Reactor Grade Zirconium vs. Nuclear Grade Hafnium
Both reactor grade zirconium and nuclear grade hafnium are otherwise unclassified metals. Both are furnished in the annealed condition. There are 17 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is reactor grade zirconium and the bottom bar is nuclear grade hafnium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 98 | |
| 78 |
| Elongation at Break, % | 21 | |
| 25 |
| Poisson's Ratio | 0.34 | |
| 0.26 |
| Shear Modulus, GPa | 37 | |
| 31 |
| Tensile Strength: Ultimate (UTS), MPa | 330 | |
| 350 |
| Tensile Strength: Yield (Proof), MPa | 160 | |
| 170 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 130 |
| Specific Heat Capacity, J/kg-K | 270 | |
| 140 |
| Thermal Expansion, µm/m-K | 5.9 | |
| 5.9 |
Otherwise Unclassified Properties
| Density, g/cm3 | 6.5 | |
| 13 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 56 | |
| 73 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 130 | |
| 180 |
| Stiffness to Weight: Axial, points | 8.4 | |
| 3.3 |
| Stiffness to Weight: Bending, points | 24 | |
| 11 |
| Strength to Weight: Axial, points | 14 | |
| 7.4 |
| Strength to Weight: Bending, points | 16 | |
| 8.4 |
| Thermal Shock Resistance, points | 41 | |
| 55 |
Alloy Composition
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| Hafnium (Hf), % | 0 | |
| 99.8 to 100 |
| Zirconium (Zr), % | 99.7 to 100 | |
| 0 |
| Residuals, % | 0 to 0.27 | |
| 0 to 0.23 |