R30008 Cobalt vs. EN AC-21200 Aluminum
R30008 cobalt belongs to the cobalt alloys classification, while EN AC-21200 aluminum belongs to the aluminum alloys. There are 23 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 R30008 cobalt and the bottom bar is EN AC-21200 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 71 |
| Elongation at Break, % | 1.1 to 73 | |
| 3.9 to 6.2 |
| Fatigue Strength, MPa | 320 to 530 | |
| 110 to 130 |
| Poisson's Ratio | 0.29 | |
| 0.33 |
| Shear Modulus, GPa | 83 | |
| 27 |
| Tensile Strength: Ultimate (UTS), MPa | 950 to 1700 | |
| 410 to 440 |
| Tensile Strength: Yield (Proof), MPa | 500 to 1080 | |
| 270 to 360 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 390 |
| Melting Completion (Liquidus), °C | 1400 | |
| 660 |
| Melting Onset (Solidus), °C | 1330 | |
| 550 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 880 |
| Thermal Expansion, µm/m-K | 13 | |
| 23 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 95 | |
| 10 |
| Density, g/cm3 | 8.4 | |
| 3.0 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 8.0 |
| Embodied Energy, MJ/kg | 110 | |
| 150 |
| Embodied Water, L/kg | 400 | |
| 1150 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 590 to 2720 | |
| 500 to 930 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 46 |
| Strength to Weight: Axial, points | 31 to 56 | |
| 38 to 40 |
| Strength to Weight: Bending, points | 25 to 37 | |
| 41 to 43 |
| Thermal Shock Resistance, points | 25 to 44 | |
| 18 to 19 |
Alloy Composition
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| Aluminum (Al), % | 0 | |
| 93.3 to 95.7 |
| Boron (B), % | 0 to 0.0010 | |
| 0 |
| Carbon (C), % | 0 to 0.15 | |
| 0 |
| Chromium (Cr), % | 18.5 to 21.5 | |
| 0 |
| Cobalt (Co), % | 39 to 42 | |
| 0 |
| Copper (Cu), % | 0 | |
| 4.0 to 5.0 |
| Iron (Fe), % | 7.6 to 20 | |
| 0 to 0.2 |
| Lead (Pb), % | 0 | |
| 0 to 0.030 |
| Magnesium (Mg), % | 0 | |
| 0.15 to 0.5 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0.2 to 0.5 |
| Molybdenum (Mo), % | 6.5 to 7.5 | |
| 0 |
| Nickel (Ni), % | 15 to 18 | |
| 0 to 0.050 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 |
| Silicon (Si), % | 0 to 1.2 | |
| 0 to 0.1 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 |
| Tin (Sn), % | 0 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 | |
| 0 to 0.1 |
| Zinc (Zn), % | 0 | |
| 0 to 0.1 |
| Residuals, % | 0 | |
| 0 to 0.1 |