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R30816 Cobalt vs. 7178 Aluminum

R30816 cobalt belongs to the cobalt alloys classification, while 7178 aluminum belongs to the aluminum alloys. There are 25 material properties with values for both materials. Properties with values for just one material (7, 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 R30816 cobalt and the bottom bar is 7178 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
71
Elongation at Break, % 23
4.5 to 12
Fatigue Strength, MPa 250
120 to 210
Poisson's Ratio 0.3
0.32
Shear Modulus, GPa 81
27
Tensile Strength: Ultimate (UTS), MPa 1020
240 to 640
Tensile Strength: Yield (Proof), MPa 460
120 to 560

Thermal Properties

Latent Heat of Fusion, J/g 300
370
Melting Completion (Liquidus), °C 1540
630
Melting Onset (Solidus), °C 1460
480
Specific Heat Capacity, J/kg-K 420
860
Thermal Conductivity, W/m-K 13
130
Thermal Expansion, µm/m-K 12
23

Otherwise Unclassified Properties

Density, g/cm3 9.1
3.1
Embodied Carbon, kg CO2/kg material 20
8.2
Embodied Energy, MJ/kg 320
150
Embodied Water, L/kg 440
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
24 to 52
Resilience: Unit (Modulus of Resilience), kJ/m3 510
110 to 2220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 22
45
Strength to Weight: Axial, points 31
21 to 58
Strength to Weight: Bending, points 25
28 to 54
Thermal Diffusivity, mm2/s 3.3
47
Thermal Shock Resistance, points 28
10 to 28

Alloy Composition

Aluminum (Al), % 0
85.4 to 89.5
Carbon (C), % 0.32 to 0.42
0
Chromium (Cr), % 19 to 21
0.18 to 0.28
Cobalt (Co), % 40 to 49.8
0
Copper (Cu), % 0
1.6 to 2.4
Iron (Fe), % 0 to 5.0
0 to 0.5
Magnesium (Mg), % 0
2.4 to 3.1
Manganese (Mn), % 1.0 to 2.0
0 to 0.3
Molybdenum (Mo), % 3.5 to 4.5
0
Nickel (Ni), % 19 to 21
0
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 3.5 to 4.5
0
Titanium (Ti), % 0
0 to 0.2
Tungsten (W), % 3.5 to 4.5
0
Zinc (Zn), % 0
6.3 to 7.3
Residuals, % 0
0 to 0.15