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Journal of Materials Science

, Volume 46, Issue 21, pp 6941–6951 | Cite as

Optimization of composition and heat treatment design of Mg–Sn–Zn alloys via the CALPHAD method

  • S. Avraham
  • A. Katsman
  • M. Bamberger
Article

Abstract

This work is focused on the application of the calculation of phase diagrams method for alloy and heat treatment design. We analyzed the influence of Zn content on the precipitation of Mg2Sn in Mg–Sn–Zn alloys. A comparison with previous studies in the Mg–Sn–Zn system was made according to the published results and computational thermochemistry simulations. The phase evolution in the Mg–Sn–Zn system was evaluated for the different compositions, and the simulations were used for precise alloy and heat treatment design. The composition of the ternary alloy was set as Mg–8wt%Sn–1.25wt%Zn. The Sn and Zn content was designed and confirmed to be within the α-Mg solubility limit at the solution treatment temperature. The addition of Zn and the heat treatment applied resulted in the enhancement and refinement of the Mg2Sn precipitation. Three Vickers micro-hardness maxima were detected: precipitation of metastable Mg–Zn phases, heterogeneous precipitation of Mg2Sn on the Mg–Zn precipitates, and Mg2Sn precipitation in the α-Mg matrix. The CT simulations were found to be a valuable alloy design tool.

Keywords

MgZn Solution Treatment Temperature Vickers Micro Hardness Inductively Couple Plasma Optical Emission Mg2Sn Phase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

Y. Shahaf, T. Leviatan, and Y. Maoz are acknowledged for their help in the sample preparation and measurements. J. Wang is acknowledged for sharing the Mg-Sn-Zn Thermo-Calc database. This study was partially supported by the Bernstein Research Fund, the authors acknowledge the fund for its support.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Department of Materials EngineeringTechnion-Israel Institute of TechnologyHaifaIsrael

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