R31538 Cobalt vs. ISO-WD21150 Magnesium
R31538 cobalt belongs to the cobalt alloys classification, while ISO-WD21150 magnesium belongs to the magnesium alloys. There are 26 material properties with values for both materials. Properties with values for just one material (6, 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 R31538 cobalt and the bottom bar is ISO-WD21150 magnesium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 45 |
| Elongation at Break, % | 13 to 23 | |
| 5.7 to 11 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 86 | |
| 17 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
| 240 to 290 |
| Tensile Strength: Yield (Proof), MPa | 580 to 930 | |
| 120 to 200 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 350 |
| Melting Completion (Liquidus), °C | 1360 | |
| 600 |
| Melting Onset (Solidus), °C | 1290 | |
| 550 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 990 |
| Thermal Conductivity, W/m-K | 13 | |
| 100 |
| Thermal Expansion, µm/m-K | 13 | |
| 27 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 19 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 100 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 1.7 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 23 |
| Embodied Energy, MJ/kg | 110 | |
| 160 |
| Embodied Water, L/kg | 530 | |
| 980 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 200 | |
| 15 to 24 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 to 1920 | |
| 160 to 460 |
| Stiffness to Weight: Axial, points | 15 | |
| 15 |
| Stiffness to Weight: Bending, points | 24 | |
| 70 |
| Strength to Weight: Axial, points | 34 to 45 | |
| 40 to 48 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 52 to 58 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 60 |
| Thermal Shock Resistance, points | 25 to 33 | |
| 15 to 17 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 2.4 to 3.6 |
| Carbon (C), % | 0.15 to 0.35 | |
| 0 |
| Chromium (Cr), % | 26 to 30 | |
| 0 |
| Cobalt (Co), % | 58.7 to 68.9 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0 to 0.050 |
| Iron (Fe), % | 0 to 0.75 | |
| 0 to 0.0050 |
| Magnesium (Mg), % | 0 | |
| 94 to 97 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.15 to 0.4 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 0 |
| Nickel (Ni), % | 0 to 1.0 | |
| 0 to 0.0050 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.1 |
| Zinc (Zn), % | 0 | |
| 0.5 to 1.5 |
| Residuals, % | 0 | |
| 0 to 0.3 |