Thermodynamic reassessment of Ga-Hg and Mg-Hg systems
来源期刊:中南大学学报(英文版)2009年第1期
论文作者:冯艳 彭超群 王日初 刘华山
文章页码:32 - 37
Key words:Ga-Hg system; Mg-Hg system; intermetallic phases; thermodynamic assessment; phase diagram; CALPHAD
Abstract: The Ga-Hg binary system was thermodynamically assessed by the CALPHAD method, but only configuration contributions were considered to the entropy of the liquid. The Mg-Hg binary system has not been assessed yet. In the assessments of the Ga-Hg and Mg-Hg binary systems, solutions including liquid and hcp (Mg) were treated as substitution solutions, of which the excess Gibbs energies were formulated with the Relich-Kister polynomial. The intermetallic phases in the Mg-Hg binary system, Mg3Hg, Mg5Hg2, Mg2Hg, Mg5Hg3, MgHg, and MgHg2, were described as stoichiometric compounds. Based on the reported experimental data and thermodynamic properties of the phase diagram, sets of self-consistent parameters describing all phases in the Ga-Hg and the Mg-Hg binary systems were obtained.