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Thermodynamic assessment of phase equilibria in the Sn-Au-Bi system with key experimental verification

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Abstract

The phase equilibria at 200 °C, 250 °C, 300 °C, and 400 °C and the phase transformation of the Sn-Au-Bi system were investigated by using the electron probe micro-analyzer (EPMA) and differential scanning calorimeter (DSC), respectively. It is found that there is a new ternary intermetallic compound with a possible AuSn structure (called the φ phase in the present work), which has a limited solubility of Au in the Au-rich portion, and the φ phase decomposes peritectically at about 313 °C. Based on the experimental data reported in the previous papers and new experimental data determined by the present work, thermodynamic assessments of the Sn-Au-Bi system were carried out by the calculation of phase diagrams (CALPHAD) method. The thermodynamic parameters for describing the Gibbs free energy of each phase were optimized, and reasonable agreement between the calculated results and experimental data was obtained in the Sn-Au-Bi ternary system.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen, 361005, People’s Republic of China

    Feng Gao, Cuiping Wang & Xingjun Liu

  2. Research Center of Materials Design and Applications, Xiamen University, Xiamen, 361005, People’s Republic of China

    Feng Gao, Cuiping Wang & Xingjun Liu

  3. Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan

    Yoshikazu Takaku, Ikuo Ohnuma & Kiyohito Ishida

Authors
  1. Feng Gao
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  2. Cuiping Wang
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  3. Xingjun Liu
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  4. Yoshikazu Takaku
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  5. Ikuo Ohnuma
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  6. Kiyohito Ishida
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Correspondence to Xingjun Liu.

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Gao, F., Wang, C., Liu, X. et al. Thermodynamic assessment of phase equilibria in the Sn-Au-Bi system with key experimental verification. Journal of Materials Research 25, 576–586 (2010). https://doi.org/10.1557/JMR.2010.0056

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  • DOI: https://doi.org/10.1557/JMR.2010.0056

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