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Experimental Investigation of the Mg–Zn–Zr Isothermal Section at 400 °C

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Mg–Zn–Zr series Mg alloys (ZK) are one of the most important commercial Mg alloys due to their good comprehensive mechanical properties. The phase equilibria of the Mg–Zn–Zr system at 400 °C covering the overall composition range were investigated by X-ray diffraction and electron probe microanalyses on thirteen ternary alloys. Three ternary compounds, τ1, τ2 and τ3, were detected to be thermodynamically stable at 400 °C, and their homogeneity range was determined to be Mg(7–17)Zn(80–88)Zr(4–6), Mg(15–22)Zn(66–68)Zr(9–16) and Mg9Zn68Zr23 (in at.%), respectively. Eight three-phase regions and four two-phase regions were observed. The maximum solubility of Mg in Zn22Zr, Zn39Zr5 and Zn3Zr phases was measured to be 0.52, 0.37 and 0.99 at.%, respectively, while the solubility of Zr in MgZn2 and Mg2Zn3 phases is negligible. The isothermal section of the Mg–Zn–Zr system at 400 °C was then constructed based on the present experimental data.

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Acknowledgements

The financial supports from the National Key Research and Development Plan (No. 2016YFB0701202) and the National Natural Science Foundation of China (Grant No. 51771235) are greatly acknowledged.

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Authors and Affiliations

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

    Yong-Peng Liang, Shu-Hong Liu & Kai Xu

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

    Kai Xu & Yong Du

Authors
  1. Yong-Peng Liang
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  2. Shu-Hong Liu
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  3. Kai Xu
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  4. Yong Du
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Correspondence to Shu-Hong Liu.

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Available online at http://link.springer.com/journal/40195

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Liang, YP., Liu, SH., Xu, K. et al. Experimental Investigation of the Mg–Zn–Zr Isothermal Section at 400 °C. Acta Metall. Sin. (Engl. Lett.) 32, 426–432 (2019). https://doi.org/10.1007/s40195-018-0778-5

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  • DOI: https://doi.org/10.1007/s40195-018-0778-5

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