31 March 2009 Effects of particle size on magnetostrictive properties of magnetostrictive composites with low particulate volume fraction
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Abstract
In the past ten years, there have been several investigations on the effects of particle size on magnetostrictive properties of polymer-bonded Terfenol-D composites, but they didn't get an agreement. To solve the conflict among them, Terfenol-D/unsaturated polyester resin composite samples were prepared from Tb0.3Dy0.7Fe2 powder with 20% volume fraction in six particle-size ranges (30-53, 53-150, 150-300, 300-450, 450-500 and 30-500μm). Then their magnetostrictive properties were tested. The results indicate the 53-150μm distribution presents the largest static and dynamic magnetostriction among the five monodispersed distribution samples. But the 30-500μm (polydispersed) distribution shows even larger response than 53-150μm distribution. It indicates the particle size level plays a doubleedged sword on magnetostrictive properties of magnetostrictive composites. The existence of the optimal particle size to prepare polymer-bonded Terfenol-D, whose composition is Tb0.3Dy0.7Fe2, is resulted from the competition between the positive effects and negative effects of increasing particle size. At small particle size level, the voids and the demagnetization effect decrease significantly with increasing particle size and leads to the increase of magnetostriction; while at lager particle size level, the percentage of single-crystal particles and packing density becomes increasingly smaller with increasing particle size and results in the decrease of magnetostriction. The reason for the other scholars got different results is analyzed.
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Xufeng Dong, Xufeng Dong, Xinchun Guan, Xinchun Guan, Jinping Ou, Jinping Ou, } "Effects of particle size on magnetostrictive properties of magnetostrictive composites with low particulate volume fraction", Proc. SPIE 7289, Behavior and Mechanics of Multifunctional Materials and Composites 2009, 728920 (31 March 2009); doi: 10.1117/12.815711; https://doi.org/10.1117/12.815711
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