AZ31C Magnesium vs. 5021 Aluminum
AZ31C magnesium belongs to the magnesium alloys classification, while 5021 aluminum belongs to the aluminum alloys.
For each property being compared, the top bar is AZ31C magnesium and the bottom bar is 5021 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 45 | |
| 68 |
| Elongation at Break, % | 12 | |
| 1.1 to 3.4 |
| Fatigue Strength, MPa | 150 | |
| 85 to 110 |
| Poisson's Ratio | 0.29 | |
| 0.33 |
| Shear Modulus, GPa | 17 | |
| 26 |
| Shear Strength, MPa | 130 | |
| 170 |
| Tensile Strength: Ultimate (UTS), MPa | 260 | |
| 300 to 310 |
| Tensile Strength: Yield (Proof), MPa | 200 | |
| 240 to 270 |
Thermal Properties
| Latent Heat of Fusion, J/g | 350 | |
| 400 |
| Maximum Temperature: Mechanical, °C | 110 | |
| 180 |
| Melting Completion (Liquidus), °C | 600 | |
| 640 |
| Melting Onset (Solidus), °C | 550 | |
| 590 |
| Specific Heat Capacity, J/kg-K | 990 | |
| 900 |
| Thermal Conductivity, W/m-K | 130 | |
| 140 |
| Thermal Expansion, µm/m-K | 26 | |
| 23 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 19 | |
| 35 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 98 | |
| 120 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 12 | |
| 9.5 |
| Density, g/cm3 | 1.7 | |
| 2.7 |
| Embodied Carbon, kg CO2/kg material | 23 | |
| 8.6 |
| Embodied Energy, MJ/kg | 160 | |
| 150 |
| Embodied Water, L/kg | 970 | |
| 1180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 28 | |
| 3.1 to 10 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 440 | |
| 440 to 550 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 |
| Stiffness to Weight: Bending, points | 70 | |
| 50 |
| Strength to Weight: Axial, points | 42 | |
| 30 to 32 |
| Strength to Weight: Bending, points | 53 | |
| 37 |
| Thermal Diffusivity, mm2/s | 74 | |
| 57 |
| Thermal Shock Resistance, points | 16 | |
| 13 to 14 |
Alloy Composition
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| Aluminum (Al), % | 2.4 to 3.6 | |
| 95.2 to 97.7 |
| Chromium (Cr), % | 0 | |
| 0 to 0.15 |
| Copper (Cu), % | 0 to 0.1 | |
| 0 to 0.15 |
| Iron (Fe), % | 0 | |
| 0 to 0.5 |
| Magnesium (Mg), % | 93.4 to 97 | |
| 2.2 to 2.8 |
| Manganese (Mn), % | 0.15 to 1.0 | |
| 0.1 to 0.5 |
| Nickel (Ni), % | 0 to 0.030 | |
| 0 |
| Silicon (Si), % | 0 to 0.1 | |
| 0 to 0.4 |
| Zinc (Zn), % | 0.5 to 1.5 | |
| 0 to 0.15 |
| Residuals, % | 0 to 0.3 | |
| 0 to 0.15 |