4145 Aluminum vs. 4045 Aluminum
Both 4145 aluminum and 4045 aluminum are aluminum alloys. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a very high 96% of their average alloy composition in common.
For each property being compared, the top bar is 4145 aluminum and the bottom bar is 4045 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 73 | |
| 71 |
| Elongation at Break, % | 2.2 | |
| 2.3 |
| Fatigue Strength, MPa | 48 | |
| 45 |
| Poisson's Ratio | 0.33 | |
| 0.33 |
| Shear Modulus, GPa | 28 | |
| 27 |
| Shear Strength, MPa | 69 | |
| 69 |
| Tensile Strength: Ultimate (UTS), MPa | 120 | |
| 120 |
| Tensile Strength: Yield (Proof), MPa | 68 | |
| 64 |
Thermal Properties
| Brazing Temperature, °C | 570 to 600 | |
| 590 to 600 |
| Latent Heat of Fusion, J/g | 540 | |
| 540 |
| Maximum Temperature: Mechanical, °C | 160 | |
| 160 |
| Melting Completion (Liquidus), °C | 590 | |
| 600 |
| Melting Onset (Solidus), °C | 520 | |
| 580 |
| Specific Heat Capacity, J/kg-K | 880 | |
| 900 |
| Thermal Conductivity, W/m-K | 100 | |
| 170 |
| Thermal Expansion, µm/m-K | 21 | |
| 21 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 26 | |
| 45 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 84 | |
| 160 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 10 | |
| 9.5 |
| Density, g/cm3 | 2.8 | |
| 2.6 |
| Embodied Carbon, kg CO2/kg material | 7.6 | |
| 7.8 |
| Embodied Energy, MJ/kg | 140 | |
| 150 |
| Embodied Water, L/kg | 1040 | |
| 1070 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 2.3 | |
| 2.4 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 31 | |
| 29 |
| Stiffness to Weight: Axial, points | 14 | |
| 15 |
| Stiffness to Weight: Bending, points | 50 | |
| 54 |
| Strength to Weight: Axial, points | 12 | |
| 13 |
| Strength to Weight: Bending, points | 19 | |
| 21 |
| Thermal Diffusivity, mm2/s | 42 | |
| 74 |
| Thermal Shock Resistance, points | 5.5 | |
| 5.7 |
Alloy Composition
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| Aluminum (Al), % | 83 to 87.4 | |
| 87.4 to 91 |
| Chromium (Cr), % | 0 to 0.15 | |
| 0 |
| Copper (Cu), % | 3.3 to 4.7 | |
| 0 to 0.3 |
| Iron (Fe), % | 0 to 0.8 | |
| 0 to 0.8 |
| Magnesium (Mg), % | 0 to 0.15 | |
| 0 to 0.050 |
| Manganese (Mn), % | 0 to 0.15 | |
| 0 to 0.050 |
| Silicon (Si), % | 9.3 to 10.7 | |
| 9.0 to 11 |
| Titanium (Ti), % | 0 | |
| 0 to 0.2 |
| Zinc (Zn), % | 0 to 0.2 | |
| 0 to 0.1 |
| Residuals, % | 0 to 0.15 | |
| 0 to 0.15 |