R05255 Alloy vs. Reactor Grade Zirconium
Both R05255 alloy and reactor grade zirconium are otherwise unclassified metals. Both are furnished in the annealed condition. 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 R05255 alloy and the bottom bar is reactor grade zirconium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 98 |
| Elongation at Break, % | 20 | |
| 21 |
| Poisson's Ratio | 0.34 | |
| 0.34 |
| Shear Modulus, GPa | 70 | |
| 37 |
| Tensile Strength: Ultimate (UTS), MPa | 540 | |
| 330 |
| Tensile Strength: Yield (Proof), MPa | 450 | |
| 160 |
Thermal Properties
| Latent Heat of Fusion, J/g | 140 | |
| 250 |
| Specific Heat Capacity, J/kg-K | 140 | |
| 270 |
| Thermal Conductivity, W/m-K | 59 | |
| 22 |
| Thermal Expansion, µm/m-K | 6.6 | |
| 5.9 |
Otherwise Unclassified Properties
| Density, g/cm3 | 17 | |
| 6.5 |
| Embodied Water, L/kg | 630 | |
| 280 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 100 | |
| 56 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 530 | |
| 130 |
| Stiffness to Weight: Axial, points | 6.3 | |
| 8.4 |
| Stiffness to Weight: Bending, points | 11 | |
| 24 |
| Strength to Weight: Axial, points | 9.1 | |
| 14 |
| Strength to Weight: Bending, points | 8.9 | |
| 16 |
| Thermal Diffusivity, mm2/s | 25 | |
| 13 |
| Thermal Shock Resistance, points | 31 | |
| 41 |
Alloy Composition
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| Carbon (C), % | 0 to 0.010 | |
| 0 |
| Hydrogen (H), % | 0 to 0.0015 | |
| 0 |
| Iron (Fe), % | 0 to 0.010 | |
| 0 |
| Molybdenum (Mo), % | 0 to 0.020 | |
| 0 |
| Nickel (Ni), % | 0 to 0.010 | |
| 0 |
| Niobium (Nb), % | 0 to 0.5 | |
| 0 |
| Nitrogen (N), % | 0 to 0.010 | |
| 0 |
| Oxygen (O), % | 0 to 0.015 | |
| 0 |
| Silicon (Si), % | 0 to 0.0050 | |
| 0 |
| Tantalum (Ta), % | 95.9 to 98 | |
| 0 |
| Titanium (Ti), % | 0 to 0.010 | |
| 0 |
| Tungsten (W), % | 2.0 to 3.5 | |
| 0 |
| Zirconium (Zr), % | 0 | |
| 99.7 to 100 |
| Residuals, % | 0 | |
| 0 to 0.27 |