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Effects of Cu and Al on the crystal structure and composition of η (MgZn2) phase in over-aged Al–Zn–Mg–Cu alloys

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Abstract

Heat treatable Al–Zn–Mg alloys can be strengthened by the precipitation of second phase particles. In this paper, Al–6.57%Zn–2.83%Mg and Al–6.57%Zn–2.83%Mg–3.92%Cu alloys (in wt%) in T7 state (140 °C for 96 h) have been prepared. The effects of Cu and Al on the concentration and structure of equilibrium η (MgZn2) phase have been investigated by high resolution transmission electron microscopy, aberration-corrected scanning transmission electron microscopy, selected election diffraction pattern simulations, and first-principles calculations. The effects of Cu and Al substitution on the diffraction characteristics of the η phase and the general rule of Cu and Al substitution in the η phase have been discussed.

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Acknowledgements

This work was financially supported by Natural Science Foundation of China (No. 50831007), Creative Research Group of National Natural Science Foundation of China (No. 51021063), Program for New Century Excellent Talents in University (NCET-10-0842), and Fundamental Research Funds for the Central Universities (2011JQ021).

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Authors and Affiliations

  1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China

    Xu Fang, Min Song, Kai Li, Yong Du, Dongdong Zhao & Chao Jiang

  2. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Hong Zhang

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  1. Xu Fang
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  2. Min Song
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  3. Kai Li
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  4. Yong Du
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  5. Dongdong Zhao
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  7. Hong Zhang
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Correspondence to Min Song.

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Fang, X., Song, M., Li, K. et al. Effects of Cu and Al on the crystal structure and composition of η (MgZn2) phase in over-aged Al–Zn–Mg–Cu alloys. J Mater Sci 47, 5419–5427 (2012). https://doi.org/10.1007/s10853-012-6428-9

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  • DOI: https://doi.org/10.1007/s10853-012-6428-9

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