ASTM B596 Au-Cu vs. AZ31B Magnesium
ASTM B596 Au-Cu belongs to the otherwise unclassified metals classification, while AZ31B magnesium belongs to the magnesium alloys. There are 19 material properties with values for both materials. Properties with values for just one material (11, 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 B596 Au-Cu and the bottom bar is AZ31B magnesium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 100 | |
| 45 |
| Elongation at Break, % | 4.3 to 17 | |
| 5.6 to 12 |
| Poisson's Ratio | 0.41 | |
| 0.29 |
| Shear Modulus, GPa | 36 | |
| 17 |
| Shear Strength, MPa | 280 to 360 | |
| 130 to 160 |
| Tensile Strength: Ultimate (UTS), MPa | 450 to 620 | |
| 240 to 270 |
Thermal Properties
| Latent Heat of Fusion, J/g | 77 | |
| 350 |
| Melting Completion (Liquidus), °C | 1060 | |
| 600 |
| Melting Onset (Solidus), °C | 930 | |
| 600 |
| Specific Heat Capacity, J/kg-K | 150 | |
| 990 |
| Thermal Expansion, µm/m-K | 14 | |
| 26 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 14 | |
| 18 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 6.7 | |
| 95 |
Otherwise Unclassified Properties
| Density, g/cm3 | 18 | |
| 1.7 |
Common Calculations
| Stiffness to Weight: Axial, points | 3.1 | |
| 15 |
| Stiffness to Weight: Bending, points | 8.5 | |
| 70 |
| Strength to Weight: Axial, points | 6.8 to 9.4 | |
| 39 to 44 |
| Strength to Weight: Bending, points | 7.1 to 8.8 | |
| 50 to 55 |
| Thermal Shock Resistance, points | 22 to 30 | |
| 14 to 16 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 2.4 to 3.6 |
| Calcium (Ca), % | 0 | |
| 0 to 0.040 |
| Copper (Cu), % | 9.0 to 11 | |
| 0 to 0.050 |
| Gold (Au), % | 89 to 91 | |
| 0 |
| Iron (Fe), % | 0 | |
| 0 to 0.050 |
| Magnesium (Mg), % | 0 | |
| 93.6 to 97.1 |
| Manganese (Mn), % | 0 | |
| 0.050 to 1.0 |
| Nickel (Ni), % | 0 | |
| 0 to 0.0050 |
| Silicon (Si), % | 0 | |
| 0 to 0.1 |
| Zinc (Zn), % | 0 | |
| 0.5 to 1.5 |
| Residuals, % | 0 | |
| 0 to 0.3 |