Ag-Ge合金相图的热力学分析和计算

Ag-Ge合金相图的热力学分析和计算 THERMODYNAMIC ANALYSIS AND CALCULATION OF BINARY PHASE DIAGRAM OF Ag-Ge ALLOYS 胡昌霁 Hu Changji Zou Yuelin Tian Decheng 1 first-author 邹粤林 1 田德诚 1 武汉大学物理系 武汉大学物理系 Deparment of Phpsics, Wuhan University Deparment of Phpsics, Wuhan University 对现有Ag-Ge合金相图的液相线进行了热力学分析,得到Ag-Ge液态合金的过剩摩尔自由焓随成分变化的四参量表示式。计算得到:当x G · < 0.25时,混合热H M < 0,当x G · > 0.25时,H M > 0,说明原子间交互作用强烈与成分有关。对实验尚未准确测定的Ag基固溶体的固相线进行了计算。 Thermodynamic analysis has been made for binary Ag-Ge phase diagram The excess free enthalpy of the liquid alloys can be expressed as G E =(A 1 x Ag 3 +A 2 x Ag x Ge +A 3 x Ag x Ge 2 +Ax Ge 3 )x Ag x Ge where A 1 =-2245 cal/mol A 2 =3556 cal/mol A 3 =2870 cal/mol A 4 =2090 cal/mol. The calculated thermodynamic quantities of the liquid alloys are in consi-stence with the experimental values, in particular when x（Ge） < 0.26, H M < 0 and x Ge > 0.26, H M > 0, which shows the strong composition dependence of in-teratomic interactions between Ag and Ge atoms. The liquidus in equilibrium with pure Ge has been calculated with newly determined melting point of Ge; The regular constant of solid Ag（Ge） solu-tions is shown to be A=8220-11.77T+9.335×10 -3 T 2 and the solvus of solid Ag（Ge）solution has been calculated to complete ex-perimental determination Ag-Ge系统 二元相图 热力学分析 Ag-Ge system binary phase diagram thermodynamic analysis 1989-03-01 2021-04-01 3