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R30021 Cobalt vs. 5050 Aluminum

R30021 cobalt belongs to the cobalt alloys classification, while 5050 aluminum belongs to the aluminum alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, 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 R30021 cobalt and the bottom bar is 5050 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
68
Elongation at Break, % 9.0
1.7 to 22
Fatigue Strength, MPa 250
45 to 100
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
26
Tensile Strength: Ultimate (UTS), MPa 700
140 to 250
Tensile Strength: Yield (Proof), MPa 500
50 to 210

Thermal Properties

Latent Heat of Fusion, J/g 330
400
Melting Completion (Liquidus), °C 1350
650
Melting Onset (Solidus), °C 1190
630
Specific Heat Capacity, J/kg-K 450
900
Thermal Conductivity, W/m-K 15
190
Thermal Expansion, µm/m-K 11
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
50
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
170

Otherwise Unclassified Properties

Density, g/cm3 8.4
2.7
Embodied Carbon, kg CO2/kg material 8.0
8.4
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 520
1190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
4.1 to 24
Resilience: Unit (Modulus of Resilience), kJ/m3 570
18 to 330
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
50
Strength to Weight: Axial, points 23
15 to 26
Strength to Weight: Bending, points 21
22 to 33
Thermal Diffusivity, mm2/s 3.8
79
Thermal Shock Resistance, points 21
6.3 to 11

Alloy Composition


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Aluminum (Al), % 0
96.3 to 98.9
Carbon (C), % 0.2 to 0.35
0
Chromium (Cr), % 26 to 29
0 to 0.1
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 0 to 3.0
0 to 0.7
Magnesium (Mg), % 0
1.1 to 1.8
Manganese (Mn), % 0
0 to 0.1
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Silicon (Si), % 0 to 1.5
0 to 0.4
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15