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The structure and magnetostriction of R_0.5Pr_0.5Fex (R = Dy_0.7Tb_0.3,1.10 ≤x≤1.85) alloys were investigated. It was found that the matrix of arc-melting R_0.5Pr_0.5Fe_x alloys is the (Dy, Tb, Pr) Fe_2 phase with the MgCu_2-type cubic structure and the second phase is rare earth-rich phase when x<1.25. In the range of 1.40≤x<1.55, the second phase is (Dy, Tb, Pr)Fe_3 and it becomes the main phase when x >1.55. The crystalline structure of mechanically grinding R_0.5Pr_0.5Fe_x alloys is similar to that of the arc-melted alloys. The magnetostriction of the alloys increases with increasing Fe content when x ≤1.25 and decreases when x >1.25.
The was found that the matrix of arc-melting R_0.5Pr_0.5Fe_x alloys is the (Dy, Tb, Pr) Fe 2 phase with the MgCu 2 -type cubic structure and the second phase is rare earth-rich phase when x <1.25. In the range of 1.40 ≦ x <1.55, the second phase is (Dy, Tb, Pr) and it becomes the main phase when x> 1.55. The magnetometrical structure of mechanically grinding R_0.5Pr_0.5Fe_x alloys is similar to that of the arc-melted alloys. The magnetostriction of the alloys increases with increasing Fe content when x ≤1.25 when x> 1.25.