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7178 Aluminum vs. C69400 Brass

7178 aluminum belongs to the aluminum alloys classification, while C69400 brass belongs to the copper alloys. There are 29 material properties with values for both materials. Properties with values for just one material (1, 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 C69400 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
110
Elongation at Break, % 4.5 to 12
17
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 27
42
Shear Strength, MPa 140 to 380
350
Tensile Strength: Ultimate (UTS), MPa 240 to 640
570
Tensile Strength: Yield (Proof), MPa 120 to 560
270

Thermal Properties

Latent Heat of Fusion, J/g 370
260
Maximum Temperature: Mechanical, °C 180
170
Melting Completion (Liquidus), °C 630
920
Melting Onset (Solidus), °C 480
820
Specific Heat Capacity, J/kg-K 860
410
Thermal Conductivity, W/m-K 130
26
Thermal Expansion, µm/m-K 23
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
6.2
Electrical Conductivity: Equal Weight (Specific), % IACS 91
6.7

Otherwise Unclassified Properties

Base Metal Price, % relative 10
27
Density, g/cm3 3.1
8.3
Embodied Carbon, kg CO2/kg material 8.2
2.7
Embodied Energy, MJ/kg 150
44
Embodied Water, L/kg 1110
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
80
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
340
Stiffness to Weight: Axial, points 13
7.4
Stiffness to Weight: Bending, points 45
19
Strength to Weight: Axial, points 21 to 58
19
Strength to Weight: Bending, points 28 to 54
18
Thermal Diffusivity, mm2/s 47
7.7
Thermal Shock Resistance, points 10 to 28
20

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
80 to 83
Iron (Fe), % 0 to 0.5
0 to 0.2
Lead (Pb), % 0
0 to 0.3
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0
Silicon (Si), % 0 to 0.4
3.5 to 4.5
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
11.5 to 16.5
Residuals, % 0
0 to 0.5