7178 Aluminum vs. Grade 9 Titanium
7178 aluminum belongs to the aluminum alloys classification, while grade 9 titanium belongs to the titanium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.
For each property being compared, the top bar is 7178 aluminum and the bottom bar is grade 9 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 71 | |
| 110 |
| Elongation at Break, % | 4.5 to 12 | |
| 11 to 17 |
| Fatigue Strength, MPa | 120 to 210 | |
| 330 to 480 |
| Poisson's Ratio | 0.32 | |
| 0.32 |
| Shear Modulus, GPa | 27 | |
| 40 |
| Shear Strength, MPa | 140 to 380 | |
| 430 to 580 |
| Tensile Strength: Ultimate (UTS), MPa | 240 to 640 | |
| 700 to 960 |
| Tensile Strength: Yield (Proof), MPa | 120 to 560 | |
| 540 to 830 |
Thermal Properties
| Latent Heat of Fusion, J/g | 370 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 180 | |
| 330 |
| Melting Completion (Liquidus), °C | 630 | |
| 1640 |
| Melting Onset (Solidus), °C | 480 | |
| 1590 |
| Specific Heat Capacity, J/kg-K | 860 | |
| 550 |
| Thermal Conductivity, W/m-K | 130 | |
| 8.1 |
| Thermal Expansion, µm/m-K | 23 | |
| 9.1 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 31 | |
| 1.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 91 | |
| 2.7 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 10 | |
| 37 |
| Density, g/cm3 | 3.1 | |
| 4.5 |
| Embodied Carbon, kg CO2/kg material | 8.2 | |
| 36 |
| Embodied Energy, MJ/kg | 150 | |
| 580 |
| Embodied Water, L/kg | 1110 | |
| 150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 24 to 52 | |
| 89 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 110 to 2220 | |
| 1380 to 3220 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 45 | |
| 35 |
| Strength to Weight: Axial, points | 21 to 58 | |
| 43 to 60 |
| Strength to Weight: Bending, points | 28 to 54 | |
| 39 to 48 |
| Thermal Diffusivity, mm2/s | 47 | |
| 3.3 |
| Thermal Shock Resistance, points | 10 to 28 | |
| 52 to 71 |
Alloy Composition
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| Aluminum (Al), % | 85.4 to 89.5 | |
| 2.5 to 3.5 |
| Carbon (C), % | 0 | |
| 0 to 0.080 |
| Chromium (Cr), % | 0.18 to 0.28 | |
| 0 |
| Copper (Cu), % | 1.6 to 2.4 | |
| 0 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 0 to 0.5 | |
| 0 to 0.25 |
| Magnesium (Mg), % | 2.4 to 3.1 | |
| 0 |
| Manganese (Mn), % | 0 to 0.3 | |
| 0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.030 |
| Oxygen (O), % | 0 | |
| 0 to 0.15 |
| Silicon (Si), % | 0 to 0.4 | |
| 0 |
| Titanium (Ti), % | 0 to 0.2 | |
| 92.6 to 95.5 |
| Vanadium (V), % | 0 | |
| 2.0 to 3.0 |
| Zinc (Zn), % | 6.3 to 7.3 | |
| 0 |
| Residuals, % | 0 to 0.15 | |
| 0 to 0.4 |