Thermodynamic properties and microstructural characteristics of binary Ag-Sn alloys  

作　　者：ZHAI Wei WEI BingBo 

机构地区：[1]Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, Northwestern Polytechnical University

出　　处：《Chinese Science Bulletin》2013年第8期938-944,共7页

基　　金：supported by the National Natural Science Foundation of China (50971105 and 51201136);Doctoral Fund of Ministry of Education of china (20126102120059);Aviation Foundation of China (2012ZF53069);Technology Foundation for Selected Overseas Chinese Scholar, ShaanXi Province, Northwestern Polytechnical University Excellent Personnel Supporting Project of Ao Xiang Star;Fundamental Research Fund of Northwestern Polytechnical University (JC20110280)

摘　　要：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 ε 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.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 e 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.

关 键 词：合金凝固 热力学性质 二进制 差示扫描量热法 特征 组织 金属间化合物 温度区间 

分 类 号：TG146.32[一般工业技术—材料科学与工程]