Aluminium‐Lithium Alloy (Al‐Li) Weldalite 049 Description
Lithium is the lightest metallic element. The addition of lithium to aluminium reduces the alloy’s specific weight and increases its stiffness, while retaining a strength of up to 700 MPa, defined corrosion resistance, and an appropriate level of ductility.
Lithium reduces density and increases stiffness when alloyed with aluminium. With appropriate alloy design, aluminium–lithium alloys achieve measurable strength and toughness. Aluminium–Lithium Alloy (Al‐Li) Weldalite 049 is generally joined using friction stir welding.

Aluminium‐Lithium Alloy (Al‐Li) Weldalite 049 Specifications
Chemical Composition
Item#
|
Al
|
Li
|
Cu
|
Mg
|
Zr
|
Ag
|
Zn
|
Mn
|
Others
|
Weldalite-049
|
Bal.
|
0.7-1.8
|
2.3-5.2
|
0.25-0.8
|
0.14
|
0.25-0.8
|
-
|
-
|
-
|
Mechanical Properties
Designation
|
E (GPa)
|
Rm (MPa)
|
Rpo2 (MPa)
|
Elongation (%)
|
Density (g cm-3)
|
Weldalite-049
|
78.5
|
700
|
530
|
7.9
|
2.7
|
Delivery Specifications
Type
|
Cast Ingot
|
Rolled Sheet
|
Al-Li Alloy
|
φ80-φ200mm
|
Thickness: 1-20mm Width: 100-450mm
|
Al-Li Intermediate Alloy
|
Li:5%-30%
|
-
|
Application of Aluminium‐Lithium Alloy (Al‐Li) Weldalite 049
Aluminium–lithium alloys are employed in maritime, aerospace and electronic component applications due to their low weight, adequate formability and resistance to corrosion. In the aerospace industry, they are used in wing leading and trailing edges, fuselage stringers and internal framework components. Aluminium–Lithium Alloy (Al‐Li) is considered for various applications in modern aircraft, including wing structures.