AZ81A Magnesium vs. 8090 Aluminum
AZ81A magnesium belongs to the magnesium alloys classification, while 8090 aluminum belongs to the aluminum alloys. There are 29 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is AZ81A magnesium and the bottom bar is 8090 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 46 | |
| 67 |
| Elongation at Break, % | 3.0 to 8.8 | |
| 3.5 to 13 |
| Fatigue Strength, MPa | 78 to 80 | |
| 91 to 140 |
| Poisson's Ratio | 0.29 | |
| 0.33 |
| Shear Modulus, GPa | 18 | |
| 25 |
| Tensile Strength: Ultimate (UTS), MPa | 160 to 240 | |
| 340 to 490 |
| Tensile Strength: Yield (Proof), MPa | 84 | |
| 210 to 420 |
Thermal Properties
| Latent Heat of Fusion, J/g | 350 | |
| 400 |
| Maximum Temperature: Mechanical, °C | 130 | |
| 190 |
| Melting Completion (Liquidus), °C | 600 | |
| 660 |
| Melting Onset (Solidus), °C | 500 | |
| 600 |
| Specific Heat Capacity, J/kg-K | 990 | |
| 960 |
| Thermal Conductivity, W/m-K | 84 | |
| 95 to 160 |
| Thermal Expansion, µm/m-K | 27 | |
| 24 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 12 | |
| 20 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 65 | |
| 66 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 12 | |
| 18 |
| Density, g/cm3 | 1.7 | |
| 2.7 |
| Embodied Carbon, kg CO2/kg material | 23 | |
| 8.6 |
| Embodied Energy, MJ/kg | 160 | |
| 170 |
| Embodied Water, L/kg | 990 | |
| 1160 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 4.0 to 17 | |
| 16 to 41 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 77 to 78 | |
| 340 to 1330 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 |
| Stiffness to Weight: Bending, points | 70 | |
| 50 |
| Strength to Weight: Axial, points | 26 to 39 | |
| 34 to 49 |
| Strength to Weight: Bending, points | 38 to 50 | |
| 39 to 50 |
| Thermal Diffusivity, mm2/s | 50 | |
| 36 to 60 |
| Thermal Shock Resistance, points | 9.1 to 14 | |
| 15 to 22 |
Alloy Composition
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| Aluminum (Al), % | 7.0 to 8.1 | |
| 93 to 98.4 |
| Chromium (Cr), % | 0 | |
| 0 to 0.1 |
| Copper (Cu), % | 0 to 0.1 | |
| 1.0 to 1.6 |
| Iron (Fe), % | 0 | |
| 0 to 0.3 |
| Lithium (Li), % | 0 | |
| 2.2 to 2.7 |
| Magnesium (Mg), % | 89.8 to 92.5 | |
| 0.6 to 1.3 |
| Manganese (Mn), % | 0.13 to 0.35 | |
| 0 to 0.1 |
| Nickel (Ni), % | 0 to 0.010 | |
| 0 |
| Silicon (Si), % | 0 to 0.3 | |
| 0 to 0.2 |
| Titanium (Ti), % | 0 | |
| 0 to 0.1 |
| Zinc (Zn), % | 0.4 to 1.0 | |
| 0 to 0.25 |
| Zirconium (Zr), % | 0 | |
| 0.040 to 0.16 |
| Residuals, % | 0 to 0.3 | |
| 0 to 0.15 |