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The 1000℃ isothermal section of the Fe-rich portion of R-Fe-Al(R=Dy0.65Tb0.25Pr0.1) pseudoternary system has been investigated using optical microscopy,X-ray diffraction,EPMA and DTA techniques.The 1000℃ isothermal section consists of 9 single-phase regions,14 two-phase regions and 6 three-phase regions.In the R-Fe pseudobinary system,except the R2Fe17 compound,the homogeneity regions of other compounds are shifted towards the stoichiometric rare earth-rich side.With Fe partially substituted by Al,the homogeneity region of R(Fe1-xAlx)2 is shifted back to the stoichiometric composition when x=0.15 and remains little changed with 0.15≤x≤0.30.The homogeneity regions of R(Fe1-xAlx)3 and R6(Fe1-xAlx)23 are slightly shifted to the stoichiometric rare earth-rich side with increasing Al content.A vertical section along R=33.33 atomic percentage is also investigated.It consists of 2 single-phase regions,4 two-phase regions and 2 three-phase regions.
The 1000 ° C isothermal section of the Fe-rich portion of R-Fe-Al (R = Dy0.65Tb0.25Pr0.1) pseudoternary system has been investigated using optical microscopy, X-ray diffraction, EPMA and DTA techniques. 1000 ° C isothermal section consists of 9 single-phase regions, 14 two-phase regions and 6 three-phase regions. The R-Fe pseudobinary system, except the R2Fe17 compound, the homogeneity regions of other compounds are shifted towards the stoichiometric rare earth-rich .With Fe partially substituted by Al, the homogeneity region of R (Fe1-xAlx) 2 is shifted back to the stoichiometric composition when x = 0.15 and remains little changed with 0.15≤x≤0.30.The homogeneity regions of R (Fe1- xAlx) 3 and R6 (Fe1-xAlx) 23 are slightly shifted to the stoichiometric rare earth-rich side with increasing Al content. A vertical section along R = 33.33 atomic percentage is also investigated. It consists of 2 single-phase regions, 4 two-phase regions and 2 three-phase regions.