AWS BCo-1 vs. 2218 Aluminum
AWS BCo-1 belongs to the cobalt alloys classification, while 2218 aluminum belongs to the aluminum alloys. There are 18 material properties with values for both materials. Properties with values for just one material (14, 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 AWS BCo-1 and the bottom bar is 2218 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 73 |
| Poisson's Ratio | 0.3 | |
| 0.33 |
| Shear Modulus, GPa | 78 | |
| 27 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 330 to 430 |
Thermal Properties
| Latent Heat of Fusion, J/g | 420 | |
| 390 |
| Melting Completion (Liquidus), °C | 1150 | |
| 640 |
| Melting Onset (Solidus), °C | 1120 | |
| 510 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 870 |
| Thermal Expansion, µm/m-K | 12 | |
| 22 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.1 | |
| 3.1 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 8.2 |
| Embodied Energy, MJ/kg | 110 | |
| 150 |
| Embodied Water, L/kg | 430 | |
| 1130 |
Common Calculations
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 45 |
| Strength to Weight: Axial, points | 24 | |
| 30 to 39 |
| Strength to Weight: Bending, points | 22 | |
| 34 to 41 |
| Thermal Shock Resistance, points | 21 | |
| 15 to 19 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.050 | |
| 88.8 to 93.6 |
| Boron (B), % | 0.7 to 0.9 | |
| 0 |
| Carbon (C), % | 0.35 to 0.45 | |
| 0 |
| Chromium (Cr), % | 18 to 20 | |
| 0 to 0.1 |
| Cobalt (Co), % | 46 to 54 | |
| 0 |
| Copper (Cu), % | 0 | |
| 3.5 to 4.5 |
| Iron (Fe), % | 0 to 1.0 | |
| 0 to 1.0 |
| Magnesium (Mg), % | 0 | |
| 1.2 to 1.8 |
| Manganese (Mn), % | 0 | |
| 0 to 0.2 |
| Nickel (Ni), % | 16 to 18 | |
| 1.7 to 2.3 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 |
| Selenium (Se), % | 0 to 0.0050 | |
| 0 |
| Silicon (Si), % | 7.5 to 8.5 | |
| 0 to 0.9 |
| Sulfur (S), % | 0 to 0.020 | |
| 0 |
| Titanium (Ti), % | 0 to 0.050 | |
| 0 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0 to 0.25 |
| Zirconium (Zr), % | 0 to 0.050 | |
| 0 |
| Residuals, % | 0 | |
| 0 to 0.15 |