<100> Fe-Ga magnetostriction material on axial orientation and method of preparing the same

Abstract

The invention discloses a <, a 100>, an axial orientation Fe-Ga magnetostriction material and the preparation method thereof. The material composites are Fe1-x-yGaxAly; wherein, x is between 16 per cent and 21 per cent or 25 per cent and 28 per cent; y is between 0 per cent and 10 per cent; the rest part is iron. The preparation method is that the raw material is melted under the protection of the inert gas, and the improved percy williams bridgman method is adopted to prepare the Fe-Ga magnetostriction material through the directional solidification; The heat treatment conditions are that the material is preserved at 1100 DEG C. to 1200 DEG C. for 0.5 hours to 24 hours, cooled with the furnace till 900 DEG C. to 750 DEG C. for 0.5 hours to 24 hours temperature preservation and then quenched or cooled by air to room temperature; or the material is preserved at 1100 DEG C. to 1200 DEG C. temperature for 0.5 hours to 24 hours and is cooled with the furnace till 500 to 700 DEG C..

Description

technical field [0001] The invention relates to a magnetostrictive material composition and a preparation method thereof. More specifically, it refers to a Fe-Ga magnetostrictive material with high magnetic field sensitivity and <100> axial orientation and a preparation method thereof. Background technique [0002] Magnetostrictive materials have the property of recovering from deformation in the presence of an applied magnetic field and changing their magnetic properties when stress is applied. But of all ferromagnetic materials, only those with large magnetostriction at low fields are suitable for applications like actuators and sensors. For early magnetostrictive materials such as nickel-based alloys and iron-based alloys, the saturation magnetostriction coefficient is generally 40-100×10 -6 , because the saturation magnetostriction coefficient of this kind of material is too small, so the scope of application is limited. Piezoelectric ceramics (such as lead zirc...

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Problems solved by technology

But its degree of orientation is not high, and due to the limitations of the zone melting method itself, it is not suitable for the preparation of large-scale materials

[0006] Chinese patent CN 1392616A discloses a Fe-Ga magnetostrictive material and a method for preparing single crystal or polycrystalline Fe-Ga magnetostrictive material by high temperature gradient rapid directional solidification method or pulling method or Bridgman, its process: After the alloy is smelted, it needs to be cast into a round bar first, then remove the scale and impurities, and then perform directional solidification. The process is more complicated and causes waste of raw materials.

[0007] Japanese patent JP2003286550 discloses a Fe-Ga giant magnetostrictive material. The polycrystalline Fe-Ga alloy is prepared by a rapid solidification method. Although it also has a strong orientation along the thickness direction of the strip, the magnetostriction coefficient is Up to 400×10 -6 , but a very high magnetic field (>1000KA / m) is required in use, and the magnetic field sensitivity is low, which limits its application

[0008] U.S. Patent WO0155687 and US2003010405, the announced Fe-Ga alloy, it is characterized in that: the monocrystalline Fe-Ga alloy that it prepares is axial orientation, has higher magnetostrictive property, but its cost is higher; The polycrystalline Fe-Ga alloy prepared by DS and DG (directional growth) processes, although its magnetostriction coefficient exceeds 150×10 -6 , but the DS process cannot control the temperature gradient and cooling rate, so the crystallographic orientation of the crystal cannot be artificially controlled, and it is difficult to obtain a higher orientation; the DG process can obtain the Fe- Ga alloy, but the alloy needs to be smelted in an electric arc furnace first, then the alloy ingot is heated and melted in a quartz tube, and then directional solidified, so the process is also more complicated

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