AZ81A Magnesium vs. Zamak 7
AZ81A magnesium belongs to the magnesium alloys classification, while Zamak 7 belongs to the zinc alloys. There are 33 material properties with values for both materials. Properties with values for just one material (1, 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 AZ81A magnesium and the bottom bar is Zamak 7.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 55 | |
| 80 |
| Compressive (Crushing) Strength, MPa | 310 to 370 | |
| 410 |
| Elastic (Young's, Tensile) Modulus, GPa | 46 | |
| 86 |
| Elongation at Break, % | 3.0 to 8.8 | |
| 13 |
| Fatigue Strength, MPa | 78 to 80 | |
| 47 |
| Poisson's Ratio | 0.29 | |
| 0.25 |
| Shear Modulus, GPa | 18 | |
| 33 |
| Shear Strength, MPa | 91 to 130 | |
| 210 |
| Tensile Strength: Ultimate (UTS), MPa | 160 to 240 | |
| 280 |
| Tensile Strength: Yield (Proof), MPa | 84 | |
| 250 |
Thermal Properties
| Latent Heat of Fusion, J/g | 350 | |
| 120 |
| Maximum Temperature: Mechanical, °C | 130 | |
| 95 |
| Melting Completion (Liquidus), °C | 600 | |
| 390 |
| Melting Onset (Solidus), °C | 500 | |
| 380 |
| Solidification (Pattern Maker's) Shrinkage, % | 1.3 | |
| 1.2 |
| Specific Heat Capacity, J/kg-K | 990 | |
| 410 |
| Thermal Conductivity, W/m-K | 84 | |
| 110 |
| Thermal Expansion, µm/m-K | 27 | |
| 27 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 12 | |
| 27 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 65 | |
| 38 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 12 | |
| 11 |
| Density, g/cm3 | 1.7 | |
| 6.4 |
| Embodied Carbon, kg CO2/kg material | 23 | |
| 3.0 |
| Embodied Energy, MJ/kg | 160 | |
| 57 |
| Embodied Water, L/kg | 990 | |
| 380 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 4.0 to 17 | |
| 36 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 77 to 78 | |
| 370 |
| Stiffness to Weight: Axial, points | 15 | |
| 7.5 |
| Stiffness to Weight: Bending, points | 70 | |
| 23 |
| Strength to Weight: Axial, points | 26 to 39 | |
| 12 |
| Strength to Weight: Bending, points | 38 to 50 | |
| 15 |
| Thermal Diffusivity, mm2/s | 50 | |
| 43 |
| Thermal Shock Resistance, points | 9.1 to 14 | |
| 8.6 |
Alloy Composition
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| Aluminum (Al), % | 7.0 to 8.1 | |
| 3.5 to 4.3 |
| Cadmium (Cd), % | 0 | |
| 0 to 0.0020 |
| Copper (Cu), % | 0 to 0.1 | |
| 0 to 0.25 |
| Iron (Fe), % | 0 | |
| 0 to 0.075 |
| Lead (Pb), % | 0 | |
| 0 to 0.0030 |
| Magnesium (Mg), % | 89.8 to 92.5 | |
| 0.0050 to 0.020 |
| Manganese (Mn), % | 0.13 to 0.35 | |
| 0 |
| Nickel (Ni), % | 0 to 0.010 | |
| 0.0050 to 0.020 |
| Silicon (Si), % | 0 to 0.3 | |
| 0 |
| Tin (Sn), % | 0 | |
| 0 to 0.0010 |
| Zinc (Zn), % | 0.4 to 1.0 | |
| 95.3 to 96.5 |
| Residuals, % | 0 to 0.3 | |
| 0 |