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Dissimilar modified friction stir clinching of AA2024-AA6061 aluminum alloys: Effects of materials positioning
Islamic Azad University, Department of Material Engineering, South Tehran Branch, Tehran, Iran (IRN).
Department of Mechanical Engineering, Amrita School of Engineering, Coimbatore, Amrita Vishwa Vidyapeetham, India (IND).
K.N. Toosi University of Technology, Department of Mechanical Engineering, Tehran, Iran (IRN).
Federal University of Technology Akure, Department of Industrial and Production Engineering, Akure, PMB 704, Nigeria (NGA).
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2020 (English)In: Journal of Materials Research and Technology, ISSN 2238-7854, Vol. 9, no 3, p. 6037-6047Article in journal (Refereed) Published
Abstract [en]

Modified friction stir clinching (MFSC) process was employed to joint dissimilar AA2024-T3 and AA6061-T6 Al sheets by interchanging the upper and the lower sheets during the joining process. The material flow, microstructure, tensile strength and fracture behaviors of the MFSC joints were studied. The results reveal that material positioning significantly affects the material flow behavior of the MFSC joint due to the disparity in the properties (flow stress) of the AA2024-T3 and AA6061-T6 Al alloys. The flow-induced hook path and proximity of hook tip to the geometric differential flow-induced defect (at the refilled end of the keyhole) are undesirable in the welded AA6061-T6/AA2024-T3 joint as compared to the AA2024-T3/AA6061-T6 joint. The microstructure (precipitate dispersion, dislocation density, and tangles), hardness distribution, and fracture morphology of the joints are altered by the material positioning-induced flow behavior. Improved tensile strength (97.88 MPa) is obtained in the AA2024-T3/AA6061-T6 joint as compared to the AA6061-T6/AA2024-T3 joint (86.65 MPa). (C) 2020 The Authors. Published by Elsevier B.V.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 9, no 3, p. 6037-6047
Keywords [en]
Modified friction stir clinching; Material positioning; AA2024-T3 aluminum alloy; Material flow; Fracture; Microstructure
National Category
Manufacturing, Surface and Joining Technology Other Materials Engineering
Identifiers
URN: urn:nbn:se:hv:diva-16044DOI: 10.1016/j.jmrt.2020.04.007ISI: 000573931400010Scopus ID: 2-s2.0-85084527691OAI: oai:DiVA.org:hv-16044DiVA, id: diva2:1502006
Available from: 2020-11-18 Created: 2020-11-18 Last updated: 2021-04-29Bibliographically approved

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