Achieving superior superplasticity from lamellar microstructure of a nugget in a friction-stir-welded Ti–6Al–4V joint. (15th March 2015)

• Record Type: Journal Article
• Authors: Wu, L.H.; Xiao, B.L.; Ni, D.R.; Ma, Z.Y.; Li, X.H.; Fu, M.J.; Zeng, Y.S.
• Is Part Of: Scripta materialia. Volume 98(2015)
• Page Start: 44
• Page End: 47
• Publication Date: 2015-03-15
• Subjects: Friction stir welding -- Titanium alloys -- Superplasticity -- Microstructure; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2014.11.011
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract : A largest elongation of 728% was achieved in a nugget of a friction-stir-welded (FSW) Ti–6Al–4V alloy joint with a fully lamellar microstructure; this is much larger than the maximum elongation ever reported in fusion-welded nuggets (<400%). This superior superplasticity in FSW nugget vs. fusion-welded nugget was mainly attributed to easier globularization of the lamellae with smaller thickness (172 nm) and aspect ratio (8.1) in the FSW nugget during preheating and superplastic deformation.