Annealed 90-platinum 10-iridium vs. Annealed R60901 Alloy
Both annealed 90-platinum 10-iridium and annealed R60901 alloy are otherwise unclassified metals. Both are furnished in the annealed condition. There are 15 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 annealed 90-platinum 10-iridium and the bottom bar is annealed R60901 alloy.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 98 |
| Elongation at Break, % | 34 | |
| 22 |
| Poisson's Ratio | 0.38 | |
| 0.34 |
| Shear Modulus, GPa | 74 | |
| 37 |
| Tensile Strength: Ultimate (UTS), MPa | 330 | |
| 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 100 | |
| 250 |
| Melting Completion (Liquidus), °C | 1830 | |
| 1870 |
| Specific Heat Capacity, J/kg-K | 130 | |
| 270 |
| Thermal Expansion, µm/m-K | 8.6 | |
| 6.3 |
Otherwise Unclassified Properties
| Density, g/cm3 | 22 | |
| 6.6 |
Common Calculations
| Stiffness to Weight: Axial, points | 5.3 | |
| 8.3 |
| Stiffness to Weight: Bending, points | 9.1 | |
| 23 |
| Strength to Weight: Axial, points | 4.2 | |
| 21 |
| Strength to Weight: Bending, points | 4.9 | |
| 21 |
| Thermal Shock Resistance, points | 13 | |
| 58 |
Alloy Composition
| Iridium (Ir), % | 9.5 to 10.5 | |
| 0 |
| Niobium (Nb), % | 0 | |
| 2.4 to 2.8 |
| Platinum (Pt), % | 89.3 to 90.5 | |
| 0 |
| Zirconium (Zr), % | 0 | |
| 96.8 to 97.5 |
| Residuals, % | 0 | |
| 0 to 0.29 |