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7178 Aluminum vs. C99700 Brass

7178 aluminum belongs to the aluminum alloys classification, while C99700 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 C99700 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
120
Elongation at Break, % 4.5 to 12
25
Poisson's Ratio 0.32
0.32
Shear Modulus, GPa 27
46
Tensile Strength: Ultimate (UTS), MPa 240 to 640
380
Tensile Strength: Yield (Proof), MPa 120 to 560
170

Thermal Properties

Latent Heat of Fusion, J/g 370
200
Maximum Temperature: Mechanical, °C 180
160
Melting Completion (Liquidus), °C 630
900
Melting Onset (Solidus), °C 480
880
Specific Heat Capacity, J/kg-K 860
410
Thermal Expansion, µm/m-K 23
20

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 91
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 10
25
Density, g/cm3 3.1
8.1
Embodied Carbon, kg CO2/kg material 8.2
3.3
Embodied Energy, MJ/kg 150
53
Embodied Water, L/kg 1110
320

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
78
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
120
Stiffness to Weight: Axial, points 13
8.3
Stiffness to Weight: Bending, points 45
20
Strength to Weight: Axial, points 21 to 58
13
Strength to Weight: Bending, points 28 to 54
14
Thermal Shock Resistance, points 10 to 28
11

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0.5 to 3.0
Chromium (Cr), % 0.18 to 0.28
0
Copper (Cu), % 1.6 to 2.4
54 to 65.5
Iron (Fe), % 0 to 0.5
0 to 1.0
Lead (Pb), % 0
0 to 2.0
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
11 to 15
Nickel (Ni), % 0
4.0 to 6.0
Silicon (Si), % 0 to 0.4
0
Tin (Sn), % 0
0 to 1.0
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
19 to 25
Residuals, % 0
0 to 0.3