Phase diagram of R-Fe-Co pseudoternary system with R≤33.3 %(mole fraction, R=Sm_0.5Dy_0.5)

来源期刊：中国有色金属学报(英文版)2002年第5期

论文作者：王博文 刘炜丽 封文江 金光 郝延明 李养贤

文章页码：850 - 853

Key words：rare earth-iron-cobalt; phase diagram; structure; compounds

Abstract: Phase equilibria of the R-Fe-Co pseudoternary system with R≤33.3%(mole fraction, R=Sm_0.5Dy_0.5) were determined in an isothermal section at 1073K and a vertical section of RFe₂-RCo₂ by using OM, X-ray diffractometer, EPMA DTA techniques. There are seven intermetallic phases: (Sm, Dy)(Fe, Co)₂, (Sm, Dy)(Fe, Co)₃, (Sm, Dy)₆(Fe, Co)₂₃, (Sm, Dy)₂(Fe, Co)₇, (Sm, Dy)(Fe, Co)₅, Th₂Ni₁₇-type and Th₂Zn₁₇-type (Sm, Dy)₂(Fe, Co)₁₇. The (Sm, Dy)₆(Fe, Co)₂₃ phase dissolves 36% Co(mole fraction) at 1073K. However, the (Sm, Dy)₂(Fe, Co)₇ phase in R₂(Fe_1-xCo_x)₇ alloys dissolves about 19% Fe(mole fraction) at 1073K.