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R30816 Cobalt vs. 7108A Aluminum

R30816 cobalt belongs to the cobalt alloys classification, while 7108A 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 7108A aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
69
Elongation at Break, % 23
11 to 13
Fatigue Strength, MPa 250
120 to 130
Poisson's Ratio 0.3
0.33
Shear Modulus, GPa 81
26
Tensile Strength: Ultimate (UTS), MPa 1020
350
Tensile Strength: Yield (Proof), MPa 460
290 to 300

Thermal Properties

Latent Heat of Fusion, J/g 300
380
Melting Completion (Liquidus), °C 1540
630
Melting Onset (Solidus), °C 1460
520
Specific Heat Capacity, J/kg-K 420
870
Thermal Conductivity, W/m-K 13
150
Thermal Expansion, µm/m-K 12
24

Otherwise Unclassified Properties

Density, g/cm3 9.1
2.9
Embodied Carbon, kg CO2/kg material 20
8.3
Embodied Energy, MJ/kg 320
150
Embodied Water, L/kg 440
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
38 to 44
Resilience: Unit (Modulus of Resilience), kJ/m3 510
610 to 640
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 22
47
Strength to Weight: Axial, points 31
33 to 34
Strength to Weight: Bending, points 25
38
Thermal Diffusivity, mm2/s 3.3
59
Thermal Shock Resistance, points 28
15 to 16

Alloy Composition

Aluminum (Al), % 0
91.6 to 94.4
Carbon (C), % 0.32 to 0.42
0
Chromium (Cr), % 19 to 21
0 to 0.040
Cobalt (Co), % 40 to 49.8
0
Copper (Cu), % 0
0 to 0.050
Gallium (Ga), % 0
0 to 0.030
Iron (Fe), % 0 to 5.0
0 to 0.3
Magnesium (Mg), % 0
0.7 to 1.5
Manganese (Mn), % 1.0 to 2.0
0 to 0.050
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 0.2
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 3.5 to 4.5
0
Titanium (Ti), % 0
0 to 0.030
Tungsten (W), % 3.5 to 4.5
0
Zinc (Zn), % 0
4.8 to 5.8
Zirconium (Zr), % 0
0.15 to 0.25
Residuals, % 0
0 to 0.15