Work Hardened 85-platinum 15-iridium vs. Work Hardened ASTM B685 Alloy
Both work hardened 85-platinum 15-iridium and work hardened ASTM B685 alloy are otherwise unclassified metals. Both are furnished in the cold worked (strain hardened) condition. There are 17 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.
For each property being compared, the top bar is work hardened 85-platinum 15-iridium and the bottom bar is work hardened ASTM B685 alloy.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 120 |
| Poisson's Ratio | 0.38 | |
| 0.37 |
| Shear Modulus, GPa | 81 | |
| 43 |
| Tensile Strength: Ultimate (UTS), MPa | 730 | |
| 1060 |
Thermal Properties
| Latent Heat of Fusion, J/g | 110 | |
| 180 |
| Melting Completion (Liquidus), °C | 1820 | |
| 1230 |
| Melting Onset (Solidus), °C | 1790 | |
| 1200 |
| Specific Heat Capacity, J/kg-K | 130 | |
| 300 |
| Thermal Expansion, µm/m-K | 8.4 | |
| 14 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 6.2 | |
| 5.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.6 | |
| 4.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 22 | |
| 11 |
Common Calculations
| Stiffness to Weight: Axial, points | 5.7 | |
| 6.1 |
| Stiffness to Weight: Bending, points | 9.3 | |
| 15 |
| Strength to Weight: Axial, points | 9.3 | |
| 27 |
| Strength to Weight: Bending, points | 8.3 | |
| 21 |
| Thermal Shock Resistance, points | 28 | |
| 46 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.0050 |
| Cadmium (Cd), % | 0 | |
| 0 to 0.050 |
| Copper (Cu), % | 0 | |
| 39.5 to 40.5 |
| Iridium (Ir), % | 14.5 to 15.5 | |
| 0 |
| Iron (Fe), % | 0 | |
| 0 to 0.050 |
| Lead (Pb), % | 0 | |
| 0 to 0.030 |
| Palladium (Pd), % | 0 | |
| 59 to 60.5 |
| Platinum (Pt), % | 84.3 to 85.5 | |
| 0 |
| Silver (Ag), % | 0 | |
| 0 to 0.1 |
| Zinc (Zn), % | 0 | |
| 0 to 0.060 |
| Residuals, % | 0 | |
| 0 to 0.2 |