Thermodynamic assessment of Au-Zr system

被引:3
|
作者
李志华
金展鹏
刘华山
机构
[1] Central South University
[2] Central South University Changsha 410083
[3] China
[4] School of Materials Science and Engineering
关键词
Au-Zr system; CALPHAD; two-sublattice model;
D O I
暂无
中图分类号
TG111 [金属物理学];
学科分类号
0702 ; 070205 ;
摘要
Au-Zr binary system was reassessed by using the calculation phase diagram (CALPHAD) technique based on experimental thermodynamic data and newly reported phase diagrams. The excess Gibbs energies of the three terminal solutions and the liquid phases were formulated with Redlich-Kister polynomial. All the intermetallic phases were treated as stoichiometric compounds with the exception of ZrAu which is modeled by a two-sublattice model, (Au,Zr)∶(Au,Zr). The results show that there exist seven intermetallics: Zr3Au, Zr2Au, Zr5Au4, Zr7Au 10 , ZrAu2, ZrAu3, and ZrAu4 in the system. The eutectoid reaction: β (Zr) → α (Zr)+Zr3Au takes place at 1 048 K and the maximal solubility of Au in α -Zr is 4.7%(mole fraction). The maximal solubility of Zr in Au is 6.0% (mole fraction) at 1 347 K. The homogeneity range of ZrAu phase is about 44.5%-52.9%(mole fraction) of Au. The present assessment fits experimental data very well.
引用
收藏
页码:94 / 97
页数:4
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