Solder Alloy 721 vs. Nickel 689
Solder alloy 721 belongs to the otherwise unclassified metals classification, while nickel 689 belongs to the nickel alloys. There are 18 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.
For each property being compared, the top bar is solder alloy 721 and the bottom bar is nickel 689.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 51 | |
| 210 |
| Elongation at Break, % | 17 | |
| 23 |
| Poisson's Ratio | 0.36 | |
| 0.29 |
| Shear Modulus, GPa | 19 | |
| 80 |
| Tensile Strength: Ultimate (UTS), MPa | 50 | |
| 1250 |
Thermal Properties
| Latent Heat of Fusion, J/g | 61 | |
| 330 |
| Melting Completion (Liquidus), °C | 220 | |
| 1440 |
| Melting Onset (Solidus), °C | 210 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 220 | |
| 450 |
| Thermal Expansion, µm/m-K | 22 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.4 | |
| 8.5 |
| Embodied Carbon, kg CO2/kg material | 17 | |
| 11 |
| Embodied Energy, MJ/kg | 280 | |
| 150 |
Common Calculations
| Stiffness to Weight: Axial, points | 3.8 | |
| 14 |
| Stiffness to Weight: Bending, points | 17 | |
| 23 |
| Strength to Weight: Axial, points | 1.9 | |
| 41 |
| Strength to Weight: Bending, points | 4.1 | |
| 30 |
| Thermal Shock Resistance, points | 3.2 | |
| 35 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.0010 | |
| 0.75 to 1.3 |
| Antimony (Sb), % | 0 to 0.1 | |
| 0 |
| Arsenic (As), % | 0 to 0.030 | |
| 0 |
| Bismuth (Bi), % | 0.8 to 1.2 | |
| 0 |
| Boron (B), % | 0 | |
| 0.0030 to 0.010 |
| Cadmium (Cd), % | 0 to 0.0020 | |
| 0 |
| Carbon (C), % | 0 | |
| 0.1 to 0.2 |
| Chromium (Cr), % | 0 | |
| 18 to 20 |
| Cobalt (Co), % | 0 | |
| 9.0 to 11 |
| Copper (Cu), % | 0.3 to 0.7 | |
| 0 |
| Gold (Au), % | 0 to 0.050 | |
| 0 |
| Indium (In), % | 0 to 0.1 | |
| 0 |
| Iron (Fe), % | 0 to 0.020 | |
| 0 to 5.0 |
| Lead (Pb), % | 0 to 0.070 | |
| 0 |
| Manganese (Mn), % | 0 | |
| 0 to 0.5 |
| Molybdenum (Mo), % | 0 | |
| 9.0 to 10.5 |
| Nickel (Ni), % | 0 to 0.010 | |
| 48.3 to 60.9 |
| Phosphorus (P), % | 0 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 | |
| 0 to 0.5 |
| Silver (Ag), % | 2.3 to 2.7 | |
| 0 |
| Sulfur (S), % | 0 | |
| 0 to 0.015 |
| Tin (Sn), % | 95 to 96.6 | |
| 0 |
| Titanium (Ti), % | 0 | |
| 2.3 to 2.8 |
| Zinc (Zn), % | 0 to 0.0010 | |
| 0 |