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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 GuoEmail author
  • Yu Wang
  • Cai-hui Zheng
  • Ji-shan Zhang
  • Lin-zhong Zhuang
Article
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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.

Keywords

Al-Mg-Si-Cu-Zn alloy Ni addition Fe-rich phase phase transformation formability 

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Notes

Acknowledgements

This work was financially supported by the National Key Research and Development Program of China (No. 2016YFB0300801), the National Natural Science Foundation of China (Nos. 51871029, 51571023, and 51301016), Beijing Natural Science Foundation (No. 2172038), and Beijing Laboratory of Metallic Materials and Processing for Modern Transportation (No. FRF-SD-B-005B). The China Scholarship Council is also gratefully acknowledged for financial support to M.X. Guo.

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Copyright information

© University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Gao-jie Li
    • 1
  • Ming-xing Guo
    • 1
    Email author
  • Yu Wang
    • 1
  • Cai-hui Zheng
    • 1
  • Ji-shan Zhang
    • 1
  • Lin-zhong Zhuang
    • 1
  1. 1.State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijingChina

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