Sm-Nd-Fe三元系相图(英文)  

Phase diagram of Sm-Nd-Fe ternary system

作　　者：王博文[1,2] 黄文美[1] 纪志超[1] 王志华[1] 孙英[1] 翁玲[1] 

机构地区：[1]河北工业大学电磁场与电器可靠性省部共建重点实验室,天津300130 [2]中国科学院国际材料物理中心,沈阳110016

出　　处：《中国有色金属学会会刊：英文版》2013年第6期1633-1638,共6页Transactions of Nonferrous Metals Society of China

基　　金：Projects(50971056,51171057)supported by the National Natural Science Foundation of China

摘　　要：采用金相显微镜、X射线衍射、电子探针和差热分析等技术确定了Sm-Nd-Fe三元系相图,包含Sm-Nd-Fe三元系500℃等温截面、SmFe2-NdFe2变温截面和(Sm0.88Nd0.12)Fex(1.6≤x≤2.4)变温截面。Sm-Nd-Fe三元系含有4种金属间化合物:(Sm,Nd)Fe2,(Sm,Nd)Fe3,(Sm,Nd)5Fe17,(Sm,Nd)2Fe17,不含(Sm,Nd)6Fe23相。500℃等温截面含有7个单相区,8个两相区,4个三相区。SmFe2-NdFe2变温截面含有2个单相区,4个两相区,7个三相区。(Sm0.88Nd0.12)Fe1.6-(Sm0.88Nd0.12)Fe2.4含有2个单相区,5个两相区,2个三相区。当x≤0.5时,(Sm1-xNdx)Fe2合金的包晶转变温度随着Nd含量的增加而降低,表明以Nd代替Sm从而使(Sm,Nd)Fe2相的稳定性降低。Phase equilibria of the Sm-Nd-Fe ternary system were determined in an isothermal section of 500 ℃ and vertical sections of SmFe2-NdFe2 and(Sm0.86Nd0.12)Fex(1.6≤x≤2.4) by optical microscopy,X-ray diffraction analysis,electron probe microanalysis(EPMA),and differential thermal analysis(DTA) techniques.There are four intermetallic phases:(Sm,Nd)Fe2,(Sm,Nd)Fe3,(Sm,Nd)5Fe17 and(Sm,Nd)2Fe17 in the Sm-Nd-Fe ternary system,and no(Sm,Nd)6Fe23 phase exists in this system.The isothermal section of 500 ℃ possesses 7 single-phase regions,8 two-phase regions,and 4 three-phase regions.The vertical section of SmFe2-NdFe2 contains 2 single-phase regions,4 two-phase regions,and 7 three-phase regions,and that of(Sm0.88Nd0.12)Fex consists of 2 single-phase regions,5 two-phase regions,and 2 three-phase regions.The peritectic temperatures for(Sm1-xNdx)Fe2 alloys decrease with increasing the Nd content when x≤0.5,and the substitution of Nd for Sm makes the stability of(Sm,Nd)Fe2 phase decrease.

关 键 词：Sm-Nd-Fe系 相图 结构 化合物 

分 类 号：TM27[一般工业技术—材料科学与工程]