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R31233 Cobalt vs. 6081 Aluminum

R31233 cobalt belongs to the cobalt alloys classification, while 6081 aluminum belongs to the aluminum alloys. There are 27 material properties with values for both materials. Properties with values for just one material (3, 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 R31233 cobalt and the bottom bar is 6081 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
69
Elongation at Break, % 17
9.0
Fatigue Strength, MPa 220
110
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 85
26
Tensile Strength: Ultimate (UTS), MPa 1020
310
Tensile Strength: Yield (Proof), MPa 420
270

Thermal Properties

Latent Heat of Fusion, J/g 320
410
Melting Completion (Liquidus), °C 1350
640
Melting Onset (Solidus), °C 1330
610
Specific Heat Capacity, J/kg-K 440
900
Thermal Conductivity, W/m-K 12
180
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
47
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
160

Otherwise Unclassified Properties

Density, g/cm3 8.6
2.7
Embodied Carbon, kg CO2/kg material 8.4
8.3
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 480
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
27
Resilience: Unit (Modulus of Resilience), kJ/m3 410
540
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
50
Strength to Weight: Axial, points 33
32
Strength to Weight: Bending, points 26
37
Thermal Diffusivity, mm2/s 3.2
74
Thermal Shock Resistance, points 25
14

Alloy Composition


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Aluminum (Al), % 0
96.3 to 98.6
Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0
Chromium (Cr), % 23.5 to 27.5
0 to 0.1
Cobalt (Co), % 44.7 to 63.3
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 1.0 to 5.0
0 to 0.5
Magnesium (Mg), % 0
0.6 to 1.0
Manganese (Mn), % 0.1 to 1.5
0.1 to 0.45
Molybdenum (Mo), % 4.0 to 6.0
0
Nickel (Ni), % 7.0 to 11
0
Nitrogen (N), % 0.030 to 0.12
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.050 to 1.0
0.7 to 1.1
Sulfur (S), % 0 to 0.020
0
Titanium (Ti), % 0
0 to 0.15
Tungsten (W), % 1.0 to 3.0
0
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15