Abstract
In this work, Tb0.27Dy0.73Fe1.95 alloys were solidified in a high magnetic field of 4.4 T at various cooling rates. Changes in the magnetostriction, crystal orientation, magnetization, and magnetic domain of the solidified alloys were investigated. The application of the magnetic field can induce <111> orientation of (Tb, Dy)Fe2 phase. However, the effect of the magnetic field is strongly dependent on the cooling rate. The alloy solidified at 5 °C/min shows the highest magnetostriction, strongest <111> orientation, best contrast of light and dark in the domain image, and fastest magnetization, and followed in descending order by the alloys solidified at 1.5 °C/min and 60 °C/min. The change in the magnetostriction of the alloys can be attributed to the changes in crystal orientation and magnetic domain structure caused by both the magnetic field and cooling rate.
Highlights
The TbxDy1 xFey (x=0.2–0.35, y=1.9–2.0) compound, so called Terfenol-D, has excellent magnetostrictive properties and shows potential in various applications, including sensors, precision machinery, and magnetomechanical transducers.[1,2] In this system, the magnetostrictive phase (Tb, Dy)Fe2 has a C15-type cubic Laves phase structure
Our previous studies prove that it is possible to improve the magnetostrictive performance of Tb-Dy-Fe compounds by applying a high magnetic field during solidification
We report the simultaneous measurements of magnetostriction, crystal orientation, magnetization, and magnetic domain performed for the Tb0:27Dy0:73Fe1:95 alloys prepared in a high magnetic field at various cooling rates
Summary
The TbxDy1 xFey (x=0.2–0.35, y=1.9–2.0) compound, so called Terfenol-D, has excellent magnetostrictive properties and shows potential in various applications, including sensors, precision machinery, and magnetomechanical transducers.[1,2] In this system, the magnetostrictive phase (Tb, Dy)Fe2 has a C15-type cubic Laves phase structure. It has an easy magnetization axis along its direction, and shows a huge magnetostrictive anisotropy.[3] extensive efforts have been made to achieve a crystallographic orientation along or close to the direction. The relations among the domain structure, crystal orientation, magnetic properties, and magnetostrictive performance will be briefly discussed
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