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2018 Aluminum vs. C68400 Brass

2018 aluminum belongs to the aluminum alloys classification, while C68400 brass belongs to the copper alloys. There are 30 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 2018 aluminum and the bottom bar is C68400 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
150
Elastic (Young's, Tensile) Modulus, GPa 73
110
Elongation at Break, % 9.6
18
Poisson's Ratio 0.33
0.31
Shear Modulus, GPa 27
41
Shear Strength, MPa 270
330
Tensile Strength: Ultimate (UTS), MPa 420
540
Tensile Strength: Yield (Proof), MPa 310
310

Thermal Properties

Latent Heat of Fusion, J/g 390
210
Maximum Temperature: Mechanical, °C 220
130
Melting Completion (Liquidus), °C 640
840
Melting Onset (Solidus), °C 510
820
Specific Heat Capacity, J/kg-K 870
400
Thermal Conductivity, W/m-K 150
66
Thermal Expansion, µm/m-K 22
20

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
87
Electrical Conductivity: Equal Weight (Specific), % IACS 120
99

Otherwise Unclassified Properties

Base Metal Price, % relative 11
23
Density, g/cm3 3.1
7.9
Embodied Carbon, kg CO2/kg material 8.1
2.7
Embodied Energy, MJ/kg 150
47
Embodied Water, L/kg 1130
320

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37
81
Resilience: Unit (Modulus of Resilience), kJ/m3 670
460
Stiffness to Weight: Axial, points 13
7.5
Stiffness to Weight: Bending, points 45
20
Strength to Weight: Axial, points 38
19
Strength to Weight: Bending, points 41
19
Thermal Diffusivity, mm2/s 57
21
Thermal Shock Resistance, points 19
18

Alloy Composition

Aluminum (Al), % 89.7 to 94.4
0 to 0.5
Boron (B), % 0
0.0010 to 0.030
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 3.5 to 4.5
59 to 64
Iron (Fe), % 0 to 1.0
0 to 1.0
Lead (Pb), % 0
0 to 0.090
Magnesium (Mg), % 0.45 to 0.9
0
Manganese (Mn), % 0 to 0.2
0.2 to 1.5
Nickel (Ni), % 1.7 to 2.3
0 to 0.5
Phosphorus (P), % 0
0.030 to 0.3
Silicon (Si), % 0 to 0.9
1.5 to 2.5
Tin (Sn), % 0
0 to 0.5
Zinc (Zn), % 0 to 0.25
28.6 to 39.3
Residuals, % 0 to 0.15
0 to 0.5