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The melting behavior,solid state phase transformation and structure of pseudo-ternary compounds Nd_2(Fe_(1-x)Ni_x)_(14)B andPr_2(Co_(1-y)Ni_y)_(14)B were studied using differential thermal analysis,optical microscopy X-ray diffraction,and electron probemicro-analysis techniques.At high temperature,eutectoid decomposition R_2(Ni,M)_(17)→R(Ni,M)_5+x-Ni(M) takes place in thesetwo pseudo-ternary compounds,in the composition range x=0.6～1.0 and y=0.3～1.0,respectively.When x(or y)≤0.2,bothNd_2(Fe_(1-x)Ni_x)_(14)B and Pr_2(Co_(1-y)Ni_y)_(14)B are single phase tetragonal.The phase constitutents of these two systems at room tempera-ture are similar in the composition range 0.6≤x(or y)≤1.0.
The melting behavior, solid state phase transformation and structure of pseudo-ternary compounds Nd 2 (Fe 1-x Ni x) _ (14) B and Pr 2 (Co_ (1-y) Ni_y) analysis, optical microscopy X-ray diffraction, and electron probemicro-analysis techniques. At high temperature, eutectoid decomposition R_2 (Ni, M) _ (17) → R (Ni, M) _5 + x- Bothtwo pseudo-ternary compounds, in the composition range x = 0.6-1.0 and y = 0.3-1.0, respectively.When x (or y) ≤0.2, bothNd_2 (Fe_ (1-x) Ni_x) (Co_ (1-y) Ni_y) _ (14) B are single phase tetragonal. The phase structures of these two systems at room tempera-ture are similar to the composition range 0.6 ≦ x (or y) ≦ 1.0.