ASTM B477 Au-Ni-Ag vs. R30021 Cobalt
ASTM B477 Au-Ni-Ag belongs to the otherwise unclassified metals classification, while R30021 cobalt belongs to the cobalt alloys. There are 18 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is ASTM B477 Au-Ni-Ag and the bottom bar is R30021 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 95 | |
| 220 |
| Elongation at Break, % | 5.5 to 11 | |
| 9.0 |
| Poisson's Ratio | 0.41 | |
| 0.29 |
| Shear Modulus, GPa | 34 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 310 to 550 | |
| 700 |
Thermal Properties
| Latent Heat of Fusion, J/g | 80 | |
| 330 |
| Melting Completion (Liquidus), °C | 1010 | |
| 1350 |
| Melting Onset (Solidus), °C | 930 | |
| 1190 |
| Specific Heat Capacity, J/kg-K | 160 | |
| 450 |
| Thermal Expansion, µm/m-K | 15 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 14 | |
| 1.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 7.5 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 17 | |
| 8.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 3.1 | |
| 15 |
| Stiffness to Weight: Bending, points | 8.9 | |
| 24 |
| Strength to Weight: Axial, points | 5.0 to 9.0 | |
| 23 |
| Strength to Weight: Bending, points | 6.0 to 8.8 | |
| 21 |
| Thermal Shock Resistance, points | 16 to 28 | |
| 21 |
Alloy Composition
| Carbon (C), % | 0 | |
| 0.2 to 0.35 |
| Chromium (Cr), % | 0 | |
| 26 to 29 |
| Cobalt (Co), % | 0 | |
| 61.7 to 67.3 |
| Gold (Au), % | 74.2 to 75.8 | |
| 0 |
| Iron (Fe), % | 0 | |
| 0 to 3.0 |
| Molybdenum (Mo), % | 0 | |
| 4.5 to 6.0 |
| Nickel (Ni), % | 2.6 to 3.4 | |
| 2.0 to 3.0 |
| Silicon (Si), % | 0 | |
| 0 to 1.5 |
| Silver (Ag), % | 21.4 to 22.6 | |
| 0 |
| Residuals, % | 0 to 0.3 | |
| 0 |