AWS BAu-4 vs. AWS BAu-2
Both AWS BAu-4 and AWS BAu-2 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have 80% of their average alloy composition in common.
For each property being compared, the top bar is AWS BAu-4 and the bottom bar is AWS BAu-2.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 110 | |
| 100 |
| Poisson's Ratio | 0.4 | |
| 0.4 |
| Shear Modulus, GPa | 41 | |
| 36 |
| Tensile Strength: Ultimate (UTS), MPa | 200 | |
| 150 |
Thermal Properties
| Brazing Temperature, °C | 950 to 1000 | |
| 890 to 1010 |
| Latent Heat of Fusion, J/g | 100 | |
| 92 |
| Melting Completion (Liquidus), °C | 950 | |
| 890 |
| Melting Onset (Solidus), °C | 950 | |
| 890 |
| Specific Heat Capacity, J/kg-K | 190 | |
| 180 |
| Thermal Expansion, µm/m-K | 14 | |
| 15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 17 | |
| 17 |
Common Calculations
| Stiffness to Weight: Axial, points | 3.6 | |
| 3.3 |
| Stiffness to Weight: Bending, points | 9.3 | |
| 9.1 |
| Strength to Weight: Axial, points | 3.2 | |
| 2.4 |
| Strength to Weight: Bending, points | 4.4 | |
| 3.6 |
| Thermal Shock Resistance, points | 9.2 | |
| 7.1 |
Alloy Composition
| Copper (Cu), % | 0 | |
| 19.4 to 20.5 |
| Gold (Au), % | 81.5 to 82.5 | |
| 79.5 to 80.5 |
| Nickel (Ni), % | 17.4 to 18.5 | |
| 0 |
| Residuals, % | 0 | |
| 0 to 0.15 |