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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 1 073 K and a vertical section of RFe 2-RCo 2 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, Th 2Ni 17-type and Th 2Zn 17-type (Sm, Dy) 2(Fe, Co) 17. The (Sm, Dy) 6(Fe, Co) 23 phase dissolves 36% Co(mole fraction) at 1 073 K. However, the (Sm, Dy) 2(Fe, Co) 7 phase in R 2(Fe 1-xCo x) 7 alloys dissolves about 19% Fe(mole fraction) at 1 073 K.
Phase equilibria of the R-Fe-Co pseudoternary system with R ≦ 33.3% (mole fraction, R = Sm 0.5 Dy 0.5) were determined in an isothermal section at 1 073 K and a vertical section of RFe 2-RCo 2 by using OM There are seven intermetallic phases: (Sm, Dy) (Fe, Co) 2, (Sm, Dy) (Fe, Co) 3, (Sm, Dy) 6 (Sm, Dy) 2 (Fe, Co) 7 (Sm, Dy) (Fe, Co) 5 Th2Ni 17-type and Th2Zn 17-type (Sm, Dy) 2 (Fe, Co) (Sm, Dy) 2 (Fe, Co) 23 phase dissolves 36% Co (mole fraction) at 1 073 K. However, the (Sm, Dy) 2 1-x Co x) 7 alloys dissolves about 19% Fe (mole fraction) at 1 073 K.