Effect of Ni addition on microstructure and mechanical properties of Al-Mg-Si-Cu-Zn alloys with a high Mg/Si ratio

Gao-jie Li; Ming-xing Guo; Yu Wang; Cai-hui Zheng; Ji-shan Zhang; Lin-zhong Zhuang

doi:10.1007/s12613-019-1778-9

Volume 26 Issue 6

Jun. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(6): 740-751

Gao-jie Li, Ming-xing Guo, Yu Wang, Cai-hui Zheng, Ji-shan Zhang, and Lin-zhong Zhuang, Effect of Ni addition on microstructure and mechanical properties of Al-Mg-Si-Cu-Zn alloys with a high Mg/Si ratio, Int. J. Miner. Metall. Mater., 26(2019), No. 6, pp. 740-751. https://doi.org/10.1007/s12613-019-1778-9

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Gao-jie Li, Ming-xing Guo, Yu Wang, Cai-hui Zheng, Ji-shan Zhang, and Lin-zhong Zhuang, Effect of Ni addition on microstructure and mechanical properties of Al-Mg-Si-Cu-Zn alloys with a high Mg/Si ratio, Int. J. Miner. Metall. Mater., 26(2019), No. 6, pp. 740-751. https://doi.org/10.1007/s12613-019-1778-9

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Research Article

Effect of Ni addition on microstructure and mechanical properties of Al-Mg-Si-Cu-Zn alloys with a high Mg/Si ratio

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Corresponding author:
Ming-xing Guo E-mail: mingxingguo@skl.ustb.edu.cn
Received: 31 July 2018; Revised: 29 September 2018; Accepted: 8 October 2018

Abstract

Abstract

The effect of adding 0.03wt% Ni on the microstructure and mechanical properties of Al-Mg-Si-Cu-Zn alloys was systematically studied. The results reveal that the number density of spherical Fe-rich phases within grains increases with the addition of Ni, accompanied by the formation of Q (Al₃Mg₉Si₇Cu₂) precipitates around the spherical Fe-rich phases. Additionally, Ni addition is beneficial to reducing the grain size in the as-cast state. During the homogenization process, Q phases could be completely dissolved and the grain size could remain basically unchanged. However, compared with the Ni-free alloy, the Fe-rich phase in the Ni-containing alloy is more likely to undergo the phase transformation and further form more spherical particles during homogenization treatment. After thermomechanical processing, the distribution of Fe-rich phases in the Ni-containing alloy was further greatly improved and directly resulted in a greater formability than that of the Ni-free alloy. Accordingly, a reasonable Ni addition positively affected the microstructure and formability of the alloys.
- Al-Mg-Si-Cu-Zn alloy;
- Ni addition;
- Fe-rich phase;
- phase transformation;
- formability

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