Thermodynamic assessment of Mg-Ga binary system

• Published in: Transactions of Nonferrous Metals Society of China Vol. 20; no. 3; pp. 450 - 457
• Main Author: 孟凡桂 王江 戎茂华 刘立斌 金展鹏
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.03.2010; Swiss Federal Laboratories for Materials Testing and Research,Laboratory for Joining and Interface Technol%School of Science, Hunan University of Technology, Zhuzhou 412008, China%School of Materials Science and Engineering, Central South University, Changsha 410083, China; School of Materials Science and Engineering, Central South University of Forestry and Technology,Changsha 410004, China%School of Materials Science and Engineering, Central South University, Changsha 410083, China
• Subjects: Assessments; Binary systems; CALPHAD method; Computer simulation; Magnesium; Mathematical models; Mg-based alloys; Mg-Ga binary system; phase diagram; Phase transformations; Phases; thermodynamic; Thermodynamics; 二元体系; 实验数据; 热力学; 相图计算; 能量自洽; 金属间化合物; thermodynamic; Mg-based alloys; phase diagram; CALPHAD method; Mg-Ga binary system
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(09)60161-8

In order to obtain the thermodynamic description of the Mg-Ga binary system,the thermodynamic assessment of the system was carried out using the CALPHAD method through Thermo-calc software package based on the evaluation of all available experimental data from the published literature.The solution phases,including liquid,hcp（Mg） and orthorhombic（Ga）,were described by the substitutional solution model,of which the excess Gibbs energies were expressed with the Redlich-Kister polynomial.Meanwhile,all intermetallic compounds,Mg5Ga2,Mg2Ga,MgGa,MgGa2 and Mg2Ga5,were modeled as stoichiometric compounds.A set of self-consistent thermodynamic parameters formulating the Gibbs energies of various phases in the Mg-Ga binary system were obtained finally.The much better agreement is achieved between the calculated results and the reported experimental data.