Abstract
Isoplethic section in the quaternary system Fe–Co–Sm–Pr at 800°C with Sm/Pr=1 and R⩽33.3 at% (R=Sm 0.5Pr 0.5) was determined by using optical microscopy, X-ray diffraction analysis and electron probe microanalysis. There are five intermetallic phases: (Sm,Pr)(Fe,Co) 2, (Sm,Pr)(Fe,Co) 3, (Sm,Pr) 2(Fe,Co) 7, (Sm,Pr) 5(Fe,Co) 19 and (Sm,Pr) 2(Fe,Co) 17. The isoplethic section of the Fe–Co–R system consists of eight single-phase regions, eleven two-phase regions and five three phase regions. The (Sm,Pr) 2(Fe,Co) 7 phase in R 2(Fe 1− x Co x ) 7 alloys dissolves nearly 15 at % Fe at 800°C and no (Sm,Pr)(Fe,Co) 5 phase exists.
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