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R31538 Cobalt vs. A242.0 Aluminum

R31538 cobalt belongs to the cobalt alloys classification, while A242.0 aluminum belongs to the aluminum alloys. There are 23 material properties with values for both materials. Properties with values for just one material (9, 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 A242.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
73
Elongation at Break, % 13 to 23
1.6
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
27
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
220

Thermal Properties

Latent Heat of Fusion, J/g 320
390
Melting Completion (Liquidus), °C 1360
680
Melting Onset (Solidus), °C 1290
550
Specific Heat Capacity, J/kg-K 450
870
Thermal Conductivity, W/m-K 13
140
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
37
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
110

Otherwise Unclassified Properties

Density, g/cm3 8.4
3.1
Embodied Carbon, kg CO2/kg material 8.1
8.3
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 530
1130

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
45
Strength to Weight: Axial, points 34 to 45
20
Strength to Weight: Bending, points 27 to 32
26
Thermal Diffusivity, mm2/s 3.5
52
Thermal Shock Resistance, points 25 to 33
9.3

Alloy Composition


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Aluminum (Al), % 0
89.3 to 93.1
Carbon (C), % 0.15 to 0.35
0
Chromium (Cr), % 26 to 30
0.15 to 0.25
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
3.7 to 4.5
Iron (Fe), % 0 to 0.75
0 to 0.8
Magnesium (Mg), % 0
1.2 to 1.7
Manganese (Mn), % 0 to 1.0
0 to 0.1
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
1.8 to 2.3
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
0 to 0.6
Titanium (Ti), % 0
0.070 to 0.2
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15