Nuclear Grade Hafnium vs. R31537 Cobalt
Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while R31537 cobalt belongs to the cobalt alloys. There are 17 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.
For each property being compared, the top bar is nuclear grade hafnium and the bottom bar is R31537 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 78 | |
| 220 |
| Elongation at Break, % | 25 | |
| 14 to 23 |
| Poisson's Ratio | 0.26 | |
| 0.29 |
| Shear Modulus, GPa | 31 | |
| 87 |
| Tensile Strength: Ultimate (UTS), MPa | 350 | |
| 1000 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 170 | |
| 590 to 940 |
Thermal Properties
| Latent Heat of Fusion, J/g | 130 | |
| 320 |
| Specific Heat Capacity, J/kg-K | 140 | |
| 450 |
| Thermal Expansion, µm/m-K | 5.9 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 13 | |
| 8.4 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 73 | |
| 140 to 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 180 | |
| 780 to 1990 |
| Stiffness to Weight: Axial, points | 3.3 | |
| 15 |
| Stiffness to Weight: Bending, points | 11 | |
| 24 |
| Strength to Weight: Axial, points | 7.4 | |
| 33 to 44 |
| Strength to Weight: Bending, points | 8.4 | |
| 26 to 32 |
| Thermal Shock Resistance, points | 55 | |
| 24 to 32 |
Alloy Composition
| Carbon (C), % | 0 | |
| 0 to 0.14 |
| Chromium (Cr), % | 0 | |
| 26 to 30 |
| Cobalt (Co), % | 0 | |
| 58.9 to 69 |
| Hafnium (Hf), % | 99.8 to 100 | |
| 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 |
| Silicon (Si), % | 0 | |
| 0 to 1.0 |
| Residuals, % | 0 to 0.23 | |
| 0 |