Magnetostriction, Curie temperature and microstructure of Tb 0.29(Dy 1− xPr x) 0.71Fe 1.97 oriented alloys

Abstract

The Tb 0.29(Dy 1− x Pr x ) 0.71Fe 1.97 ( x=0, 0.1, 0.2 and 0.3) alloys were prepared by directional solidification method. The orientation, magnetostriction λ, Curie temperature T c and microstructure of alloys were characterized by XRD, standard resistant strain gauge technique, VSM and SEM-EDS. The results reveal that the alloys have a preferred orientation of 〈1 1 0〉 and 〈1 1 3〉 direction when x>0. With the increase in Pr content, the T c of alloys decreases gradually and the non-cubic phase appears, resulting in the decline of λ dramatically, from 1935.2×10 −6 for x=0 to 695.9×10 −6 for x=0.3 at a compressive stress of 6 MPa and a magnetic field of H=240 kA m −1.