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7021 Aluminum vs. C84400 Valve Metal

7021 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 (2, 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 7021 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, % 9.4
19
Poisson's Ratio 0.32
0.34
Shear Modulus, GPa 26
39
Tensile Strength: Ultimate (UTS), MPa 460
230
Tensile Strength: Yield (Proof), MPa 390
110

Thermal Properties

Latent Heat of Fusion, J/g 380
180
Maximum Temperature: Mechanical, °C 200
160
Melting Completion (Liquidus), °C 630
1000
Melting Onset (Solidus), °C 510
840
Specific Heat Capacity, J/kg-K 870
370
Thermal Conductivity, W/m-K 150
72
Thermal Expansion, µm/m-K 24
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
16
Electrical Conductivity: Equal Weight (Specific), % IACS 120
17

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
29
Density, g/cm3 2.9
8.8
Embodied Carbon, kg CO2/kg material 8.3
2.8
Embodied Energy, MJ/kg 150
46
Embodied Water, L/kg 1140
340

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
36
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
58
Stiffness to Weight: Axial, points 13
6.6
Stiffness to Weight: Bending, points 47
18
Strength to Weight: Axial, points 44
7.2
Strength to Weight: Bending, points 45
9.4
Thermal Diffusivity, mm2/s 59
22
Thermal Shock Resistance, points 20
8.3

Alloy Composition

Aluminum (Al), % 90.7 to 93.7
0 to 0.0050
Antimony (Sb), % 0
0 to 0.25
Chromium (Cr), % 0 to 0.050
0
Copper (Cu), % 0 to 0.25
78 to 82
Iron (Fe), % 0 to 0.4
0 to 0.4
Lead (Pb), % 0
6.0 to 8.0
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.1
0
Nickel (Ni), % 0
0 to 1.0
Phosphorus (P), % 0
0 to 1.5
Silicon (Si), % 0 to 0.25
0 to 0.0050
Sulfur (S), % 0
0 to 0.080
Tin (Sn), % 0
2.3 to 3.5
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 5.0 to 6.0
7.0 to 10
Zirconium (Zr), % 0.080 to 0.18
0
Residuals, % 0
0 to 0.7