The Structure and Mechanical Properties of the Al-Li Base Alloys with Ti Additions 2002-01-2013
The aluminium-lithium alloys are modern materials capable to present higher mechanical properties reported to specific gravity being from this point of view very interesting for aerospace industry.
By means of optimal correlation's between the chemical composition, the mode of elaboration and casting, the conditions of plastic deformations and heat treatment, these alloys can present mechanical and plasticity properties comparable with those of the DURAL (2024) types, on the lower density conditions.
In the paper are presented the results of the studies and experimental researches made upon some lithium-lithium based alloys of the 2090 type, supplementary alloyed with Ti, for the use in aerospace constructions. There are made structure and property researches on the cast semi-manufactured product, plastic deformed and respective heat-treated to obtain the maximum mechanical characteristics.
There are made structure researches through qualitative optical microscopy, scanning electron microscopy and X-ray diffraction on the experimental samples of lithium-lithium base alloys of 2090 type supplementary alloyed with Ti. At the same time are determined the mechanical properties like tensile strain, flow stress, elongation, necking, hardness, and the corrosion resistance of the experimental alloys.