Solder Alloy 721 vs. ASTM B817 Type II
Solder alloy 721 belongs to the otherwise unclassified metals classification, while ASTM B817 type II belongs to the titanium alloys. There are 18 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.
For each property being compared, the top bar is solder alloy 721 and the bottom bar is ASTM B817 type II.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 51 | |
| 100 |
| Elongation at Break, % | 17 | |
| 3.0 to 13 |
| Poisson's Ratio | 0.36 | |
| 0.32 |
| Shear Modulus, GPa | 19 | |
| 40 |
| Tensile Strength: Ultimate (UTS), MPa | 50 | |
| 900 to 960 |
Thermal Properties
| Latent Heat of Fusion, J/g | 61 | |
| 400 |
| Melting Completion (Liquidus), °C | 220 | |
| 1580 |
| Melting Onset (Solidus), °C | 210 | |
| 1530 |
| Specific Heat Capacity, J/kg-K | 220 | |
| 550 |
| Thermal Expansion, µm/m-K | 22 | |
| 9.9 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.4 | |
| 4.6 |
| Embodied Carbon, kg CO2/kg material | 17 | |
| 40 |
| Embodied Energy, MJ/kg | 280 | |
| 650 |
Common Calculations
| Stiffness to Weight: Axial, points | 3.8 | |
| 13 |
| Stiffness to Weight: Bending, points | 17 | |
| 34 |
| Strength to Weight: Axial, points | 1.9 | |
| 55 to 58 |
| Strength to Weight: Bending, points | 4.1 | |
| 45 to 47 |
| Thermal Shock Resistance, points | 3.2 | |
| 62 to 66 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.0010 | |
| 5.0 to 6.0 |
| Antimony (Sb), % | 0 to 0.1 | |
| 0 |
| Arsenic (As), % | 0 to 0.030 | |
| 0 |
| Bismuth (Bi), % | 0.8 to 1.2 | |
| 0 |
| Cadmium (Cd), % | 0 to 0.0020 | |
| 0 |
| Carbon (C), % | 0 | |
| 0 to 0.1 |
| Chlorine (Cl), % | 0 | |
| 0 to 0.2 |
| Copper (Cu), % | 0.3 to 0.7 | |
| 0.35 to 1.0 |
| Gold (Au), % | 0 to 0.050 | |
| 0 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Indium (In), % | 0 to 0.1 | |
| 0 |
| Iron (Fe), % | 0 to 0.020 | |
| 0.35 to 1.0 |
| Lead (Pb), % | 0 to 0.070 | |
| 0 |
| Nickel (Ni), % | 0 to 0.010 | |
| 0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.040 |
| Oxygen (O), % | 0 | |
| 0 to 0.3 |
| Silicon (Si), % | 0 | |
| 0 to 0.1 |
| Silver (Ag), % | 2.3 to 2.7 | |
| 0 |
| Sodium (Na), % | 0 | |
| 0 to 0.2 |
| Tin (Sn), % | 95 to 96.6 | |
| 1.5 to 2.5 |
| Titanium (Ti), % | 0 | |
| 82.1 to 87.8 |
| Vanadium (V), % | 0 | |
| 5.0 to 6.0 |
| Zinc (Zn), % | 0 to 0.0010 | |
| 0 |
| Residuals, % | 0 | |
| 0 to 0.4 |