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Phase Equilibria of the Ternary Al-Cu-Zn Alloys on Al-Zn Rich Side

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Abstract

Phase equilibria of the Al-Cu-Zn system on Al-Zn rich side was experimentally determined with 16 alloys annealed at 360 °C. The annealed alloys were examined by means of x-ray diffraction, electron probe microanalysis and differential scanning calorimetry. Five single-phase regions and seven two-phase regions as well as three three-phase regions, i.e. α-(Al) + θ-Al2Cu + τ′-Al4Cu3Zn, α-(Al) + τ′-Al4Cu3Zn + ε-CuZn4 and α-(Al) + ε-CuZn4 + (Zn), were determined. The partial isothermal section of the Al-Cu-Zn system on Al-Zn rich side at 360 °C was constructed based on the obtained experimental data in this work. It was observed that the solid solution phase α-(Al) would easily decompose into ε-CuZn4, (Zn) and α′-(Al) at the ambient temperature in the early stages. The ternary phase τ′-Al4Cu3Zn would form and ε-CuZn4 would disappear gradually along with the extension of aging time.

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Acknowledgments

The financial supports from the National Natural Science Foundation of China (Grant Nos. 51531009, 51671219), and Sino-German Center for promotion of Science (Grant No. GZ 1208) are greatly acknowledged.

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Authors and Affiliations

  1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, Hunan, People’s Republic of China

    Yuhui Zhang, Fan Zhang, Shuhong Liu & Yong Du

  2. School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, Hunan, People’s Republic of China

    Fan Zhang

  3. Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi University, Nanning, 530004, Guangxi, People’s Republic of China

    Dandan Huang

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  1. Yuhui Zhang
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Correspondence to Shuhong Liu.

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Zhang, Y., Zhang, F., Liu, S. et al. Phase Equilibria of the Ternary Al-Cu-Zn Alloys on Al-Zn Rich Side. J. Phase Equilib. Diffus. 39, 356–365 (2018). https://doi.org/10.1007/s11669-018-0640-5

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  • DOI: https://doi.org/10.1007/s11669-018-0640-5

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