90-platinum 10-iridium vs. R31538 Cobalt
90-platinum 10-iridium belongs to the otherwise unclassified metals classification, while R31538 cobalt belongs to the cobalt alloys. There are 14 material properties with values for both materials. Properties with values for just one material (16, 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 90-platinum 10-iridium and the bottom bar is R31538 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 220 |
| Elongation at Break, % | 5.5 to 34 | |
| 13 to 23 |
| Poisson's Ratio | 0.38 | |
| 0.29 |
| Shear Modulus, GPa | 74 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 330 to 550 | |
| 1020 to 1360 |
Thermal Properties
| Latent Heat of Fusion, J/g | 100 | |
| 320 |
| Specific Heat Capacity, J/kg-K | 130 | |
| 450 |
| Thermal Expansion, µm/m-K | 8.6 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 22 | |
| 8.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 5.3 | |
| 15 |
| Stiffness to Weight: Bending, points | 9.1 | |
| 24 |
| Strength to Weight: Axial, points | 4.2 to 7.1 | |
| 34 to 45 |
| Strength to Weight: Bending, points | 4.9 to 6.9 | |
| 27 to 32 |
| Thermal Shock Resistance, points | 13 to 22 | |
| 25 to 33 |
Alloy Composition
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| Carbon (C), % | 0 | |
| 0.15 to 0.35 |
| Chromium (Cr), % | 0 | |
| 26 to 30 |
| Cobalt (Co), % | 0 | |
| 58.7 to 68.9 |
| Iridium (Ir), % | 9.5 to 10.5 | |
| 0 |
| Iron (Fe), % | 0 | |
| 0 to 0.75 |
| Manganese (Mn), % | 0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 0 | |
| 0 to 1.0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.25 |
| Platinum (Pt), % | 89.3 to 90.5 | |
| 0 |
| Silicon (Si), % | 0 | |
| 0 to 1.0 |
| Residuals, % | 0 to 0.2 | |
| 0 |