Nickel 684 vs. Nickel 689
Both nickel 684 and nickel 689 are nickel alloys. Both are furnished in the aged (precipitation hardened) condition. They have a moderately high 91% of their average alloy composition in common.
For each property being compared, the top bar is nickel 684 and the bottom bar is nickel 689.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 310 | |
| 350 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 210 |
| Elongation at Break, % | 11 | |
| 23 |
| Fatigue Strength, MPa | 390 | |
| 420 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Reduction in Area, % | 17 | |
| 21 |
| Shear Modulus, GPa | 76 | |
| 80 |
| Shear Strength, MPa | 710 | |
| 790 |
| Tensile Strength: Ultimate (UTS), MPa | 1190 | |
| 1250 |
| Tensile Strength: Yield (Proof), MPa | 800 | |
| 690 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 330 |
| Maximum Temperature: Mechanical, °C | 1000 | |
| 990 |
| Melting Completion (Liquidus), °C | 1370 | |
| 1440 |
| Melting Onset (Solidus), °C | 1320 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 450 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 75 | |
| 70 |
| Density, g/cm3 | 8.3 | |
| 8.5 |
| Embodied Carbon, kg CO2/kg material | 10 | |
| 11 |
| Embodied Energy, MJ/kg | 140 | |
| 150 |
| Embodied Water, L/kg | 360 | |
| 330 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
| 240 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1610 | |
| 1170 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 23 |
| Strength to Weight: Axial, points | 40 | |
| 41 |
| Strength to Weight: Bending, points | 30 | |
| 30 |
| Thermal Shock Resistance, points | 34 | |
| 35 |
Alloy Composition
| Aluminum (Al), % | 2.5 to 3.3 | |
| 0.75 to 1.3 |
| Boron (B), % | 0.0030 to 0.010 | |
| 0.0030 to 0.010 |
| Carbon (C), % | 0 to 0.15 | |
| 0.1 to 0.2 |
| Chromium (Cr), % | 15 to 20 | |
| 18 to 20 |
| Cobalt (Co), % | 13 to 20 | |
| 9.0 to 11 |
| Copper (Cu), % | 0 to 0.15 | |
| 0 |
| Iron (Fe), % | 0 to 4.0 | |
| 0 to 5.0 |
| Manganese (Mn), % | 0 to 0.75 | |
| 0 to 0.5 |
| Molybdenum (Mo), % | 3.0 to 5.0 | |
| 9.0 to 10.5 |
| Nickel (Ni), % | 42.7 to 64 | |
| 48.3 to 60.9 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 0.75 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.015 |
| Titanium (Ti), % | 2.5 to 3.3 | |
| 2.3 to 2.8 |