| Galfenol (Fe-Ga) alloy is a newly developed model of the magnetostrictive material, which follows with the develop of Terfenol-D (Tb-Dy-Fe) alloy and Ni2MnGa alloy. When the non magnetic element Ga doped with substitutional solid solution formation in Fe, which can make the magnetostriction of pure Fe increased ten times and even a few times, at the same time the alloy has low saturation magnetization and low price, good mechanical properties and temperature characteristics, has great potential application value.Through the study of the alloy, Fe-Ga alloy has a very complex structure, is closely related with the heat treatment of alloy composition, preparation method, substitutional Ga atoms in solid solution in the form of different occupation, directly determines the ordering, the degree of disorder, and the size of the resulting atomic magnetic moment influence, the magnetostrictive properties of materials change. At present a large number of research results about Fe-Ga series magnetostrictive alloy showed that: reasonable alloy composition disordered A2or modified DO3phase structure and preferred orientation growth and is the prerequisite for the preparation of high performance Fe-Ga magnetostrictive alloy.Therefore, this paper from the alloy composition, phase structure, crystal orientation control, anisotropy and other aspects of the implementation were fabricated by rapid solidification Fe-Ga alloy thin belt and high undercooling of Fe-Ga alloy prepared by bulk composition, microstructure, properties of the material, two kinds of cooling form. The organization, structure and magnetic properties were discussed. From the angle of growth induced anisotropy, respectively, on the growth of alloy directional Fe-Ga (DG directional Growth) and directional solidification (DS directional Solidification) was studied, the effect of preferred orientation and elemental substitution and doping on the magnetostriction. Combined with the technology of directional solidification by using the rapid solidification of undercooled melts, the systematic study of the Fe-Ga alloy formed rapidly during directional solidification microstructure and magnetostriction. Starting from the magnetic domain rotation, in the process of domain wall displacement effect of magnetostrictive properties of angle, when rapid directional solidification technology for preparation of orientation of Fe-Ga alloy bars, by means of magnetic field induced magnetic anisotropy and magnetic field, the growth induced magnetic anisotropy and magnetic field induced magnetic anisotropy together, to strengthen anisotropic treatment process and effect were studied. Through exploring the factors on the material of the magnetic anisotropy and the crystal field effect and the influence of the magneto elastic performance changes triggered by the "preparation and application of giant magnetostrictive Fe-Ga alloy material" and provide a theoretical basis and technical support. |
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