Abstract
Spherical Tb0.5Dy0.5(Fe1–xMnx)1.92 (x = 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, λ||, saturation ≈ 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.
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