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R31538 Cobalt vs. C355.0 Aluminum

R31538 cobalt belongs to the cobalt alloys classification, while C355.0 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 C355.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
70
Elongation at Break, % 13 to 23
2.7 to 3.8
Fatigue Strength, MPa 310 to 480
76 to 84
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
26
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
290 to 310
Tensile Strength: Yield (Proof), MPa 580 to 930
200 to 230

Thermal Properties

Latent Heat of Fusion, J/g 320
470
Melting Completion (Liquidus), °C 1360
620
Melting Onset (Solidus), °C 1290
570
Specific Heat Capacity, J/kg-K 450
900
Thermal Conductivity, W/m-K 13
150
Thermal Expansion, µm/m-K 13
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
39
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
130

Otherwise Unclassified Properties

Density, g/cm3 8.4
2.7
Embodied Carbon, kg CO2/kg material 8.1
8.0
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 530
1120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
7.5 to 9.8
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
290 to 380
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
51
Strength to Weight: Axial, points 34 to 45
30 to 32
Strength to Weight: Bending, points 27 to 32
36 to 37
Thermal Diffusivity, mm2/s 3.5
60
Thermal Shock Resistance, points 25 to 33
13 to 14

Alloy Composition


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Aluminum (Al), % 0
91.7 to 94.1
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
1.0 to 1.5
Iron (Fe), % 0 to 0.75
0 to 0.2
Magnesium (Mg), % 0
0.4 to 0.6
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
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
4.5 to 5.5
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15