Suppression of abnormal grain growth in friction-stir welded Al–Cu–Mg alloy by lowering of welding temperature. (15th April 2021)

• Record Type: Journal Article
• Authors: Zuiko, Ivan S.; Mironov, Sergey; Betsofen, Sergey; Kaibyshev, Rustam
• Is Part Of: Scripta materialia. Number 196(2021)
• Publication Date: 2021-04-15
• Subjects: Aluminium alloys -- Friction-stir welding -- Abnormal grain growth -- Electron backscatter diffraction (EBSD) -- Transmission electron microscopy; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.113765
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The effect of welding temperature on thermal stability of friction-stir welded (FSWed) 2519 aluminum alloy was investigated. A lowering of the welding temperature below the particle dissolution threshold was shown to be a very effective way for suppression of abnormal grain growth during post-weld solution treatment. This effect was attributed to a prevention of the welded material from precipitation of fine dispersoids during subsequent annealing which resulted in relatively low Zener pressure and thus provided an activation of the apparently-normal grain-growth mechanism. This phenomenon was demonstrated for the first time and could be used as a processing strategy to improve thermal stability of FSWed heat-treatable alloys.