Microstructure and mechanical properties of friction stir welded joints made from ultrafine grained aluminium 1050

Lipińska, Marta and Olejnik, Lech and Pietras, Adam and Rosochowski, Andrzej and Bazarnik, Piotr and Goliński, Jacek and Brynk, Tomasz and Lewandowska, Małgorzata (2015) Microstructure and mechanical properties of friction stir welded joints made from ultrafine grained aluminium 1050. Materials and Design, 88. pp. 22-31. ISSN 0264-1275

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    Abstract

    In order to obtain ultrafine grained structure, commercially pure aluminium (Al 1050) plates were subjected up to 8 passes of Incremental Equal Channel Angular Pressing (IECAP) following route C. Plates in different stages of IECAP were joined using Friction Stir Welding (FSW). All welded samples were investigated to determine their mechanical properties and structure evolution in the joint zone. The joining process reduced mechanical strength of material in the nugget zone, which was explained by the grain growth resulting from temperature rise during FSW. Nevertheless, the obtained results are promising in comparison to other methods of joining aluminium.