851.0 Aluminum vs. R30035 Cobalt
851.0 aluminum belongs to the aluminum alloys classification, while R30035 cobalt belongs to the cobalt alloys. There are 24 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 851.0 aluminum and the bottom bar is R30035 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 69 | |
| 220 to 230 |
| Elongation at Break, % | 3.9 to 9.1 | |
| 9.0 to 46 |
| Poisson's Ratio | 0.33 | |
| 0.29 |
| Shear Modulus, GPa | 26 | |
| 84 to 89 |
| Tensile Strength: Ultimate (UTS), MPa | 130 to 140 | |
| 900 to 1900 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 320 |
| Melting Completion (Liquidus), °C | 630 | |
| 1440 |
| Melting Onset (Solidus), °C | 360 | |
| 1320 |
| Specific Heat Capacity, J/kg-K | 850 | |
| 440 |
| Thermal Conductivity, W/m-K | 180 | |
| 11 |
| Thermal Expansion, µm/m-K | 23 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 46 | |
| 1.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 140 | |
| 1.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 14 | |
| 100 |
| Density, g/cm3 | 3.1 | |
| 8.7 |
| Embodied Carbon, kg CO2/kg material | 8.4 | |
| 10 |
| Embodied Energy, MJ/kg | 160 | |
| 140 |
| Embodied Water, L/kg | 1140 | |
| 410 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 14 to 15 |
| Stiffness to Weight: Bending, points | 45 | |
| 23 to 24 |
| Strength to Weight: Axial, points | 12 to 13 | |
| 29 to 61 |
| Strength to Weight: Bending, points | 19 to 20 | |
| 24 to 39 |
| Thermal Diffusivity, mm2/s | 69 | |
| 3.0 |
| Thermal Shock Resistance, points | 6.1 to 6.3 | |
| 23 to 46 |
Alloy Composition
| Aluminum (Al), % | 86.6 to 91.5 | |
| 0 |
| Boron (B), % | 0 | |
| 0 to 0.015 |
| Carbon (C), % | 0 | |
| 0 to 0.025 |
| Chromium (Cr), % | 0 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 29.1 to 39 |
| Copper (Cu), % | 0.7 to 1.3 | |
| 0 |
| Iron (Fe), % | 0 to 0.7 | |
| 0 to 1.0 |
| Magnesium (Mg), % | 0 to 0.1 | |
| 0 |
| Manganese (Mn), % | 0 to 0.1 | |
| 0 to 0.15 |
| Molybdenum (Mo), % | 0 | |
| 9.0 to 10.5 |
| Nickel (Ni), % | 0.3 to 0.7 | |
| 33 to 37 |
| Phosphorus (P), % | 0 | |
| 0 to 0.015 |
| Silicon (Si), % | 2.0 to 3.0 | |
| 0 to 0.15 |
| Sulfur (S), % | 0 | |
| 0 to 0.010 |
| Tin (Sn), % | 5.5 to 7.0 | |
| 0 |
| Titanium (Ti), % | 0 to 0.2 | |
| 0 to 1.0 |
| Residuals, % | 0 to 0.3 | |
| 0 |