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R30021 Cobalt vs. EN AC-43000 Aluminum

R30021 cobalt belongs to the cobalt alloys classification, while EN AC-43000 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-43000 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
71
Elongation at Break, % 9.0
1.1 to 2.5
Fatigue Strength, MPa 250
68 to 76
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
27
Tensile Strength: Ultimate (UTS), MPa 700
180 to 270
Tensile Strength: Yield (Proof), MPa 500
97 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
900
Thermal Conductivity, W/m-K 15
140
Thermal Expansion, µm/m-K 11
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
38
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
130

Otherwise Unclassified Properties

Density, g/cm3 8.4
2.6
Embodied Carbon, kg CO2/kg material 8.0
7.8
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 520
1070

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
2.9 to 5.7
Resilience: Unit (Modulus of Resilience), kJ/m3 570
66 to 360
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
54
Strength to Weight: Axial, points 23
20 to 29
Strength to Weight: Bending, points 21
28 to 36
Thermal Diffusivity, mm2/s 3.8
60
Thermal Shock Resistance, points 21
8.6 to 12

Alloy Composition


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Aluminum (Al), % 0
87 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 0.55
Lead (Pb), % 0
0 to 0.050
Magnesium (Mg), % 0
0.2 to 0.45
Manganese (Mn), % 0
0 to 0.45
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0 to 0.050
Silicon (Si), % 0 to 1.5
9.0 to 11
Tin (Sn), % 0
0 to 0.050
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15