Grade 20 Titanium vs. R31538 Cobalt
Grade 20 titanium belongs to the titanium alloys classification, while R31538 cobalt belongs to the cobalt alloys. There are 24 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is grade 20 titanium and the bottom bar is R31538 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 120 | |
| 220 |
| Elongation at Break, % | 5.7 to 17 | |
| 13 to 23 |
| Fatigue Strength, MPa | 550 to 630 | |
| 310 to 480 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Reduction in Area, % | 23 | |
| 13 to 22 |
| Shear Modulus, GPa | 47 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 900 to 1270 | |
| 1020 to 1360 |
| Tensile Strength: Yield (Proof), MPa | 850 to 1190 | |
| 580 to 930 |
Thermal Properties
| Latent Heat of Fusion, J/g | 400 | |
| 320 |
| Melting Completion (Liquidus), °C | 1660 | |
| 1360 |
| Melting Onset (Solidus), °C | 1600 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 520 | |
| 450 |
| Thermal Expansion, µm/m-K | 9.6 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 5.0 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 52 | |
| 8.1 |
| Embodied Energy, MJ/kg | 860 | |
| 110 |
| Embodied Water, L/kg | 350 | |
| 530 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 71 to 150 | |
| 140 to 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2940 to 5760 | |
| 750 to 1920 |
| Stiffness to Weight: Axial, points | 14 | |
| 15 |
| Stiffness to Weight: Bending, points | 33 | |
| 24 |
| Strength to Weight: Axial, points | 50 to 70 | |
| 34 to 45 |
| Strength to Weight: Bending, points | 41 to 52 | |
| 27 to 32 |
| Thermal Shock Resistance, points | 55 to 77 | |
| 25 to 33 |
Alloy Composition
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| Aluminum (Al), % | 3.0 to 4.0 | |
| 0 |
| Carbon (C), % | 0 to 0.050 | |
| 0.15 to 0.35 |
| Chromium (Cr), % | 5.5 to 6.5 | |
| 26 to 30 |
| Cobalt (Co), % | 0 | |
| 58.7 to 68.9 |
| Hydrogen (H), % | 0 to 0.020 | |
| 0 |
| Iron (Fe), % | 0 to 0.3 | |
| 0 to 0.75 |
| Manganese (Mn), % | 0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 0 | |
| 0 to 1.0 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 to 0.25 |
| Oxygen (O), % | 0 to 0.12 | |
| 0 |
| Palladium (Pd), % | 0.040 to 0.080 | |
| 0 |
| Silicon (Si), % | 0 | |
| 0 to 1.0 |
| Titanium (Ti), % | 71 to 77 | |
| 0 |
| Vanadium (V), % | 7.5 to 8.5 | |
| 0 |
| Zirconium (Zr), % | 3.5 to 4.5 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |