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4145 Aluminum vs. C84800 Brass

4145 aluminum belongs to the aluminum alloys classification, while C84800 brass belongs to the copper alloys. There are 28 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 4145 aluminum and the bottom bar is C84800 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
100
Elongation at Break, % 2.2
18
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 28
39
Tensile Strength: Ultimate (UTS), MPa 120
230
Tensile Strength: Yield (Proof), MPa 68
100

Thermal Properties

Latent Heat of Fusion, J/g 540
180
Maximum Temperature: Mechanical, °C 160
150
Melting Completion (Liquidus), °C 590
950
Melting Onset (Solidus), °C 520
830
Specific Heat Capacity, J/kg-K 880
370
Thermal Conductivity, W/m-K 100
72
Thermal Expansion, µm/m-K 21
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
16
Electrical Conductivity: Equal Weight (Specific), % IACS 84
17

Otherwise Unclassified Properties

Base Metal Price, % relative 10
27
Density, g/cm3 2.8
8.6
Embodied Carbon, kg CO2/kg material 7.6
2.8
Embodied Energy, MJ/kg 140
46
Embodied Water, L/kg 1040
340

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
34
Resilience: Unit (Modulus of Resilience), kJ/m3 31
53
Stiffness to Weight: Axial, points 14
6.6
Stiffness to Weight: Bending, points 50
18
Strength to Weight: Axial, points 12
7.3
Strength to Weight: Bending, points 19
9.6
Thermal Diffusivity, mm2/s 42
23
Thermal Shock Resistance, points 5.5
8.2

Alloy Composition

Aluminum (Al), % 83 to 87.4
0 to 0.0050
Antimony (Sb), % 0
0 to 0.25
Chromium (Cr), % 0 to 0.15
0
Copper (Cu), % 3.3 to 4.7
75 to 77
Iron (Fe), % 0 to 0.8
0 to 0.4
Lead (Pb), % 0
5.5 to 7.0
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0
Nickel (Ni), % 0
0 to 1.0
Phosphorus (P), % 0
0 to 1.5
Silicon (Si), % 9.3 to 10.7
0 to 0.0050
Sulfur (S), % 0
0 to 0.080
Tin (Sn), % 0
2.0 to 3.0
Zinc (Zn), % 0 to 0.2
13 to 17
Residuals, % 0
0 to 0.7