Effects of Ag addition on the microstructures and properties of Al-Mg-Si-Cu alloys

Li-zi He; Yi-heng Cao; Yi-zhou Zhou; Jian-zhong Cui

doi:10.1007/s12613-018-1547-1

Volume 25 Issue 1

Jan. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(1): 62-72

Li-zi He, Yi-heng Cao, Yi-zhou Zhou, and Jian-zhong Cui, Effects of Ag addition on the microstructures and properties of Al-Mg-Si-Cu alloys, Int. J. Miner. Metall. Mater., 25(2018), No. 1, pp. 62-72. https://doi.org/10.1007/s12613-018-1547-1

Cite this article as:

Li-zi He, Yi-heng Cao, Yi-zhou Zhou, and Jian-zhong Cui, Effects of Ag addition on the microstructures and properties of Al-Mg-Si-Cu alloys, Int. J. Miner. Metall. Mater., 25(2018), No. 1, pp. 62-72. https://doi.org/10.1007/s12613-018-1547-1

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Research Article

Effects of Ag addition on the microstructures and properties of Al-Mg-Si-Cu alloys

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Corresponding author:
Li-zi He E-mail: helizi@epm.neu.edu.cn
Received: 19 April 2017; Revised: 14 July 2017; Accepted: 9 August 2017

Abstract

Abstract

Effects of Ag addition on the microstructures, aging characteristics, tensile properties, electrochemical properties, and intergranular corrosion (IGC) properties of Al-1.1Mg-0.8Si-0.9Cu-0.35Mn-0.02Ti alloy were investigated using scanning electronic microscopy and transmission electronic microscopy. The aging process of Al-Mg-Si-Cu alloys was accelerated by the addition of Ag. The strength of peak-aged Al-Mg-Si-Cu alloys was enhanced by Ag addition because of the high density of β"- and L-phase age-hardening precipitates. The corrosion performance of the Al-Mg-Si-Cu alloy is closely related to the aging conditions and is independent of the Ag content. The IGC susceptibility is serious in the peak-aged alloy because of the continuous distribution of Cu-rich Q-phase precipitates along grain boundaries. Ag addition reduces the size of the grain-boundary-precipitate Q phase and the width of the precipitate-free zone and thus results in decreased IGC susceptibility of Al-Mg-Si-Cu alloys.
- Al-Mg-Si-Cu alloys;
- silver addition;
- aging;
- tensile properties;
- corrosion properties;
- microstructures

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