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R31538 Cobalt vs. 851.0 Aluminum

R31538 cobalt belongs to the cobalt alloys classification, while 851.0 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 851.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
69
Elongation at Break, % 13 to 23
3.9 to 9.1
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
26
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
130 to 140

Thermal Properties

Latent Heat of Fusion, J/g 320
410
Melting Completion (Liquidus), °C 1360
630
Melting Onset (Solidus), °C 1290
360
Specific Heat Capacity, J/kg-K 450
850
Thermal Conductivity, W/m-K 13
180
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
46
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
140

Otherwise Unclassified Properties

Density, g/cm3 8.4
3.1
Embodied Carbon, kg CO2/kg material 8.1
8.4
Embodied Energy, MJ/kg 110
160
Embodied Water, L/kg 530
1140

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
45
Strength to Weight: Axial, points 34 to 45
12 to 13
Strength to Weight: Bending, points 27 to 32
19 to 20
Thermal Diffusivity, mm2/s 3.5
69
Thermal Shock Resistance, points 25 to 33
6.1 to 6.3

Alloy Composition


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Aluminum (Al), % 0
86.6 to 91.5
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
0.7 to 1.3
Iron (Fe), % 0 to 0.75
0 to 0.7
Magnesium (Mg), % 0
0 to 0.1
Manganese (Mn), % 0 to 1.0
0 to 0.1
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0.3 to 0.7
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
2.0 to 3.0
Tin (Sn), % 0
5.5 to 7.0
Titanium (Ti), % 0
0 to 0.2
Residuals, % 0
0 to 0.3