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Volume 26 Issue 6
Jun.  2019
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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
Cite this article as:
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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研究论文

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

  • 通讯作者:

    Ming-xing Guo    E-mail: mingxingguo@skl.ustb.edu.cn

  • 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.
  • Research Article

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

    + Author Affiliations
    • 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.
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