R30075 Cobalt vs. EN AC-21200 Aluminum
R30075 cobalt belongs to the cobalt alloys classification, while EN AC-21200 aluminum belongs to the aluminum alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, 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 R30075 cobalt and the bottom bar is EN AC-21200 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 to 250 | |
| 71 |
| Elongation at Break, % | 12 | |
| 3.9 to 6.2 |
| Fatigue Strength, MPa | 250 to 840 | |
| 110 to 130 |
| Poisson's Ratio | 0.29 | |
| 0.33 |
| Shear Modulus, GPa | 82 to 98 | |
| 27 |
| Tensile Strength: Ultimate (UTS), MPa | 780 to 1280 | |
| 410 to 440 |
| Tensile Strength: Yield (Proof), MPa | 480 to 840 | |
| 270 to 360 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 390 |
| Melting Completion (Liquidus), °C | 1360 | |
| 660 |
| Melting Onset (Solidus), °C | 1290 | |
| 550 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 880 |
| Thermal Conductivity, W/m-K | 13 | |
| 130 |
| Thermal Expansion, µm/m-K | 12 | |
| 23 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 34 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 100 |
Otherwise Unclassified Properties
| 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 | 530 | |
| 1150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 to 140 | |
| 16 to 22 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 560 to 1410 | |
| 500 to 930 |
| Stiffness to Weight: Axial, points | 14 to 17 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 to 25 | |
| 46 |
| Strength to Weight: Axial, points | 26 to 42 | |
| 38 to 40 |
| Strength to Weight: Bending, points | 22 to 31 | |
| 41 to 43 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 49 |
| Thermal Shock Resistance, points | 21 to 29 | |
| 18 to 19 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.1 | |
| 93.3 to 95.7 |
| Boron (B), % | 0 to 0.010 | |
| 0 |
| Carbon (C), % | 0 to 0.35 | |
| 0 |
| Chromium (Cr), % | 27 to 30 | |
| 0 |
| Cobalt (Co), % | 58.7 to 68 | |
| 0 |
| Copper (Cu), % | 0 | |
| 4.0 to 5.0 |
| Iron (Fe), % | 0 to 0.75 | |
| 0 to 0.2 |
| Lead (Pb), % | 0 | |
| 0 to 0.030 |
| Magnesium (Mg), % | 0 | |
| 0.15 to 0.5 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.2 to 0.5 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 0 |
| Nickel (Ni), % | 0 to 0.5 | |
| 0 to 0.050 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.1 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 |
| Tin (Sn), % | 0 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 to 0.1 | |
| 0 to 0.1 |
| Tungsten (W), % | 0 to 0.2 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0 to 0.1 |
| Residuals, % | 0 | |
| 0 to 0.1 |