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7178 Aluminum vs. C68700 Brass

7178 aluminum belongs to the aluminum alloys classification, while C68700 brass belongs to the copper alloys. There are 26 material properties with values for both materials. Properties with values for just one material (4, 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 C68700 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
41
Tensile Strength: Ultimate (UTS), MPa 240 to 640
390
Tensile Strength: Yield (Proof), MPa 120 to 560
140

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
400
Thermal Conductivity, W/m-K 130
100
Thermal Expansion, µm/m-K 23
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
23
Electrical Conductivity: Equal Weight (Specific), % IACS 91
25

Otherwise Unclassified Properties

Base Metal Price, % relative 10
26
Density, g/cm3 3.1
8.3
Embodied Carbon, kg CO2/kg material 8.2
2.8
Embodied Energy, MJ/kg 150
46
Embodied Water, L/kg 1110
340

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
90
Stiffness to Weight: Axial, points 13
7.3
Stiffness to Weight: Bending, points 45
19
Strength to Weight: Axial, points 21 to 58
13
Strength to Weight: Bending, points 28 to 54
14
Thermal Diffusivity, mm2/s 47
30
Thermal Shock Resistance, points 10 to 28
13

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
1.8 to 2.5
Arsenic (As), % 0
0.020 to 0.1
Chromium (Cr), % 0.18 to 0.28
0
Copper (Cu), % 1.6 to 2.4
76 to 79
Iron (Fe), % 0 to 0.5
0 to 0.060
Lead (Pb), % 0
0 to 0.070
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
17.8 to 22.2
Residuals, % 0
0 to 0.5