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Materials 2018, 11(7), 1132; https://doi.org/10.3390/ma11071132

A Study on Dissimilar Friction Stir Welded between the Al–Li–Cu and the Al–Zn–Mg–Cu Alloys

1
School of Materials Science and Engineering, Central South University, Changsha 410083, China
2
Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Central, Central South University, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Received: 3 June 2018 / Revised: 23 June 2018 / Accepted: 28 June 2018 / Published: 4 July 2018
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

In this paper, the microstructure of friction stir welded between the Al–Li–Cu alloy and the Al–Zn–Mg–Cu alloy was studied using optical microscope(OM), electronic backscattered diffraction (EBSD), SEM, and TEM. The hardness profile revealed that the range of heat affect zone for the Al–Zn–Mg–Cu alloy was slightly wider than the Al–Li–Cu alloy when they suffered from the thermal transient. Additionally, the characterization of precipitates inside the different zones was obviously different, which corresponded to the microhardness distribution profile. At the periphery of the kissing line, the Al–Li–Cu and the Al–Zn–Mg–Cu alloys mutually diffused during the weld process. The magnesium element in the Al–Zn–Mg–Cu alloy diffused into the Al–Li–Cu alloy. But the copper and zinc had no change because of the low diffusion coefficient in aluminum. The heat affected zone of the Al–Zn–Mg–Cu alloy showed a higher corrosion susceptibility immersed into the corrosion environment, and the Al–Li–Cu alloy did not show severe corrosion. View Full-Text
Keywords: friction stir weld (FSW); the Al–Zn–Mg–Cu alloy; the Al–Li–Cu alloy; microstructure; diffusion; corrosion friction stir weld (FSW); the Al–Zn–Mg–Cu alloy; the Al–Li–Cu alloy; microstructure; diffusion; corrosion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wu, P.; Deng, Y.; Fan, S.; Ji, H.; Zhang, X. A Study on Dissimilar Friction Stir Welded between the Al–Li–Cu and the Al–Zn–Mg–Cu Alloys. Materials 2018, 11, 1132.

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