R31539 Cobalt vs. Z21721 Zinc
R31539 cobalt belongs to the cobalt alloys classification, while Z21721 zinc belongs to the zinc alloys. There are 26 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is R31539 cobalt and the bottom bar is Z21721 zinc.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 87 |
| Elongation at Break, % | 13 to 22 | |
| 40 |
| Poisson's Ratio | 0.29 | |
| 0.25 |
| Shear Modulus, GPa | 86 | |
| 35 |
| Tensile Strength: Ultimate (UTS), MPa | 1000 to 1340 | |
| 150 |
| Tensile Strength: Yield (Proof), MPa | 590 to 940 | |
| 120 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 110 |
| Melting Completion (Liquidus), °C | 1360 | |
| 410 |
| Melting Onset (Solidus), °C | 1290 | |
| 390 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 390 |
| Thermal Conductivity, W/m-K | 13 | |
| 110 |
| Thermal Expansion, µm/m-K | 13 | |
| 26 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 27 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 37 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 6.6 |
| Embodied Carbon, kg CO2/kg material | 8.2 | |
| 2.8 |
| Embodied Energy, MJ/kg | 110 | |
| 53 |
| Embodied Water, L/kg | 530 | |
| 340 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 190 | |
| 57 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 780 to 2000 | |
| 88 |
| Stiffness to Weight: Axial, points | 15 | |
| 7.3 |
| Stiffness to Weight: Bending, points | 24 | |
| 22 |
| Strength to Weight: Axial, points | 33 to 44 | |
| 6.4 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 9.6 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 44 |
| Thermal Shock Resistance, points | 24 to 32 | |
| 4.8 |
Alloy Composition
| Aluminum (Al), % | 0.3 to 1.0 | |
| 0 to 0.0020 |
| Cadmium (Cd), % | 0 | |
| 0 to 0.070 |
| Carbon (C), % | 0 to 0.14 | |
| 0 |
| Chromium (Cr), % | 26 to 30 | |
| 0 |
| Cobalt (Co), % | 57.7 to 68.7 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0 to 0.0050 |
| Iron (Fe), % | 0 to 0.75 | |
| 0 to 0.010 |
| Lanthanum (La), % | 0.030 to 0.2 | |
| 0 |
| Lead (Pb), % | 0 | |
| 0 to 1.0 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 0 |
| Nickel (Ni), % | 0 to 1.0 | |
| 0 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 |
| Titanium (Ti), % | 0 | |
| 0 to 0.020 |
| Zinc (Zn), % | 0 | |
| 98.9 to 100 |