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R30021 Cobalt vs. EN AC-43300 Aluminum

R30021 cobalt belongs to the cobalt alloys classification, while EN AC-43300 aluminum belongs to the aluminum alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, 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 EN AC-43300 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
71
Elongation at Break, % 9.0
3.4 to 6.7
Fatigue Strength, MPa 250
76 to 77
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
27
Tensile Strength: Ultimate (UTS), MPa 700
280 to 290
Tensile Strength: Yield (Proof), MPa 500
210 to 230

Thermal Properties

Latent Heat of Fusion, J/g 330
540
Melting Completion (Liquidus), °C 1350
600
Melting Onset (Solidus), °C 1190
590
Specific Heat Capacity, J/kg-K 450
910
Thermal Conductivity, W/m-K 15
140
Thermal Expansion, µm/m-K 11
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
40
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
140

Otherwise Unclassified Properties

Density, g/cm3 8.4
2.5
Embodied Carbon, kg CO2/kg material 8.0
7.9
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 520
1080

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
9.1 to 17
Resilience: Unit (Modulus of Resilience), kJ/m3 570
300 to 370
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
54
Strength to Weight: Axial, points 23
31 to 32
Strength to Weight: Bending, points 21
37 to 38
Thermal Diffusivity, mm2/s 3.8
59
Thermal Shock Resistance, points 21
13 to 14

Alloy Composition


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Aluminum (Al), % 0
88.9 to 90.8
Carbon (C), % 0.2 to 0.35
0
Chromium (Cr), % 26 to 29
0
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 0.050
Iron (Fe), % 0 to 3.0
0 to 0.19
Magnesium (Mg), % 0
0.25 to 0.45
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
9.0 to 10
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0
0 to 0.070
Residuals, % 0
0 to 0.1