R30021 Cobalt vs. 390.0 Aluminum
R30021 cobalt belongs to the cobalt alloys classification, while 390.0 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 390.0 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 75 |
| Elongation at Break, % | 9.0 | |
| 1.0 |
| Fatigue Strength, MPa | 250 | |
| 76 to 110 |
| Poisson's Ratio | 0.29 | |
| 0.33 |
| Shear Modulus, GPa | 86 | |
| 28 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 280 to 300 |
| Tensile Strength: Yield (Proof), MPa | 500 | |
| 240 to 270 |
Thermal Properties
| Latent Heat of Fusion, J/g | 330 | |
| 640 |
| Melting Completion (Liquidus), °C | 1350 | |
| 650 |
| Melting Onset (Solidus), °C | 1190 | |
| 560 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 880 |
| Thermal Conductivity, W/m-K | 15 | |
| 130 |
| Thermal Expansion, µm/m-K | 11 | |
| 18 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.9 | |
| 24 to 25 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 79 to 83 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 2.7 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 7.3 |
| Embodied Energy, MJ/kg | 110 | |
| 130 |
| Embodied Water, L/kg | 520 | |
| 950 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 57 | |
| 2.7 to 2.9 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 570 | |
| 380 to 470 |
| Stiffness to Weight: Axial, points | 15 | |
| 15 |
| Stiffness to Weight: Bending, points | 24 | |
| 52 |
| Strength to Weight: Axial, points | 23 | |
| 28 to 30 |
| Strength to Weight: Bending, points | 21 | |
| 35 to 36 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 56 |
| Thermal Shock Resistance, points | 21 | |
| 14 to 15 |
Alloy Composition
Deprecated: Automatic conversion of false to array is deprecated in /home/public/compare.php on line 460
| Aluminum (Al), % | 0 | |
| 74.5 to 79.6 |
| 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 | |
| 4.0 to 5.0 |
| Iron (Fe), % | 0 to 3.0 | |
| 0 to 1.3 |
| Magnesium (Mg), % | 0 | |
| 0.45 to 0.65 |
| 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 | |
| 16 to 18 |
| Titanium (Ti), % | 0 | |
| 0 to 0.2 |
| Zinc (Zn), % | 0 | |
| 0 to 0.1 |
| Residuals, % | 0 | |
| 0 to 0.2 |