Grade 705C Zirconium vs. R31538 Cobalt
Grade 705C zirconium belongs to the otherwise unclassified metals classification, while R31538 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is grade 705C zirconium and the bottom bar is R31538 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 98 | |
| 220 |
| Elongation at Break, % | 13 | |
| 13 to 23 |
| Poisson's Ratio | 0.34 | |
| 0.29 |
| Shear Modulus, GPa | 36 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 540 | |
| 1020 to 1360 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 580 to 930 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 320 |
| Specific Heat Capacity, J/kg-K | 270 | |
| 450 |
| Thermal Conductivity, W/m-K | 18 | |
| 13 |
| Thermal Expansion, µm/m-K | 5.7 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 6.7 | |
| 8.4 |
| Embodied Water, L/kg | 450 | |
| 530 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 66 | |
| 140 to 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 790 | |
| 750 to 1920 |
| Stiffness to Weight: Axial, points | 8.1 | |
| 15 |
| Stiffness to Weight: Bending, points | 23 | |
| 24 |
| Strength to Weight: Axial, points | 22 | |
| 34 to 45 |
| Strength to Weight: Bending, points | 22 | |
| 27 to 32 |
| Thermal Diffusivity, mm2/s | 9.9 | |
| 3.5 |
| Thermal Shock Resistance, points | 69 | |
| 25 to 33 |
Alloy Composition
| Carbon (C), % | 0 to 0.1 | |
| 0.15 to 0.35 |
| Chromium (Cr), % | 0 | |
| 26 to 30 |
| Cobalt (Co), % | 0 | |
| 58.7 to 68.9 |
| Hafnium (Hf), % | 0 to 4.5 | |
| 0 |
| Hydrogen (H), % | 0 to 0.0050 | |
| 0 |
| Iron (Fe), % | 0 to 0.3 | |
| 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 |
| Niobium (Nb), % | 2.0 to 3.0 | |
| 0 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 to 0.25 |
| Oxygen (O), % | 0 to 0.3 | |
| 0 |
| Phosphorus (P), % | 0 to 0.010 | |
| 0 |
| Silicon (Si), % | 0 | |
| 0 to 1.0 |
| Zirconium (Zr), % | 91.9 to 98 | |
| 0 |