2090 aluminium alloy
# 2090 aluminium alloy

2090 Aluminium alloy consists of copper, lithium, zirconium as minor elements and other impurity alloying elements.

## Chemical composition

| Element | Weight Percentage (%) |
| - | - |
| Aluminum | 93.2 - 95.6 |
| Copper | 2.4 - 3 |
| Lithium | 1.9 - 2.6 |
| Magnesium | ≤ 0.25 |
| Titanium | ≤ 0.15 |
| Iron | ≤ 0.12 |
| Zinc | ≤ 0.10 |
| Silicon | ≤ 0.10 |
| Zirconium | 0.080 - 0.15 |
| Manganese | ≤ 0.050 |
| Chromium | ≤ 0.050 |
| Other (each) | ≤ 0.050 |
| Other (total) | ≤ 0.15 |

## Physical properties

| Properties | Values |
| - | - |
| Density | 2.59 $g/cm^3$ |
| Melting point | 560 - 650 °C |

## Mechanical properties

| Properties | Values |
| - | - |
| Tensile strength | 550 MPa |
| Yield strength | 520 MPa |
| Elongation at break | 6% |
| Poisson's ratio | 0.34 |
| Elastic modulus | 76 GPa |

## Thermal properties

| Thermal Properties | Metric |
| - | - |
| CTE, linear | 23.6 μm/m-°C at Temperature 20.0 - 100 °C |
| Specific Heat Capacity | 1.203 J/g-°C at Temperature 100 °C |
| Thermal Conductivity | 88.0 W/m-K |
| Melting Point | 560 - 650 °C |
| Solidus | 560 °C |
| Liquidus | 650 °C |

## Applications

Aluminium 2090 alloy is used in aircraft components.

* Aircraft floor bulkhead stiffeners
* Wing leading and trailing edges
* Fuselage bulkhead webs
