A thermodynamic re-modeling of the Co-Fe-Gd system

作     者：王嵬 郭翠萍 李长荣 杜振民 WANG Wei;GUO Cuiping;LI Changrong;DU Zhenmin

作者机构：Department of Materials Science and EngineeringUniversity of Science and Technology Beijing School of Chemical EngineeringNortheast Dianli University 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2012年第30卷第10期

页      面：1055-1063页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 07[理学] 070205[理学-凝聚态物理] 0708[理学-地球物理学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：Project supported by National Natural Science Foundation of China(50934011 50971027) 

主　　题：Co-Fe-Gd system CALPHAD technique phase diagram thermodynamic properties rare earths 

摘      要：The Fe-Gd and Co-Fe-Gd systems were optimized by means of the CALPHAD （CALculation of PHAse Diagram） technique. The solution phases, liquid, bcc, fcc and hcp, were described by the substitutional solution model. For the Fe-Gd system, the compounds Fe23Gd6,Fe3Gd and Fe2Gd with no solubility ranges were treated as stoichiometric compounds. According to the CaCu5-type structure of the intermetallic compounds Fe17Gd2,it was reasonable to adopt a three-sulattice model （Fe2,Gd）Gd2Fe15 in the Fe-Gd system, and this model was also adopted as （Co2,Fe2,Gd）（Co2,Gd）2（Co,Fe）15 to describe the compounds （Co,Fe）17Gd2 and （Co,Fe）5Gd in the Co-Fe-Gd ternary system. The other compounds were treated as the line compounds （Co,Fe）mGdn and no ternary compound had been reported in the Co-Fe-Gd system. The thermodynamic description of the Co-Fe and Co-Gd system were taken from literatures. A self-consistent thermodynamic description of the Co-Fe-Gd system was obtained.