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4006 Aluminum vs. R31233 Cobalt

4006 aluminum belongs to the aluminum alloys classification, while R31233 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, 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 4006 aluminum and the bottom bar is R31233 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
220
Elongation at Break, % 3.4 to 24
17
Fatigue Strength, MPa 35 to 110
220
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
85
Tensile Strength: Ultimate (UTS), MPa 110 to 160
1020
Tensile Strength: Yield (Proof), MPa 62 to 140
420

Thermal Properties

Latent Heat of Fusion, J/g 410
320
Melting Completion (Liquidus), °C 640
1350
Melting Onset (Solidus), °C 620
1330
Specific Heat Capacity, J/kg-K 900
440
Thermal Conductivity, W/m-K 220
12
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 56
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 180
2.1

Otherwise Unclassified Properties

Density, g/cm3 2.7
8.6
Embodied Carbon, kg CO2/kg material 8.1
8.4
Embodied Energy, MJ/kg 150
110
Embodied Water, L/kg 1180
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.1 to 26
140
Resilience: Unit (Modulus of Resilience), kJ/m3 28 to 130
410
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
23
Strength to Weight: Axial, points 11 to 16
33
Strength to Weight: Bending, points 19 to 24
26
Thermal Diffusivity, mm2/s 89
3.2
Thermal Shock Resistance, points 4.9 to 7.0
25

Alloy Composition

Aluminum (Al), % 97.4 to 98.7
0
Boron (B), % 0
0 to 0.015
Carbon (C), % 0
0.020 to 0.1
Chromium (Cr), % 0 to 0.2
23.5 to 27.5
Cobalt (Co), % 0
44.7 to 63.3
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0.5 to 0.8
1.0 to 5.0
Magnesium (Mg), % 0 to 0.010
0
Manganese (Mn), % 0 to 0.050
0.1 to 1.5
Molybdenum (Mo), % 0
4.0 to 6.0
Nickel (Ni), % 0
7.0 to 11
Nitrogen (N), % 0
0.030 to 0.12
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0.8 to 1.2
0.050 to 1.0
Sulfur (S), % 0
0 to 0.020
Tungsten (W), % 0
1.0 to 3.0
Zinc (Zn), % 0 to 0.050
0
Residuals, % 0 to 0.15
0