Thermodynamic assessment of Au-Pt system  

Au-Pt二元合金的热力学评估(英文)

作　　者：徐晓宁[1] 任玉平[1] 李长发[2] 李松[1] 秦高梧[1] 

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,沈阳110819 [2]天津理工大学材料科学与工程学院,天津300384

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第6期1432-1436,共5页中国有色金属学报（英文版）

基　　金：Project (50871028) supported by the National Natural Science Foundation of China;Projects (N100702001,N090502002) supported by the Fundamental Research Funds for the Central Universities,China;Project (NCET-09-0272) supported by the Program for New Century Excellent Talents in University of Ministry of Education, China;Project (200803) supported by Northeastern University Research Foundation for Doctor Candidates,China

摘　　要：The thermodynamic re-assessment of Au-Pt binary system was carried out by using the Calphad method and based on the recent experimental data. The Gibbs energies of face-centred cubic and liquid phases were described by a sub-regular solution model with the Redlich-Kister equation. Much effort was taken to reproduce the phase equilibrium results and thermodynamic properties of the solid phase, including the activity and mixing enthalpy. The constraint of the third law of thermodynamics was also considered in the assessment. According to the presently assessed results, the miscibility gap region in the Au-Pt system slightly shifts to the Au-rich side, and the critical !0oint of the miscibility gap is about 1200 ℃ and Au-56% Pt.基于最近实验测得的Au-Pt二元体系相平衡数据,利用Calphad方法重新评估Au-Pt二元体系的热力学参数。采用亚正规溶体模型Redlich-Kister等式描述液相和面心立方相的Gibbs自由能。考虑热力学第三定律的限定,以再现相平衡数据和固相热力学性质,包括活度和混合焓,优化Au-Pt二元系统热力学参数。优化结果表明:Au-Pt合金系统的溶解度间隙边界向富Au侧偏移,其顶点位置在1200°C,Au-56%Pt。

关 键 词：Au-Pt system phase diagram thermodynamic assessment Calphad method 

分 类 号：TG131[一般工业技术—材料科学与工程]