Effect of the gap width in AZ31 magnesium alloy joints obtained by friction stir welding

Author(s)

Chiuzuli, Fernanda Rocha ^[1] ; Batistao, Bruna Fernanda ^[1] ; Bergmann, Luciano Andrei ^[2] ; de Alcantara, Nelson Guedes ^{[1, 3]} ; dos Santos, Jorge Fernandez ^[2] ; Klusemann, Benjamin ^{[2, 4]} ; Gargarella, Piter ^{[1, 3, 5]}

Affiliation

^[1] Univ Fed Sao Carlos, Grad Program Mat Sci & Engn PPGCEM UFSCar, Rodovia Washington Luiz, Km 235 SP-310, BR-13565905 Sao Carlos, SP - Brazil

^[2] Helmholtz Zent Hereon, Inst Mat Mech, Solid State Mat Proc, Max Planck Str. 1, D-21502 Geesthacht - Germany

^[3] Univ Fed Sao Carlos, Dept Mat Engn DEMa UFSCar, Rodovia Washington Luiz, Km 235 SP-310, BR-13565905 Sao Carlos, SP - Brazil

^[4] Leuphana Univ Luneburg, Inst Prod & Proc Innovat, Univ Allee 1, D-21335 Luneburg - Germany

^[5] Univ Fed Sao Carlos, Ctr Characterizat & Dev Mat CCDM, Rodovia Washington Luiz, Km 235 SP-310, BR-13565905 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T; v. 15, p. 5297-5306, NOV-DEC 2021.
• Web of Science Citations: 0

Abstract

Thin AZ31 magnesium alloy sheets, i.e., 2 mm thick, are welded by Friction Stir Welding (FSW) in butt joint configuration using gap width up to 1.15 mm. All welds present good surface finishing and no internal defects, except for the weld produced using the maximum gap width. A reduction of the weld thickness within the Stir Zone is seen with the increase in gap width, leading to a maximum thickness reduction of 8.5%. Microstructure and Vickers hardness investigations reveal no influence of the gap width on these properties. Up to a gap width of 0.51 mm, a slight decrease in the Ultimate Tensile Strength (UTS) is observed with increasing gap width. For larger gap widths, the UTS, as well as the fracture strain, are constant. To keep the metallurgical integrity, a maximum gap width of 1 mm seems acceptable for joints of thin AZ31 magnesium alloy sheets produced by FSW. (c) 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). (AU)

• FAPESP's process: 19/04613-3 - Evaluation of the microestruture and mechanical properties of dissimilar welding joints of aluminum AA5083-O/H111 and naval steel GL D36 welded by friction stir welding (FSW)
• Grantee: Bruna Fernanda Batistão
• Support Opportunities: Scholarships in Brazil - Master