7178-O Aluminum vs. ISO-WD21150-O
7178-O aluminum belongs to the aluminum alloys classification, while ISO-WD21150-O belongs to the magnesium alloys.
For each property being compared, the top bar is 7178-O aluminum and the bottom bar is ISO-WD21150-O.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 71 | |
| 45 |
| Elongation at Break, % | 12 | |
| 11 |
| Fatigue Strength, MPa | 120 | |
| 120 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Shear Modulus, GPa | 27 | |
| 17 |
| Shear Strength, MPa | 140 | |
| 150 |
| Tensile Strength: Ultimate (UTS), MPa | 240 | |
| 240 |
| Tensile Strength: Yield (Proof), MPa | 120 | |
| 120 |
Thermal Properties
| Latent Heat of Fusion, J/g | 370 | |
| 350 |
| Maximum Temperature: Mechanical, °C | 180 | |
| 110 |
| Melting Completion (Liquidus), °C | 630 | |
| 600 |
| Melting Onset (Solidus), °C | 480 | |
| 550 |
| Specific Heat Capacity, J/kg-K | 860 | |
| 990 |
| Thermal Conductivity, W/m-K | 130 | |
| 100 |
| Thermal Expansion, µm/m-K | 23 | |
| 27 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 31 | |
| 19 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 91 | |
| 100 |
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 | |
| 980 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 24 | |
| 23 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 110 | |
| 160 |
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 45 | |
| 70 |
| Strength to Weight: Axial, points | 21 | |
| 40 |
| Strength to Weight: Bending, points | 28 | |
| 52 |
| Thermal Diffusivity, mm2/s | 47 | |
| 60 |
| Thermal Shock Resistance, points | 10 | |
| 15 |
Alloy Composition
| Aluminum (Al), % | 85.4 to 89.5 | |
| 2.4 to 3.6 |
| 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 | |
| 94 to 97 |
| Manganese (Mn), % | 0 to 0.3 | |
| 0.15 to 0.4 |
| 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 | |
| 0.5 to 1.5 |
| Residuals, % | 0 | |
| 0 to 0.3 |