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Main Title: Improved mechanical properties of cast Mg alloy welds via texture weakening by differential rotation refill friction stir spot welding
Author(s): Fu, Banglong
Shen, Junjun
Suhuddin, Uceu F. H. R.
Chen, Ting
Santos, Jorge F. dos
Klusemann, Benjamin
Rethmeier, Michael
Type: Article
Abstract: Cast magnesium alloys welds produced by refill friction stir spot welding (refill FSSW) show low lap shear strength (LSS) and constantly fail in stirred zone (SZ) shear mode. The cause is most probably related to the heavily textured microstructure. Here, to re-engineer the resulting microstructure, we propose a novel process variant, the differential rotation refill FSSW (DR-refill FSSW). DR-refill FSSW stimulates discontinuous dynamic recrystallization and produces a bimodal microstructure with weakened texture. Therefore, the deformation incompatibility between SZ and thermal-mechanically affected zone is avoided. The welds have 50% higher LSS than that of standard refill FSSW welds, and fail in a different failure mode, i.e., SZ pull-out mode. DR-refill FSSW provides a new and effective strategy for improving the performance of spot welds based on microstructural engineering.
Subject(s): refill friction stir spot welding
magnesium alloy
plastic deformation
Issue Date: 7-Jul-2021
Date Available: 4-Nov-2021
Language Code: en
DDC Class: 670 Industrielle Fertigung
Journal Title: Scripta Materialia
Publisher: Elsevier
Volume: 203
Article Number: 114113
Publisher DOI: 10.1016/j.scriptamat.2021.114113
EISSN: 1872-8456
ISSN: 1359-6462
TU Affiliation(s): Fak. 5 Verkehrs- und Maschinensysteme » Inst. Werkzeugmaschinen und Fabrikbetrieb » FG Fügetechnik
Appears in Collections:Technische Universität Berlin » Publications

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