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C84400 Valve Metal vs. 8021 Aluminum

C84400 valve metal belongs to the copper alloys classification, while 8021 aluminum belongs to the aluminum 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 C84400 valve metal and the bottom bar is 8021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
70
Elongation at Break, % 19
2.3
Poisson's Ratio 0.34
0.33
Shear Modulus, GPa 39
26
Tensile Strength: Ultimate (UTS), MPa 230
160
Tensile Strength: Yield (Proof), MPa 110
130

Thermal Properties

Latent Heat of Fusion, J/g 180
400
Maximum Temperature: Mechanical, °C 160
170
Melting Completion (Liquidus), °C 1000
650
Melting Onset (Solidus), °C 840
640
Specific Heat Capacity, J/kg-K 370
900
Thermal Conductivity, W/m-K 72
220
Thermal Expansion, µm/m-K 19
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 16
56
Electrical Conductivity: Equal Weight (Specific), % IACS 17
180

Otherwise Unclassified Properties

Base Metal Price, % relative 29
9.0
Density, g/cm3 8.8
2.8
Embodied Carbon, kg CO2/kg material 2.8
8.1
Embodied Energy, MJ/kg 46
150
Embodied Water, L/kg 340
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 36
3.4
Resilience: Unit (Modulus of Resilience), kJ/m3 58
130
Stiffness to Weight: Axial, points 6.6
14
Stiffness to Weight: Bending, points 18
49
Strength to Weight: Axial, points 7.2
16
Strength to Weight: Bending, points 9.4
23
Thermal Diffusivity, mm2/s 22
88
Thermal Shock Resistance, points 8.3
7.0

Alloy Composition

Aluminum (Al), % 0 to 0.0050
98 to 98.8
Antimony (Sb), % 0 to 0.25
0
Copper (Cu), % 78 to 82
0 to 0.050
Iron (Fe), % 0 to 0.4
1.2 to 1.7
Lead (Pb), % 6.0 to 8.0
0
Nickel (Ni), % 0 to 1.0
0
Phosphorus (P), % 0 to 1.5
0
Silicon (Si), % 0 to 0.0050
0 to 0.15
Sulfur (S), % 0 to 0.080
0
Tin (Sn), % 2.3 to 3.5
0
Zinc (Zn), % 7.0 to 10
0
Residuals, % 0
0 to 0.15