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2218 Aluminum vs. C84400 Valve Metal

2218 aluminum belongs to the aluminum alloys classification, while C84400 valve metal 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 2218 aluminum and the bottom bar is C84400 valve metal.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
100
Elongation at Break, % 6.8 to 10
19
Poisson's Ratio 0.33
0.34
Shear Modulus, GPa 27
39
Tensile Strength: Ultimate (UTS), MPa 330 to 430
230
Tensile Strength: Yield (Proof), MPa 260 to 310
110

Thermal Properties

Latent Heat of Fusion, J/g 390
180
Maximum Temperature: Mechanical, °C 220
160
Melting Completion (Liquidus), °C 640
1000
Melting Onset (Solidus), °C 510
840
Specific Heat Capacity, J/kg-K 870
370
Thermal Conductivity, W/m-K 140
72
Thermal Expansion, µm/m-K 22
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
16
Electrical Conductivity: Equal Weight (Specific), % IACS 110
17

Otherwise Unclassified Properties

Base Metal Price, % relative 11
29
Density, g/cm3 3.1
8.8
Embodied Carbon, kg CO2/kg material 8.2
2.8
Embodied Energy, MJ/kg 150
46
Embodied Water, L/kg 1130
340

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27 to 31
36
Resilience: Unit (Modulus of Resilience), kJ/m3 450 to 650
58
Stiffness to Weight: Axial, points 13
6.6
Stiffness to Weight: Bending, points 45
18
Strength to Weight: Axial, points 30 to 39
7.2
Strength to Weight: Bending, points 34 to 41
9.4
Thermal Diffusivity, mm2/s 52
22
Thermal Shock Resistance, points 15 to 19
8.3

Alloy Composition

Aluminum (Al), % 88.8 to 93.6
0 to 0.0050
Antimony (Sb), % 0
0 to 0.25
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 3.5 to 4.5
78 to 82
Iron (Fe), % 0 to 1.0
0 to 0.4
Lead (Pb), % 0
6.0 to 8.0
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.2
0
Nickel (Ni), % 1.7 to 2.3
0 to 1.0
Phosphorus (P), % 0
0 to 1.5
Silicon (Si), % 0 to 0.9
0 to 0.0050
Sulfur (S), % 0
0 to 0.080
Tin (Sn), % 0
2.3 to 3.5
Zinc (Zn), % 0 to 0.25
7.0 to 10
Residuals, % 0
0 to 0.7