About 2xxx Series Alloys
In the 2xxx series, copper is used as the principle alloying element and can be strengthened significantly through solution heat-treating. These alloys possess a good combination of high strength and toughness, but do not have the levels of atmospheric corrosion resistance as many other aluminum alloys. Therefore, these alloys are usually painted or clad for such exposures. They’re generally clad with a high-purity alloy or a 6xxx series alloy to greatly resist corrosion. Alloy 2024 perhaps the most widely known aircraft alloy.
Characteristics
2011 T6 is a free machining alloy of medium strength giving fragmented chips. Not suitable for anodising or welding.
Applications
Automatic lathe products, suitable for high speed repetitive machining.
Technical Specifications
The guaranteed minimum properties of 2011 T6 alloy are tabulated below.
| Physical Properties |
Metric |
| Density |
2.83 g/cc |
| Mechanical Properties |
Metric |
| Hardness, Brinell |
97 |
| Hardness, Knoop |
122 |
| Hardness, Vickers |
109 |
| Tensile Strength, Ultimate |
395 MPa |
| Tensile Strength, Yield |
270 MPa |
| Elongation at Break |
17.0% |
| Modulus of Elasticity |
70.0 GPa |
| Poissons Ratio |
0.33 |
| Fatigue Strength |
125 MPa |
| Shear Modulus |
26.0 GPa |
| Shear Strength |
235 MPa |
| Electrical Properties |
Metric |
| Electrical Resistivity |
0.00000400 ohm-cm @ 20 °C |
| Thermal Properties |
Metric |
| CTE, linear |
22.9 µm/m-°C |
| Specific Heat Capacity |
0.880 J/g-°C |
| Thermal Conductivity |
170 W/m-K |
| Melting Point |
540.6 - 643 °C |
| Solidus |
540.6 °C |
| Liquidus |
643 °C |
| Processing Properties |
Metric |
| Annealing Temperature |
413 °C |
| Solution Temperature |
524 °C |
| Component Elements Properties |
Metric |
| Aluminum, Al |
91.2 - 94.6 % |
| Bismuth, Bi |
0.20 - 0.60 % |
| Copper, Cu |
5.0 - 6.0 % |
| Iron, Fe |
<= 0.70 % |
| Lead, Pb |
0.20 - 0.60 % |
| Other, each |
<= 0.05 % |
| Other, total |
<= 0.15 % |
| Silicon, Si |
<= 0.40 % |
| Zinc, Zn |
<= 0.30 % |