7178 Aluminum vs. AZ80A Magnesium
7178 aluminum belongs to the aluminum alloys classification, while AZ80A magnesium belongs to the magnesium alloys.
For each property being compared, the top bar is 7178 aluminum and the bottom bar is AZ80A magnesium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 71 | |
| 46 |
| Elongation at Break, % | 4.5 to 12 | |
| 3.9 to 8.5 |
| Fatigue Strength, MPa | 120 to 210 | |
| 140 to 170 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Shear Modulus, GPa | 27 | |
| 18 |
| Shear Strength, MPa | 140 to 380 | |
| 160 to 190 |
| Tensile Strength: Ultimate (UTS), MPa | 240 to 640 | |
| 320 to 340 |
| Tensile Strength: Yield (Proof), MPa | 120 to 560 | |
| 210 to 230 |
Thermal Properties
| Latent Heat of Fusion, J/g | 370 | |
| 350 |
| Maximum Temperature: Mechanical, °C | 180 | |
| 130 |
| Melting Completion (Liquidus), °C | 630 | |
| 600 |
| Melting Onset (Solidus), °C | 480 | |
| 490 |
| Specific Heat Capacity, J/kg-K | 860 | |
| 990 |
| Thermal Conductivity, W/m-K | 130 | |
| 77 |
| Thermal Expansion, µm/m-K | 23 | |
| 26 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 31 | |
| 11 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 91 | |
| 59 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 10 | |
| 12 |
| Density, g/cm3 | 3.1 | |
| 1.7 |
| Embodied Carbon, kg CO2/kg material | 8.2 | |
| 23 |
| Embodied Energy, MJ/kg | 150 | |
| 160 |
| Embodied Water, L/kg | 1110 | |
| 990 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 24 to 52 | |
| 12 to 24 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 110 to 2220 | |
| 500 to 600 |
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 45 | |
| 69 |
| Strength to Weight: Axial, points | 21 to 58 | |
| 51 to 55 |
| Strength to Weight: Bending, points | 28 to 54 | |
| 60 to 63 |
| Thermal Diffusivity, mm2/s | 47 | |
| 45 |
| Thermal Shock Resistance, points | 10 to 28 | |
| 19 to 20 |
Alloy Composition
| Aluminum (Al), % | 85.4 to 89.5 | |
| 7.8 to 9.2 |
| Chromium (Cr), % | 0.18 to 0.28 | |
| 0 |
| Copper (Cu), % | 1.6 to 2.4 | |
| 0 to 0.050 |
| Iron (Fe), % | 0 to 0.5 | |
| 0 to 0.0050 |
| Magnesium (Mg), % | 2.4 to 3.1 | |
| 89 to 91.9 |
| Manganese (Mn), % | 0 to 0.3 | |
| 0.12 to 0.5 |
| Nickel (Ni), % | 0 | |
| 0 to 0.0050 |
| Silicon (Si), % | 0 to 0.4 | |
| 0 to 0.1 |
| Titanium (Ti), % | 0 to 0.2 | |
| 0 |
| Zinc (Zn), % | 6.3 to 7.3 | |
| 0.2 to 0.8 |
| Residuals, % | 0 | |
| 0 to 0.3 |