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Chinese Science Bulletin

, Volume 58, Issue 8, pp 938–944 | Cite as

Thermodynamic properties and microstructural characteristics of binary Ag-Sn alloys

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Article Materials Science
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Abstract

The liquidus and solidus temperatures and enthalpy of fusion for Ag-Sn alloys are systematically measured within the whole composition range by differential scanning calorimetry (DSC). The measured enthalpy of fusion is related to Sn content by polynomial functions, which exhibit one maximum value at 52 wt%Sn and two minimum values around 21 wt%Sn and 96.5 wt%Sn, respectively. The liquidus slope, the solidification temperature interval, the solute partition coefficient and the entropy of fusion are calculated on the basis of the measured results. The undercoolability of those liquid Ag-Sn alloys solidifying with primary (Ag) solid solution phase is stronger than the other alloys with the preferential nucleation of ζ and ɛ intermetallic compounds. Morphological observations reveal that peritectic reactions can rarely be completed, and the peritectic microstructures are always composed of both primary and peritectic phases.

Keywords

Ag-Sn alloy enthalpy of fusion undercoolability peritectic solidification 
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Copyright information

© The Author(s) 2013

Authors and Affiliations

  1. 1.Key Laboratory of Space Applied Physics and Chemistry, Ministry of EducationNorthwestern Polytechnical UniversityXi’anChina

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