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Research on the Friction Stir Welding of Sc-Modified AA2519 Extrusion

Faculty of Mechanical Engineering, Military University of Technology, 2 gen. S. Kaliskiego str., 00-908 Warsaw, Poland
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Metals 2019, 9(10), 1024; https://doi.org/10.3390/met9101024
Received: 23 August 2019 / Revised: 17 September 2019 / Accepted: 19 September 2019 / Published: 21 September 2019
(This article belongs to the Special Issue Friction Stir Welding Prospective on Light-Alloys Joints)
The aim of this research was to investigate the effect of friction stir welding (FSW) parameters on microstructure and mechanical properties of Sc-modified AA2519 extrusion joints. The workpiece was welded by FSW in non-heat-treated condition with seven different sets of welding parameters. For each obtained joint macrostructure and microstructure observations were performed. Mechanical properties of joints were investigated using tensile test together with localization of fracture location. Joint efficiencies were established by comparing measured joints tensile strength to the value for base material. The obtained results show that investigated FSW joints of Sc-modified AA2519 in the non-heat-treated condition have joint efficiency within the range 87–95%. In the joints obtained with the lowest ratio of the tool rotation speed to the tool traverse speed, the occurrence of imperfections (voids) localized in the stir zone was reported. Three selected samples were subjected to further investigations consisting microhardness distribution and scanning electron microscopy fractography analysis. As the result of dynamic recrystallization, the microhardness of the base material value of 86 HV0.1 increased to about 110–125 HV0.1 in the stir zone depending on the used welding parameters. Due to lack of the strengthening phase and low strain hardening of used alloy the lack of a significantly softened zone was reported by both microhardness analysis and investigation of the fractured samples. View Full-Text
Keywords: friction stir welding; AA2519; extrusion; microstructure; mechanical properties; aluminum friction stir welding; AA2519; extrusion; microstructure; mechanical properties; aluminum
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MDPI and ACS Style

Kosturek, R.; Śnieżek, L.; Torzewski, J.; Wachowski, M. Research on the Friction Stir Welding of Sc-Modified AA2519 Extrusion. Metals 2019, 9, 1024.

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