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7178 Aluminum vs. C84400 Valve Metal

7178 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 7178 aluminum and the bottom bar is C84400 valve metal.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 10
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 1110
340

Common Calculations

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

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0 to 0.0050
Antimony (Sb), % 0
0 to 0.25
Chromium (Cr), % 0.18 to 0.28
0
Copper (Cu), % 1.6 to 2.4
78 to 82
Iron (Fe), % 0 to 0.5
0 to 0.4
Lead (Pb), % 0
6.0 to 8.0
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0
Nickel (Ni), % 0
0 to 1.0
Phosphorus (P), % 0
0 to 1.5
Silicon (Si), % 0 to 0.4
0 to 0.0050
Sulfur (S), % 0
0 to 0.080
Tin (Sn), % 0
2.3 to 3.5
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
7.0 to 10
Residuals, % 0
0 to 0.7