Abstract
This study deals with the in service durability of an alloy Al-Cu-Li 2050 friction stir welded. In an aeronautical context, this material could be submitted to mechanical stresses and a corrosive environment. Thus, the aim of this study is to characterize the intergranular stress corrosion cracking (IGSCC) behavior of the 2050 FSW weld nugget. First, a link has been established between several microstructural heterogeneities induced by the welding process and local strain variations, then between these heterogeneities and the initiation and propagation of IGSCC cracks.
Highlights
Friction stir welding (FSW) is a solid state metal joining technique for joining aluminum alloys, even those that are typically considered to be un-weldable, such as aluminum alloys 2XXX and 7XXX
The characteristic average band width formed by this texture was measured to be approximately 500 μm, which corresponds to the FSW tool advance per revolution
This microstructure corresponds to the typical “onion rings” structure of the FSW weld nugget [11]
Summary
Friction stir welding (FSW) is a solid state metal joining technique for joining aluminum alloys, even those that are typically considered to be un-weldable, such as aluminum alloys 2XXX and 7XXX. Using both lightweight aluminum lithium alloy and FSW technique could decrease significantly the weight of aircraft structures. Proton et al [2] highlighted that a post-welding heat treatment improves the resistance to environmental degradation of 2050 FSW joints. We will focus on the post-welding heat-treated weld nugget of AA2050, which is the preferential IGSCC initiation zone of the friction stir-welded joint. The effects of microstructure heterogeneities on local mechanical fields and their consequences on the IGSCC behavior have been investigated
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