2091 aluminium alloy
# 2091 aluminium alloy

2091 Aluminium has Chromium, copper, iron, lithium, magnesium as minor alloying elements.

## Chemical Composition

| Element | 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% |

## 2091 Aluminium alloy properties

| Properties | 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 |
