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8079 Aluminum vs. C84400 Valve Metal

8079 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 (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 8079 aluminum and the bottom bar is C84400 valve metal.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
100
Elongation at Break, % 2.2
19
Poisson's Ratio 0.33
0.34
Shear Modulus, GPa 26
39
Tensile Strength: Ultimate (UTS), MPa 150
230
Tensile Strength: Yield (Proof), MPa 120
110

Thermal Properties

Latent Heat of Fusion, J/g 400
180
Maximum Temperature: Mechanical, °C 170
160
Melting Completion (Liquidus), °C 650
1000
Melting Onset (Solidus), °C 640
840
Specific Heat Capacity, J/kg-K 900
370
Thermal Conductivity, W/m-K 230
72
Thermal Expansion, µm/m-K 23
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 58
16
Electrical Conductivity: Equal Weight (Specific), % IACS 190
17

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
29
Density, g/cm3 2.8
8.8
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: Ultimate (Unit Rupture Work), MJ/m3 3.1
36
Resilience: Unit (Modulus of Resilience), kJ/m3 110
58
Stiffness to Weight: Axial, points 14
6.6
Stiffness to Weight: Bending, points 50
18
Strength to Weight: Axial, points 15
7.2
Strength to Weight: Bending, points 22
9.4
Thermal Diffusivity, mm2/s 92
22
Thermal Shock Resistance, points 6.4
8.3

Alloy Composition

Aluminum (Al), % 98.1 to 99.3
0 to 0.0050
Antimony (Sb), % 0
0 to 0.25
Copper (Cu), % 0 to 0.050
78 to 82
Iron (Fe), % 0.7 to 1.3
0 to 0.4
Lead (Pb), % 0
6.0 to 8.0
Nickel (Ni), % 0
0 to 1.0
Phosphorus (P), % 0
0 to 1.5
Silicon (Si), % 0.050 to 0.3
0 to 0.0050
Sulfur (S), % 0
0 to 0.080
Tin (Sn), % 0
2.3 to 3.5
Zinc (Zn), % 0 to 0.1
7.0 to 10
Residuals, % 0
0 to 0.7