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Open AccessArticle

Microstructural Evolutions and its Impact on the Corrosion Behaviour of Explosively Welded Al/Cu Bimetal

1
Department of Advanced Materials, WorldTech Scientific Research Center (WT-SRC), 1778864384 Tehran, Iran
2
Department of Applied Science and Technology, Politecnico Di Torino, Corso Duca Degli Abruzzi 24, 10129 Torino, Italy
3
Young Researchers and Elites Club, Saveh Branch, Islamic Azad University, 3919715179 Saveh, Iran
4
Center for Advanced Engineering Research, Majlesi Branch, Islamic Azad University, 8631656451 Isfahan, Iran
*
Author to whom correspondence should be addressed.
Metals 2020, 10(5), 634; https://doi.org/10.3390/met10050634 (registering DOI)
Received: 12 April 2020 / Revised: 9 May 2020 / Accepted: 11 May 2020 / Published: 13 May 2020
(This article belongs to the Special Issue Microstructure and Properties of Metallic Heat-Affected Zones)
In this study, the microstructural evolutions and corrosion resistance of aluminium/copper joint fabricated through explosive welding process have been thoroughly investigated, while stand-off distance was variable. Microstructural analyses demonstrate that, regardless of grain refinement in the welding boundary, increasing the stand-off space is followed by a higher thickness of the localized melting pool. X-Ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS) analyses recognized the binary intermetallic layers as a combination of Al2Cu and AlCu. Polarization and electrochemical impedance spectroscopy (EIS) corrosion tests revealed that a higher stand-off distance resulted in the increment of corrosion potential, current rate, and concentration gradient at the interface owing to the remarkable kinetic energy of the collision, which impaired corrosion resistance. View Full-Text
Keywords: explosive welding; stand-off distance; melt pool; corrosion rate; microstructure evolution explosive welding; stand-off distance; melt pool; corrosion rate; microstructure evolution
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Jandaghi, M.R.; Saboori, A.; Khalaj, G.; Khanzadeh Ghareh Shiran, M. Microstructural Evolutions and its Impact on the Corrosion Behaviour of Explosively Welded Al/Cu Bimetal. Metals 2020, 10, 634.

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