Phase Transformation and Magnetostriction of (R-Pr)(Fe-T)_2 (R=Dy Tb; T=Co, Ni)

Structure and magnetostriction of Dy1-Pr_x Fe_2 (0≤x≤0.5), Dy_0.6Pr_0.4(Fe_1-_yT_y)_2 (0≤y≤0.6), and Tb_1-z Pr_z(Fe_0.4Co_0.6)_2 (0≤z≤1.0) alloys (T=Co, Ni) have been investigated. It is found that the matrix of the alloys Dy_1-xPr_xFe_2 is a single phase (Dy, Pr)Fe_2 with MgCu_2-type structure and the second phase is (Dy, Pr)Fe_3 when x≤0.2. The amount of (Dy, Pr)Fe_3 phase increases with increasing Pr content and becomes the main phase when x=0.4. The matrix of Dy1_-x.Pr_xFe_2 is found to be the (Dy, Pr)_2Fe_17 phase with Th_2Zn_17-type structure when x=0.5. It is found that the amount of the cubic Laves phase (Dy, Pr)(Fe, Co)_2 in the Dy_0.6Pr_0.4(Fe_l-Co_y)2 increases with increasing Co concentration when 0≤y≤0.6. The substitution of Ni for Fe is nearly not favorable for the formation of the cubic Laves phase (Dy, Pr)(Fe, Ni)_2 in (Dy_1-xPr_x)Fe_2. The matrix of (Tb_1-z Pr_z)(Fe_0.4Co_0.6)_2 is a (Tb, Pr)(Fe, Co)_2 phase with the MgC_u2-type cubic Laves structure and a second phase of small amount is (Tb. Pr)(Fe, Co)_3 phase when z≤O.2, z=0.5 and 1.0. When 0.2<z≤0.4, the amount of the (Tb, Pr)(Fe, Co)_3 phase with PuNi_3-type structure increases with increasing z and becomes the main phase when z=0.4. When 0.5<z≤0.6 the amount of the (Tb, Pr)(Fe, Co)_3 phase increases sharply, whereas for 0.6<z≤0.8 it decreases with increasing z. The polycrystalline magnetostriction, λ｜｜ - λ｜. at room temperature of Dy_l-xPr_xFe_2 exhibits a peak when x=0.3. The λ｜｜ - λ｜ for Dy_0.6Pr_0.4(Fe_1-y.M_y)_2 (M=Co, Ni) and Tb_l-zPrz(Fe_0.4Co_0.6)_2 is also examined.