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7178 Aluminum vs. C66700 Brass

7178 aluminum belongs to the aluminum alloys classification, while C66700 brass belongs to the copper alloys. There are 29 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 C66700 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
110
Elongation at Break, % 4.5 to 12
2.0 to 58
Poisson's Ratio 0.32
0.31
Shear Modulus, GPa 27
41
Shear Strength, MPa 140 to 380
250 to 530
Tensile Strength: Ultimate (UTS), MPa 240 to 640
340 to 690
Tensile Strength: Yield (Proof), MPa 120 to 560
100 to 640

Thermal Properties

Latent Heat of Fusion, J/g 370
180
Maximum Temperature: Mechanical, °C 180
140
Melting Completion (Liquidus), °C 630
1090
Melting Onset (Solidus), °C 480
1050
Specific Heat Capacity, J/kg-K 860
390
Thermal Conductivity, W/m-K 130
97
Thermal Expansion, µm/m-K 23
20

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
17
Electrical Conductivity: Equal Weight (Specific), % IACS 91
19

Otherwise Unclassified Properties

Base Metal Price, % relative 10
25
Density, g/cm3 3.1
8.2
Embodied Carbon, kg CO2/kg material 8.2
2.7
Embodied Energy, MJ/kg 150
45
Embodied Water, L/kg 1110
320

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
13 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
49 to 1900
Stiffness to Weight: Axial, points 13
7.3
Stiffness to Weight: Bending, points 45
19
Strength to Weight: Axial, points 21 to 58
11 to 23
Strength to Weight: Bending, points 28 to 54
13 to 21
Thermal Diffusivity, mm2/s 47
30
Thermal Shock Resistance, points 10 to 28
11 to 23

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
68.5 to 71.5
Iron (Fe), % 0 to 0.5
0 to 0.1
Lead (Pb), % 0
0 to 0.070
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0.8 to 1.5
Silicon (Si), % 0 to 0.4
0
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
26.3 to 30.7
Residuals, % 0
0 to 0.5