Abstract
In this work, Tb0.27Dy0.73Fe1.95 alloys were solidified in a high magnetic field gradient (8.8 T, -565 T2/m) at various cooling rates. Changes in the magnetostriction, crystal orientation, and magnetization of the alloys were investigated. The application of the magnetic field gradient has a strong influence on the magnetostrictive performance. At lower cooling rates, the maximum magnetostriction increases gradually with depth from the top surface of the alloys. However, the effect of the magnetic field gradient is strongly dependent on the cooling rate. With increasing cooling rate, the magnetostriction gradient decreases. The magnetization measurement shows that the saturation magnetization at lower cooling rates increases gradually with depth from the top surface of the alloys. However, with increasing cooling rate, the increase in the saturation magnetization is reduced. The XRD measurement results show that the orientation behavior of the (Tb, Dy)Fe2 phase exhibits a continuous change throughout the alloys at lower cooling rates, but is almost unchanged at higher cooling rates. The change in the magnetostriction of the alloys can be attributed to the changes in crystal orientation and the amount of the (Tb, Dy)Fe2 phase in the alloys caused by both the magnetic field gradient and cooling rate.
Highlights
INTRODUCTIONControl of the microstructure and corresponding magnetostrictive properties of Tb0.27Dy0.73Fe1.95 alloys using high magnetic field gradients
Giant magnetostrictive materials are a new kind of functional material that has the features of large magnetostriction strain, rapid response, and low frequency
Tb0.27Dy0.73Fe1.95 alloys were solidified in a high magnetic field gradient (8.8 T, -565 T2/m) at various cooling rates
Summary
Control of the microstructure and corresponding magnetostrictive properties of Tb0.27Dy0.73Fe1.95 alloys using high magnetic field gradients. Tb0.27Dy0.73Fe1.95 alloys were solidified in a high magnetic field gradient at various cooling rates. Crystal orientation, and magnetization of the alloys were investigated. A gradient distribution of the magnetostriction throughout the alloys was obtained. This magnetostriction gradient was shown to strongly depend on the cooling rate. The effect of the cooling rate on the microstructural and magnetostriction changes in the alloys is briefly discussed
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