Annealed R31539 Cobalt vs. Annealed R05200 Tantalum
Annealed R31539 cobalt belongs to the cobalt alloys classification, while annealed R05200 tantalum belongs to the otherwise unclassified metals. There are 21 material properties with values for both materials. Properties with values for just one material (8, 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 annealed R31539 cobalt and the bottom bar is annealed R05200 tantalum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 190 |
| Elongation at Break, % | 22 | |
| 28 |
| Poisson's Ratio | 0.29 | |
| 0.34 |
| Shear Modulus, GPa | 86 | |
| 69 |
| Tensile Strength: Ultimate (UTS), MPa | 1000 | |
| 210 |
| Tensile Strength: Yield (Proof), MPa | 590 | |
| 140 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 140 |
| Melting Completion (Liquidus), °C | 1360 | |
| 3020 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 140 |
| Thermal Conductivity, W/m-K | 13 | |
| 59 |
| Thermal Expansion, µm/m-K | 13 | |
| 6.5 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 17 |
| Embodied Water, L/kg | 530 | |
| 650 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 53 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 780 | |
| 50 |
| Stiffness to Weight: Axial, points | 15 | |
| 6.2 |
| Stiffness to Weight: Bending, points | 24 | |
| 11 |
| Strength to Weight: Axial, points | 33 | |
| 3.6 |
| Strength to Weight: Bending, points | 27 | |
| 4.8 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 25 |
| Thermal Shock Resistance, points | 24 | |
| 13 |
Alloy Composition
| Aluminum (Al), % | 0.3 to 1.0 | |
| 0 |
| Carbon (C), % | 0 to 0.14 | |
| 0 to 0.010 |
| Chromium (Cr), % | 26 to 30 | |
| 0 |
| Cobalt (Co), % | 57.7 to 68.7 | |
| 0 |
| Hydrogen (H), % | 0 | |
| 0 to 0.0015 |
| Iron (Fe), % | 0 to 0.75 | |
| 0 to 0.010 |
| Lanthanum (La), % | 0.030 to 0.2 | |
| 0 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 0 to 0.020 |
| Nickel (Ni), % | 0 to 1.0 | |
| 0 to 0.010 |
| Niobium (Nb), % | 0 | |
| 0 to 0.1 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 to 0.010 |
| Oxygen (O), % | 0 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.0050 |
| Tantalum (Ta), % | 0 | |
| 99.8 to 100 |
| Titanium (Ti), % | 0 | |
| 0 to 0.010 |
| Tungsten (W), % | 0 | |
| 0 to 0.050 |