Nickel 718 vs. Nickel 684
Both nickel 718 and nickel 684 are nickel alloys. They have 77% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is nickel 718 and the bottom bar is nickel 684.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 12 to 50 | |
| 11 |
| Fatigue Strength, MPa | 460 to 760 | |
| 390 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Reduction in Area, % | 34 to 64 | |
| 17 |
| Shear Modulus, GPa | 75 | |
| 76 |
| Shear Strength, MPa | 660 to 950 | |
| 710 |
| Tensile Strength: Ultimate (UTS), MPa | 930 to 1530 | |
| 1190 |
| Tensile Strength: Yield (Proof), MPa | 510 to 1330 | |
| 800 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 320 |
| Maximum Temperature: Mechanical, °C | 980 | |
| 1000 |
| Melting Completion (Liquidus), °C | 1340 | |
| 1370 |
| Melting Onset (Solidus), °C | 1260 | |
| 1320 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 75 | |
| 75 |
| Density, g/cm3 | 8.3 | |
| 8.3 |
| Embodied Carbon, kg CO2/kg material | 13 | |
| 10 |
| Embodied Energy, MJ/kg | 190 | |
| 140 |
| Embodied Water, L/kg | 250 | |
| 360 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 390 | |
| 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 660 to 4560 | |
| 1610 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 23 |
| Strength to Weight: Axial, points | 31 to 51 | |
| 40 |
| Strength to Weight: Bending, points | 25 to 35 | |
| 30 |
| Thermal Shock Resistance, points | 27 to 44 | |
| 34 |
Alloy Composition
| Aluminum (Al), % | 0.2 to 0.8 | |
| 2.5 to 3.3 |
| Boron (B), % | 0 to 0.0060 | |
| 0.0030 to 0.010 |
| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.15 |
| Chromium (Cr), % | 17 to 21 | |
| 15 to 20 |
| Cobalt (Co), % | 0 to 1.0 | |
| 13 to 20 |
| Copper (Cu), % | 0 to 0.3 | |
| 0 to 0.15 |
| Iron (Fe), % | 11.1 to 24.6 | |
| 0 to 4.0 |
| Manganese (Mn), % | 0 to 0.35 | |
| 0 to 0.75 |
| Molybdenum (Mo), % | 2.8 to 3.3 | |
| 3.0 to 5.0 |
| Nickel (Ni), % | 50 to 55 | |
| 42.7 to 64 |
| Niobium (Nb), % | 4.8 to 5.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 0.35 | |
| 0 to 0.75 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.015 |
| Titanium (Ti), % | 0.65 to 1.2 | |
| 2.5 to 3.3 |