Thermodynamic assessment of phase equilibria In the Sn-Au-BI system with key experimental verification

Feng Gao, Cuiping Wang, Xingjun Liuaj, Yoshikazu Takaku, Ikuo Ohnuma, Kiyohito Tshida

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)576-586
Number of pages11
JournalJournal of Materials Research
Issue number3
Publication statusPublished - 2010 Mar 1

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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