Phase equilibria and thermodynamic properties of Sn-Ag based Pb-free solder alloys

Ikuo Ohnuma, Masamitsu Miyashita, Xing Jun Liu, Hiroshi Ohtani, Kiyohito Ishida

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


We have recently developed a thermodynamic database for micro-soldering alloys, alloy database for micro-solders (ADAMIS). ADAMIS which consists of the elements Ag, Bi, Cu, In, Pb, Sb, Sn, and Zn has been constructed by the calculation of phase diagrams (CALPHAD) method. The thermodynamic parameters for describing the Gibbs energy of the liquid and solid phases have been evaluated by optimizing the experimental data on phase boundaries and thermo-chemical properties. In this paper, the phase equilibria and the related thermodynamic properties pertaining to the Sn-Ag-X (X = Bi, In, Cu, and Zn) alloys are examined using ADAMIS. Typical examples of the isothermal and vertical section phase diagrams, liquidus surface, etc. for these promising lead-free solders are presented. In addition. ADAMIS is also applied to calculate the nonequilibrium solidification process using the Scheil model.

Original languageEnglish
Pages (from-to)84-89
Number of pages6
JournalIEEE Transactions on Electronics Packaging Manufacturing
Issue number1
Publication statusPublished - 2003 Jan
Externally publishedYes


  • Micro-solder alloy
  • Phase equilibria
  • Thermodynamic database

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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