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金属间化合物(Mg,Zn)_(12)Ce与(Mg,Zn)_(11)Ce的研究

Study on the Intermetallics( Mg,Zn)_(12)Ce and( Mg,Zn)_(11)Ce
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摘要 对300℃时Mg-Zn-Ce系富镁侧化合物的成分特征、结构和相平衡关系进行了研究.结果表明,Mg-Zn-Ce富镁角存在一个Mg12Ce的二元置换固溶体(Mg,Zn)12Ce,还存在一个三元线性化合物(Mg,Zn)11Ce(τ相).(Mg,Zn)12Ce中Zn的范围为0~7.3%(原子分数),其晶体结构为体心四方晶格.三元线性化合物τ相含Zn为8.5%~43.5%(原子分数),其晶体结构为C底心正交晶格.(Mg,Zn)12Ce和τ相均与α(Mg)存在稳定的两相平衡,且在Mg-Zn-Ce系富镁角还存在三相平衡Mg+(Mg,Zn)12Ce+τ. Phase composition,crystal structure and the relationship the phase equilibria in Mg-rich corner of Mg-Zn-Ce system at 300 ℃ were studied. The results showed that a substitution binary solid solution of Mg12 Ce identified as( Mg,Zn)12Ce and a linear ternary compound identified as( Mg,Zn)11Ce( τphase) were confirmed in Mg-rich corner of Mg-Zn-Ce system. The solid solubility of Zn in( Mg,Zn)12Ce is about 0 ~ 7. 3%( atomic fraction),and the crystal structure of which is a body-centered tetragonal lattice structure. The Zn content of the linear ternaty compound τ phase is from 8. 5% to 43. 5%( atomic fraction),and the crystal structure of it is a C-centered orthorhombic lattice. Both( Mg,Zn)12Ce and τ phase were identified to be in two-phase equilibrim with α( Mg). A three-phase equilibrium of Mg +( Mg,Zn)12Ce + τ in Mg-rich corner of Mg-Zn-Ce system was also identified.
出处 《东北大学学报(自然科学版)》 EI CAS CSCD 北大核心 2015年第6期796-799,810,共5页 Journal of Northeastern University(Natural Science)
基金 国家自然科学基金资助项目(51301032) 河北省自然科学基金资助项目(E2014501102)
关键词 Mg-Zn-Ce系 二元固溶体 三元线性化合物 相平衡 Mg-Zn-Ce alloys binary solid solution linear ternary compunds phase equilibrium
作者简介 黄明丽(1978-),女,黑龙江宝清人,东北大学副教授; 李洪晓(1968-),女,山东荣成人,东北大学教授; 丁桦(1958-),女,辽宁沈阳人,东北大学教授,博士生导师.
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