In-depth microscopic characterisation of the weld faying interface revealing stress-induced metallurgical transformations during friction stir spot welding

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dc.contributor.authorZlatanovic, Danka Labus
dc.contributor.authorBalos, Sebastian
dc.contributor.authorBergmann, Jean Pierre
dc.contributor.authorRasche, Stefan
dc.contributor.authorZavašnik, Janez
dc.contributor.authorPanchal, Vishal
dc.contributor.authorSidjanin, Leposava
dc.contributor.authorGoel, Saurav
dc.date.accessioned2021-04-13T14:23:09Z
dc.date.available2021-04-13T14:23:09Z
dc.date.issued2021-03-10
dc.description.abstractFriction stir spot welding (FSSW) is a solid-state welding process, wherein the properties of a weld joint are influenced by the state of friction and localised thermodynamic conditions at the tool-workpiece interface. An issue well-known about FSSW joints is their lack of reliability since they abruptly delaminate at the weld-faying interface (WFI). This study explores the origins of the delamination of multiple lap welded aluminium alloy (AA 5754-H111) sheets joined by FSSW at different rotational speeds typically used in industry. Experimental techniques such as the small punch test (SPT), Vickers hardness test, Scanning Electron Microscopy (SEM), Scanning Acoustic Microscope (SAM), Transmission Electron Microscopy (TEM), Energy-dispersive X-ray spectroscopy (EDX) and Frequency-Modulated Kelvin Probe Force Microscopy (FM-KPFM) were employed. The experimental results revealed that a complex interplay of stress-assisted metallurgical transformations at the intersection of WFI and the recrystallised stir zone (RSZ) can trigger dynamic precipitation leading to the formation of Al3Mg2 intermetallic phase, while metallic oxides and nanopits remain entrapped in the WFI. These metallurgical transformations surrounded by pits, precipitates and oxides induces process instability which in turn paves way for fast fracture to become responsible for delamination.en_UK
dc.identifier.citationZlatanovic DL, Balos S, Bergmann JP, et al., (2021) In-depth microscopic characterisation of the weld faying interface revealing stress-induced metallurgical transformations during friction stir spot welding. International Journal of Machine Tools and Manufacture, Volume 164, May 2021, Article number 103716en_UK
dc.identifier.issn0890-6955
dc.identifier.urihttps://doi.org/10.1016/j.ijmachtools.2021.103716
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/16561
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectdynamic precipitationen_UK
dc.subjectsmall punch testen_UK
dc.subjectweld faying interfaceen_UK
dc.subjectdelaminationen_UK
dc.subjectFriction stir spot weldingen_UK
dc.titleIn-depth microscopic characterisation of the weld faying interface revealing stress-induced metallurgical transformations during friction stir spot weldingen_UK
dc.typeArticleen_UK

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