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2091 aluminium alloy 
Summary
2091 aluminium has chromium, copper, iron, lithium, magnesium as minor alloying elements.[1]
Chemical composition edit
| Element [1] | Value |
|---|---|
| Aluminum | 91.9 - 95.4% |
| Chromium | <= 0.10% |
| Copper | 1.8 - 2.5% |
| Iron | <= 0.30% |
| Lithium | 1.7 - 2.3% |
| Magnesium | 1.1 - 1.9% |
| Manganese | <= 0.10% |
| Other, each | <= 0.05% |
| Other, total | <= 0.15% |
| Silicon | <= 0.20% |
| Titanium | <= 0.10% |
| Zinc | <= 0.25% |
| Zirconium | 0.04 - 0.16% |
Properties edit
| Properties [1] | Value |
|---|---|
| Density | 2.58 g/cc |
| Tensile Strength, Ultimate | 430 MPa |
| Tensile Strength, Yield | 330 MPa |
| Elongation at Break | 18 % |
| Modulus of Elasticity | 75.0 GPa |
| CTE, linear | 23.9 μm/m-°C
@Temperature 20.0 - 100 °C |
| Specific Heat Capacity | 0.860 J/g-°C
at Temperature 100 °C |
| Thermal Conductivity | 84.0 W/m-K |
| Melting Point | 560 - 670 °C |
| Solidus | 560 °C |
| Liquidus | 670 °C |