204.0 Aluminum vs. AZ81A Magnesium
204.0 aluminum belongs to the aluminum alloys classification, while AZ81A magnesium belongs to the magnesium alloys. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.
For each property being compared, the top bar is 204.0 aluminum and the bottom bar is AZ81A magnesium.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 90 to 120 | |
| 55 |
| Elastic (Young's, Tensile) Modulus, GPa | 71 | |
| 46 |
| Elongation at Break, % | 5.7 to 7.8 | |
| 3.0 to 8.8 |
| Fatigue Strength, MPa | 63 to 77 | |
| 78 to 80 |
| Poisson's Ratio | 0.33 | |
| 0.29 |
| Shear Modulus, GPa | 27 | |
| 18 |
| Tensile Strength: Ultimate (UTS), MPa | 230 to 340 | |
| 160 to 240 |
| Tensile Strength: Yield (Proof), MPa | 180 to 220 | |
| 84 |
Thermal Properties
| Latent Heat of Fusion, J/g | 390 | |
| 350 |
| Maximum Temperature: Mechanical, °C | 170 | |
| 130 |
| Melting Completion (Liquidus), °C | 650 | |
| 600 |
| Melting Onset (Solidus), °C | 580 | |
| 500 |
| Solidification (Pattern Maker's) Shrinkage, % | 1.3 | |
| 1.3 |
| Specific Heat Capacity, J/kg-K | 880 | |
| 990 |
| Thermal Conductivity, W/m-K | 120 | |
| 84 |
| Thermal Expansion, µm/m-K | 19 | |
| 27 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 29 to 34 | |
| 12 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 87 to 100 | |
| 65 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 11 | |
| 12 |
| Density, g/cm3 | 3.0 | |
| 1.7 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 23 |
| Embodied Energy, MJ/kg | 150 | |
| 160 |
| Embodied Water, L/kg | 1150 | |
| 990 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 12 to 23 | |
| 4.0 to 17 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 220 to 350 | |
| 77 to 78 |
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 46 | |
| 70 |
| Strength to Weight: Axial, points | 21 to 31 | |
| 26 to 39 |
| Strength to Weight: Bending, points | 28 to 36 | |
| 38 to 50 |
| Thermal Diffusivity, mm2/s | 46 | |
| 50 |
| Thermal Shock Resistance, points | 12 to 18 | |
| 9.1 to 14 |
Alloy Composition
| Aluminum (Al), % | 93.4 to 95.5 | |
| 7.0 to 8.1 |
| Copper (Cu), % | 4.2 to 5.0 | |
| 0 to 0.1 |
| Iron (Fe), % | 0 to 0.35 | |
| 0 |
| Magnesium (Mg), % | 0.15 to 0.35 | |
| 89.8 to 92.5 |
| Manganese (Mn), % | 0 to 0.1 | |
| 0.13 to 0.35 |
| Nickel (Ni), % | 0 to 0.050 | |
| 0 to 0.010 |
| Silicon (Si), % | 0 to 0.2 | |
| 0 to 0.3 |
| Tin (Sn), % | 0 to 0.050 | |
| 0 |
| Titanium (Ti), % | 0.15 to 0.3 | |
| 0 |
| Zinc (Zn), % | 0 to 0.1 | |
| 0.4 to 1.0 |
| Residuals, % | 0 | |
| 0 to 0.3 |