4045 Aluminum vs. 4004 Aluminum
Both 4045 aluminum and 4004 aluminum are aluminum alloys. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a very high 98% of their average alloy composition in common.
For each property being compared, the top bar is 4045 aluminum and the bottom bar is 4004 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 71 | |
| 71 |
| Elongation at Break, % | 2.3 | |
| 2.4 |
| Fatigue Strength, MPa | 45 | |
| 42 |
| Poisson's Ratio | 0.33 | |
| 0.33 |
| Shear Modulus, GPa | 27 | |
| 27 |
| Shear Strength, MPa | 69 | |
| 63 |
| Tensile Strength: Ultimate (UTS), MPa | 120 | |
| 110 |
| Tensile Strength: Yield (Proof), MPa | 64 | |
| 60 |
Thermal Properties
| Brazing Temperature, °C | 590 to 600 | |
| 590 to 600 |
| Latent Heat of Fusion, J/g | 540 | |
| 540 |
| Maximum Temperature: Mechanical, °C | 160 | |
| 160 |
| Melting Completion (Liquidus), °C | 600 | |
| 600 |
| Melting Onset (Solidus), °C | 580 | |
| 560 |
| Specific Heat Capacity, J/kg-K | 900 | |
| 910 |
| Thermal Conductivity, W/m-K | 170 | |
| 130 |
| Thermal Expansion, µm/m-K | 21 | |
| 22 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 45 | |
| 33 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 160 | |
| 120 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.5 | |
| 9.5 |
| Density, g/cm3 | 2.6 | |
| 2.6 |
| Embodied Carbon, kg CO2/kg material | 7.8 | |
| 8.0 |
| Embodied Energy, MJ/kg | 150 | |
| 150 |
| Embodied Water, L/kg | 1070 | |
| 1070 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 2.4 | |
| 2.3 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 29 | |
| 25 |
| Stiffness to Weight: Axial, points | 15 | |
| 15 |
| Stiffness to Weight: Bending, points | 54 | |
| 54 |
| Strength to Weight: Axial, points | 13 | |
| 12 |
| Strength to Weight: Bending, points | 21 | |
| 20 |
| Thermal Diffusivity, mm2/s | 74 | |
| 58 |
| Thermal Shock Resistance, points | 5.7 | |
| 5.1 |
Alloy Composition
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| Aluminum (Al), % | 87.4 to 91 | |
| 86 to 90 |
| Copper (Cu), % | 0 to 0.3 | |
| 0 to 0.25 |
| Iron (Fe), % | 0 to 0.8 | |
| 0 to 0.8 |
| Magnesium (Mg), % | 0 to 0.050 | |
| 1.0 to 2.0 |
| Manganese (Mn), % | 0 to 0.050 | |
| 0 to 0.1 |
| Silicon (Si), % | 9.0 to 11 | |
| 9.0 to 10.5 |
| Titanium (Ti), % | 0 to 0.2 | |
| 0 |
| Zinc (Zn), % | 0 to 0.1 | |
| 0 to 0.2 |
| Residuals, % | 0 to 0.15 | |
| 0 to 0.15 |