Aluminium lithium alloys pdf file

Aluminium lithium alli alloys are being used more frequently in the ac industry on all metallic parts such as actuator and hinge fittings, for which the fatigue and damage tolerance criteria are important. Corrosion resistance of 2060 aluminumlithium alloy lbw. Since the hot cracking tendency is known to be a function of weld metal composition, several crack resistant filler materials such as aa 2319, aa 4043 and aa 5356 are in common use. In this paper, 2060 alli alloys were welded by fiber laser with er2319 al5. Aluminiumlithium alloys hold promise of providing a breakthrough response to the crying need for lightweight alloys for use as structurals in aerospace. The first two generations of alli alloys tended to suffer from several problems, including poor ductility and fracture toughness. While primary approach to the problem is thus to modify weld metal chemistry, a secondary solution is to. Weldability of aluminumlithium alloys weldability is defined as the ability of a material to be welded free of defects. Aluminum alloys are second only to steels in use as structural metals. Alcoa has developed a number of alli alloys with these benefits, such as 2199 sheet and plate for fuselage and lower wing applications respectively, and 2099. The weldability characteristics of these lightweight alloys using gas metal arc, gas tungsten arc, electron beam. Welding of lightweight aluminumlithium alloys american. To maintain best quality, humidity levels of less than 2% are recommended.

The microstructure, micro segregation of alloying elements. This alloy has been specifically designed for structural components subject to high fatigue stress and risk of corrosion. This alloy allows the manufacturing of very thick parts up to 250 mm10 haracteristics this alloy used in the t852 condition achieves a balance between mechanical properties. Pdf the material and manufacturing property requirements for selection and application of 3rd generation aluminiumlithium alli alloys in. This is a list of named alloys grouped alphabetically by base metal. Aluminium and its alloys college of engineering and. Devardas alloy aluminium, zinc electrum gold, silver hepatizon gold, silver. Aluminium lithium alloys alli are a set of alloys of aluminium and lithium, often also including copper and zirconium. The principal disadvantages of peakstrength aluminumlithium alloys are reduced ductility and fracture toughness in the short transverse direction, anisotropy of in. Microstructural modification is especially attractive for alloys with pronounced hot cracking susceptibility. Aluminiumlithium based alloys offer low density, high elastic modulus, and high strength properties, and are therefore attractive for aerospace applications. Proceedings of the light metals technology conference 2007 new aluminum lithium alloys for aerospace applications cindie giummarra1, bruce thomas2 and roberto j.

Wrought aluminium alloys composition of aluminium alloys are regulated by internationally agreed classifications system. Aluminium lithium alloys overall the enhanced corrosion resistance of these alloys translates directly to longer aircraft inspection intervals and reduces the maintenance cost. Alli alloys are lighter and have high tensile and yield strength compared to the conventional highstrength aluminium alloys. Mechanical behaviour of aluminiumlithium alloys citeseerx. It is well known that lithium additions to aluminium provide a 3% density. Aluminum lithium alloys are one such class of materials. Aluminumlithium alloys are one such class of materials. Since lithium is the least dense elemental metal, these alloys are significantly less dense than aluminium. Aluminum and aluminum alloys 355 table 2 strength ranges of various wrought aluminum alloys aluminum type of tensile association alloy strengthening strength range series composition method mpa ksi 1xxx al cold work 70175 1025 2xxx alcumg heat treat 170310 2545 12.