.8
Silicon (Si), % 0 to 0.4
0.65 to 1.1
Tin (Sn), % 0
0 to 0.8
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
27.9 to 35.6
Residuals, % 0 to 0.15
0