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R31538 Cobalt vs. A206.0 Aluminum

R31538 cobalt belongs to the cobalt alloys classification, while A206.0 aluminum belongs to the aluminum alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, 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 R31538 cobalt and the bottom bar is A206.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
70
Elongation at Break, % 13 to 23
4.2 to 10
Fatigue Strength, MPa 310 to 480
90 to 180
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
26
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
390 to 440
Tensile Strength: Yield (Proof), MPa 580 to 930
250 to 380

Thermal Properties

Latent Heat of Fusion, J/g 320
390
Melting Completion (Liquidus), °C 1360
670
Melting Onset (Solidus), °C 1290
550
Specific Heat Capacity, J/kg-K 450
880
Thermal Conductivity, W/m-K 13
130
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
30
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
90

Otherwise Unclassified Properties

Density, g/cm3 8.4
3.0
Embodied Carbon, kg CO2/kg material 8.1
8.0
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 530
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
16 to 37
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
440 to 1000
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
46
Strength to Weight: Axial, points 34 to 45
36 to 41
Strength to Weight: Bending, points 27 to 32
39 to 43
Thermal Diffusivity, mm2/s 3.5
48
Thermal Shock Resistance, points 25 to 33
17 to 19

Alloy Composition


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Aluminum (Al), % 0
93.9 to 95.7
Carbon (C), % 0.15 to 0.35
0
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
4.2 to 5.0
Iron (Fe), % 0 to 0.75
0 to 0.1
Magnesium (Mg), % 0
0 to 0.15
Manganese (Mn), % 0 to 1.0
0 to 0.2
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0 to 0.050
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
0 to 0.050
Tin (Sn), % 0
0 to 0.050
Titanium (Ti), % 0
0.15 to 0.3
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15