Effects of manganese substitution on magnetic and magnetostrictive properties of Tb0.5Dy0.5(Fe1-xMnx)1.92/epoxy composites with spherical single-crystal particles*

Spherical Tb(0.5)Dy0.5(Fe1-xMnx)1.92 (x 1/4 0, 0.05, 0.10 and 0.15) single-crystal particles were prepared. The magnetic anisotropy of the alloy decreases as x increases from 0 to 0.15. Subsequently, we prepared giant magnetostrictive composites with these spherical Tb0.5Dy0.5(Fe1-xMnx)(1.92) single-crystal particles. As a consequence, well <111>-oriented Tb0.5Dy0.5(Fe1-xMnx)1.92 composites with 55 vol% Tb0.5Dy0.5(Fe1-xMnx)(1.92) particles were obtained. The Tb0.5Dy0.5(Fe0.9Mn0.1)2 composite manifests a good low-field magnetostrictive property and saturation magnetostriction at an axial pressure of 10 MPa, lambda|, (saturation) approximate to 2100 ppm, which is larger than that of the commercially available Terfenol-D (1400-1800 ppm). The preparation of composites with single crystal spherical powders may be an effective solution of developing high-performance magnetostrictive composites. (c) 2022 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.