Comparative Insight into the Interfacial Phase Evolutions during Solution Treatment of Dissimilar Friction Stir Welded AA2198-AA7475 and AA2198-AA6013 Aluminum Sheets

Jandaghi, Mohammad Reza; Pouraliakbar, Hesam; Saboori, Abdollah; Hong, Sun Ig; Pavese, Matteo

doi:10.3390/ma14051290

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Comparative Insight into the Interfacial Phase Evolutions during Solution Treatment of Dissimilar Friction Stir Welded AA2198-AA7475 and AA2198-AA6013 Aluminum Sheets

Mohammad Reza Jandaghi

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Department of Applied Science and Technology, Politecnico di Torino, Corso Duca Degli Abruzzi 24, 10129 Torino, Italy

Energy Functional Materials Laboratory (EFML), Department of Materials Science and Engineering, Chungnam National University, Daejeon 305764, Korea

Department of Management and Production Engineering (DIGEP), Politecnico di Torino, Corso Duca Degli Abruzzi 24, 10129 Torino, Italy

Author to whom correspondence should be addressed.

Academic Editors: Damjan Klobcar and Andrey Belyakov

Materials 2021, 14(5), 1290; https://doi.org/10.3390/ma14051290

Received: 23 January 2021 / Revised: 21 February 2021 / Accepted: 3 March 2021 / Published: 8 March 2021

(This article belongs to the Special Issue Welding and Joining of Materials for Advanced Aerospace Applications)

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Abstract

In the current research, dissimilar friction stir welded (FSW) sheets of AA2198-AA7475 and AA2198-AA6013 were solution treated at 460–580 °C for 1 h. Annealing at 580 °C led to complete degradation of both dissimilar weldments from the AA2198 side. According to the microstructure inspection, solution treatment triggered abnormal grain growth within the stir zone (SZ), and applying higher treatment temperatures enhanced the fraction of transformed grains. SEM analysis revealed that the pre-melting of grain boundaries (GBs) over 540 °C encouraged the diffusion of solute atoms to the GBs. The massive diffusion of Cu to the GBs led to the formation of Cu-rich eutectic phases in AA7475 and AA2198 and dense Cu-rich particles in AA6013. In the meantime, the diffusion of Mg and Zn to the GBs of AA7475 and Fe and Si to the GBs of AA6013 eventuated in the formation of coarse particles at the GBs which, in return, attenuated the bonding adhesion of the grains at SZ. The formation of remarkable Cu-rich phases in the pre-melted regions and significant contraction of the eutectic phase while cooling as well as the formation of particles at GBs resulted in intergranular failure of the joints from the AA2198 side of the SZ. View Full-Text

Keywords: friction stir welding (FSW); aluminum alloy; microstructure; grain boundary (GB); premelting; diffusion; failure

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MDPI and ACS Style

Jandaghi, M.R.; Pouraliakbar, H.; Saboori, A.; Hong, S.I.; Pavese, M. Comparative Insight into the Interfacial Phase Evolutions during Solution Treatment of Dissimilar Friction Stir Welded AA2198-AA7475 and AA2198-AA6013 Aluminum Sheets. Materials 2021, 14, 1290. https://doi.org/10.3390/ma14051290

AMA Style

Jandaghi MR, Pouraliakbar H, Saboori A, Hong SI, Pavese M. Comparative Insight into the Interfacial Phase Evolutions during Solution Treatment of Dissimilar Friction Stir Welded AA2198-AA7475 and AA2198-AA6013 Aluminum Sheets. Materials. 2021; 14(5):1290. https://doi.org/10.3390/ma14051290

Chicago/Turabian Style

Jandaghi, Mohammad Reza, Hesam Pouraliakbar, Abdollah Saboori, Sun Ig Hong, and Matteo Pavese. 2021. "Comparative Insight into the Interfacial Phase Evolutions during Solution Treatment of Dissimilar Friction Stir Welded AA2198-AA7475 and AA2198-AA6013 Aluminum Sheets" Materials 14, no. 5: 1290. https://doi.org/10.3390/ma14051290

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Comparative Insight into the Interfacial Phase Evolutions during Solution Treatment of Dissimilar Friction Stir Welded AA2198-AA7475 and AA2198-AA6013 Aluminum Sheets

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