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C84400 Valve Metal vs. 7178 Aluminum

C84400 valve metal belongs to the copper alloys classification, while 7178 aluminum belongs to the aluminum 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 C84400 valve metal and the bottom bar is 7178 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
71
Elongation at Break, % 19
4.5 to 12
Poisson's Ratio 0.34
0.32
Shear Modulus, GPa 39
27
Tensile Strength: Ultimate (UTS), MPa 230
240 to 640
Tensile Strength: Yield (Proof), MPa 110
120 to 560

Thermal Properties

Latent Heat of Fusion, J/g 180
370
Maximum Temperature: Mechanical, °C 160
180
Melting Completion (Liquidus), °C 1000
630
Melting Onset (Solidus), °C 840
480
Specific Heat Capacity, J/kg-K 370
860
Thermal Conductivity, W/m-K 72
130
Thermal Expansion, µm/m-K 19
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 16
31
Electrical Conductivity: Equal Weight (Specific), % IACS 17
91

Otherwise Unclassified Properties

Base Metal Price, % relative 29
10
Density, g/cm3 8.8
3.1
Embodied Carbon, kg CO2/kg material 2.8
8.2
Embodied Energy, MJ/kg 46
150
Embodied Water, L/kg 340
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 36
24 to 52
Resilience: Unit (Modulus of Resilience), kJ/m3 58
110 to 2220
Stiffness to Weight: Axial, points 6.6
13
Stiffness to Weight: Bending, points 18
45
Strength to Weight: Axial, points 7.2
21 to 58
Strength to Weight: Bending, points 9.4
28 to 54
Thermal Diffusivity, mm2/s 22
47
Thermal Shock Resistance, points 8.3
10 to 28

Alloy Composition

Aluminum (Al), % 0 to 0.0050
85.4 to 89.5
Antimony (Sb), % 0 to 0.25
0
Chromium (Cr), % 0
0.18 to 0.28
Copper (Cu), % 78 to 82
1.6 to 2.4
Iron (Fe), % 0 to 0.4
0 to 0.5
Lead (Pb), % 6.0 to 8.0
0
Magnesium (Mg), % 0
2.4 to 3.1
Manganese (Mn), % 0
0 to 0.3
Nickel (Ni), % 0 to 1.0
0
Phosphorus (P), % 0 to 1.5
0
Silicon (Si), % 0 to 0.0050
0 to 0.4
Sulfur (S), % 0 to 0.080
0
Tin (Sn), % 2.3 to 3.5
0
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 7.0 to 10
6.3 to 7.3
Residuals, % 0
0 to 0.15