AT4-6061 Type I vs. AT4-6061 Type II
Both AT4-6061 type I and AT4-6061 type II are variants of the same material. They share alloy composition and many physical properties, but develop different mechanical properties as a result of different processing.
For each property being compared, the top bar is AT4-6061 type I and the bottom bar is AT4-6061 type II.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 68 | |
| 68 |
| Elongation at Break, % | 3.5 | |
| 5.0 |
| Fatigue Strength, MPa | 32 | |
| 43 |
| Poisson's Ratio | 0.33 | |
| 0.33 |
| Shear Modulus, GPa | 25 | |
| 25 |
| Tensile Strength: Ultimate (UTS), MPa | 97 | |
| 160 |
| Tensile Strength: Yield (Proof), MPa | 79 | |
| 100 |
Thermal Properties
| Latent Heat of Fusion, J/g | 400 | |
| 400 |
| Maximum Temperature: Mechanical, °C | 170 | |
| 170 |
| Melting Completion (Liquidus), °C | 640 | |
| 640 |
| Melting Onset (Solidus), °C | 610 | |
| 610 |
| Specific Heat Capacity, J/kg-K | 900 | |
| 900 |
| Thermal Conductivity, W/m-K | 200 | |
| 200 |
| Thermal Expansion, µm/m-K | 23 | |
| 23 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 52 | |
| 52 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 170 | |
| 170 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.5 | |
| 9.5 |
| Density, g/cm3 | 2.7 | |
| 2.7 |
| Embodied Carbon, kg CO2/kg material | 8.3 | |
| 8.3 |
| Embodied Energy, MJ/kg | 150 | |
| 150 |
| Embodied Water, L/kg | 1180 | |
| 1180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 3.2 | |
| 7.0 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 46 | |
| 79 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 51 | |
| 51 |
| Strength to Weight: Axial, points | 10 | |
| 16 |
| Strength to Weight: Bending, points | 18 | |
| 24 |
| Thermal Diffusivity, mm2/s | 81 | |
| 81 |
| Thermal Shock Resistance, points | 4.4 | |
| 7.2 |
Alloy Composition
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| Aluminum (Al), % | 96 to 99.4 | |
| 96 to 99.4 |
| Copper (Cu), % | 0 to 0.5 | |
| 0 to 0.5 |
| Magnesium (Mg), % | 0.4 to 1.2 | |
| 0.4 to 1.2 |
| Silicon (Si), % | 0.2 to 0.8 | |
| 0.2 to 0.8 |
| Residuals, % | 0 to 1.5 | |
| 0 to 1.5 |