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Thermodynamic Description of Al-Si-Mg-Ce Quaternary System in Al-Rich Corner and Its Experimental Validation

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Abstract

In order to establish a self-consistent thermodynamic database for Al-Si-Mg-Ce quaternary system, all the thermodynamic descriptions of 6 boundary binaries, i.e., Al-Mg, Al-Si, Al-Ce, Mg-Si, Mg-Ce, and Si-Ce were first unified. Then, the thermodynamic descriptions for ternary Al-Mg-Ce system were re-assessed using the CALculation of PHAse Diagrams (CALPHAD) method based on all the critically reviewed experimental phase equilibria. Moreover, the consistency between thermodynamic descriptions for Al-Si-Ce ternary system and those for the unified binaries was checked and confirmed. Subsequently, the thermodynamic database for the Al-Si-Mg-Ce quaternary system was established by combining the four ternary subsystems, and the phase equilibria/thermodynamic properties of the quaternary system were predicted via direct extrapolation from the ternary systems. The reliability of the established database was finally validated in one Al-7Si-0.6Mg-0.4Ce quaternary model alloy by comprehensively comparing its experimentally measured phase transition temperatures and solidified microstructure characteristics with the Gulliver-Scheil simulation ones. Good agreement between the thermodynamic predictions and experimental results indicates the present thermodynamic database is reliable.

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Acknowledgments

The financial support from the National Natural Science Foundation of China (Grant No. 51474239) and the National Key Research and Development Program of China (Grant No. 2016YFB0301101) is acknowledged. Xi Li thanks Prof. Bo Sundman from INSTN, CEA Saclay, France for his kind help and suggestion on thermodynamic modeling. Lijun Zhang acknowledges financial support from the project supported by State Key Laboratory of Powder Metallurgy Foundation, Central South University, Changsha, China.

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Authors and Affiliations

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

    Zhao Lu & Lijun Zhang

  2. School of Mechanical, Material, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW, 2522, Australia

    Xi Li

  3. Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, 2234, Australia

    Xi Li

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  1. Zhao Lu
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Correspondence to Lijun Zhang.

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Lu, Z., Li, X. & Zhang, L. Thermodynamic Description of Al-Si-Mg-Ce Quaternary System in Al-Rich Corner and Its Experimental Validation. J. Phase Equilib. Diffus. 39, 57–67 (2018). https://doi.org/10.1007/s11669-017-0607-y

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