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3105 Aluminum vs. C68700 Brass

3105 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 (6, 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 3105 aluminum and the bottom bar is C68700 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
110
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
41
Tensile Strength: Ultimate (UTS), MPa 120 to 240
390
Tensile Strength: Yield (Proof), MPa 46 to 220
140

Thermal Properties

Latent Heat of Fusion, J/g 400
190
Maximum Temperature: Mechanical, °C 180
160
Melting Completion (Liquidus), °C 660
970
Melting Onset (Solidus), °C 640
930
Specific Heat Capacity, J/kg-K 900
400
Thermal Conductivity, W/m-K 170
100
Thermal Expansion, µm/m-K 24
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 44
23
Electrical Conductivity: Equal Weight (Specific), % IACS 140
25

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
26
Density, g/cm3 2.8
8.3
Embodied Carbon, kg CO2/kg material 8.2
2.8
Embodied Energy, MJ/kg 150
46
Embodied Water, L/kg 1180
340

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 15 to 340
90
Stiffness to Weight: Axial, points 14
7.3
Stiffness to Weight: Bending, points 50
19
Strength to Weight: Axial, points 12 to 24
13
Strength to Weight: Bending, points 20 to 31
14
Thermal Diffusivity, mm2/s 68
30
Thermal Shock Resistance, points 5.2 to 11
13

Alloy Composition

Aluminum (Al), % 96 to 99.5
1.8 to 2.5
Arsenic (As), % 0
0.020 to 0.1
Chromium (Cr), % 0 to 0.2
0
Copper (Cu), % 0 to 0.3
76 to 79
Iron (Fe), % 0 to 0.7
0 to 0.060
Lead (Pb), % 0
0 to 0.070
Magnesium (Mg), % 0.2 to 0.8
0
Manganese (Mn), % 0.3 to 0.8
0
Silicon (Si), % 0 to 0.6
0
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 0 to 0.4
17.8 to 22.2
Residuals, % 0
0 to 0.5