M. Piellard, Aubert & Duval Issoire, Issoire, France
The so-called third generation of Al-Li alloys exhibits very good performances demonstrated on plates by Alcan and Airbus. To offer our customers the most advanced forging solutions, Aubert&Duval, Airbus and Alcan investigated the feasibility and characteristics of 2050 T852 forged products.
It was shown that, in addition to a low density, this alloy offers interesting static, fatigue and stress corrosion resistance properties compared to the 7xxx series alloys. The study demonstrated that the cold deformation, usually used for stress relieving, is a key parameter for ensuring the optimum properties of 2050 forged products.
Results on forged blocks and industrial parts will be shown. Those results also include fatigue tests on anodized components.
This oral will expose a common work between Aubert&Duval, Airbus and Alcan about the forging ability of 2050 alloy. We will present results on forged blocks and real size parts (more than 18 feet). The results are comparison between conventional 7xxx alloys and 2050 for tensile, toughness, fatigue (with our without anodization) and stress corrosion properties. The importance of cold deformation mastering will be also discussed.
