Aluminium alloy 6061 is a medium to high strength heat-treatable alloy and the most widely used of the 6000 series. It combines good mechanical strength with excellent corrosion resistance, very good weldability and good machinability, which is why it appears in everything from structural work to marine fittings. Magnesium and silicon are its principal alloying elements. 6061-T651 is solution heat treated, stress relieved by stretching and then artificially aged, giving a stable plate well suited to machining. Where higher strength is needed in the same series, alloy 6082 has largely superseded 6061 in structural applications.
| Element | Composition % |
|---|---|
| Silicon (Si) | 0.40 - 0.8 |
| Iron (Fe) | 0.7 Max |
| Copper (Cu) | 0.15 - 0.40 |
| Manganese (Mn) | 0.15 Max |
| Magnesium (Mg) | 0.8 - 1.2 |
| Chromium (Cr) | 0.04 - 0.35 |
| Zinc (Zn) | 0.25 Max |
| Titanium (Ti) | 0.15 Max |
| Others (Each) | 0.05 Max |
| Others (Total) | 0.15 Max |
| Aluminium (Al) | Balance |
| Property | Value |
|---|---|
| Proof Stress 0.2% (Rp) | 240 Min MPa |
| Tensile Strength (Rm) | 290 Min MPa |
| Elongation at 50 mm | 8 Min % |
| Hardness Brinell | 95 HB |
| Please note that Mechanical Properties shown are for T651 temper - Solution heat treated, stress relieved by stretching then artificially aged. Values vary with product form and thickness; refer to the mill certificate for the material supplied. | |
| Property | Value |
|---|---|
| Density | 2.70 g/cm3 |
| Melting Point | 582°C |
| Thermal Expansion | 23.6 ×10−6 /K |
| Modulus of Elasticity | 69 GPa |
| Thermal Conductivity | 167 W/m.K |
| Electrical Resistivity | 0.040 ×10−6Ω.m |
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