Preparation method for improving mechanical property of giant magnetostrictive material
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A technology of giant magnetostriction and material mechanics, applied in the field of magnetic materials, can solve the problems of poor mechanical properties of giant magnetostrictive materials, and achieve the effects of easy industrial production, improved mechanical properties, and easy manufacture
Active Publication Date: 2014-11-19
UNIV OF SCI & TECH BEIJING
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[0006] The present invention addresses the following problems: the mechanical properties of giant magnetostrictive materials are poor, and common heat treatment methods cannot simultaneously suppress RFe 2 Phase growth, improving the distribution of rare earth-rich phases while reducing the distribution of microcracks and pores in the material, and proposing a preparation method to improve the mechanical properties of giant magnetostrictive materials
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Embodiment 1
[0021] Example 1: orientation Tb 0.27 Dy 0.73 Fe 1.95 The high-pressure heat treatment of the alloy is completed in the following steps:
[0022] 1. Preparation of Tb with orientation by batching, vacuum smelting, and directional solidification 0.27 Dy 0.73 Fe 1.95 Alloy, the size of which is 10mm in diameter and 100mm in length.
[0023] 2. Put the giant magnetostrictive material into a high-pressure heat treatment furnace, and start heating after vacuuming to 0.01Pa. And keep vacuuming during the heating process. After the temperature rises to 1020°C, stop vacuuming. Introduce high-purity argon to raise the pressure in the furnace to the specified pressure of 15MPa, and then keep it at 1020°C for 2h.
[0024] 3. Stop heating after the heat preservation is over, and take out the sample after cooling with the furnace.
[0025] 4. Machining.
[0026] 5. Finished product performance testing.
[0027] The comparison between its compressive performance and magnetostri...
Embodiment 2
[0030] Example 2: orientation Tb 0.27 Dy 0.73 Fe 1.95 The high-pressure heat treatment of the alloy is completed in the following steps:
[0031] 1. Preparation of Tb with orientation by batching, vacuum smelting, and directional solidification 0.27 Dy 0.73 Fe 1.95 Alloy, the size of which is 10mm in diameter and 100mm in length.
[0032]2. Put the giant magnetostrictive material into a high-pressure heat treatment furnace, and start heating after vacuuming to 0.01Pa. And keep vacuuming during the heating process. After the temperature rises to 1020°C, stop vacuuming. Introduce high-purity argon to raise the pressure in the furnace to the specified pressure of 20MPa, and then keep it at 1020°C for 2h.
[0033] 3. Stop heating after the heat preservation is over, and take out the sample after it cools down with the furnace.
[0034] 4. Machining.
[0035] 5. Finished product performance testing.
[0036] The comparison between its compressive performance and magnet...
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Abstract
The invention relates to a preparation method for improving the mechanical property of a giant magnetostrictive material, and belongs to the field of magnetic materials. The preparation method concretely comprises the following steps of preparing a giant magnetostrictive material terbium-dysprosium-iron alloy with specific orientation through blending, vacuum smelting and directional solidification; placing a sample to be treated into a heat treating furnace, vacuumizing to 0.01 Pa, and then starting heating; continuously vacuumizing in a temperature increasing process; after the temperature inside the heat treating furnace is increased to 800-1200 DEG C, stopping vacuumization; introducing high-purity argon to increase the pressure inside the heat treating furnace to 1-20 MPa, and preserving the heat for 30-180 minutes; after heat preservation is finished, stopping heating, and after the sample is cooled, taking out. According to the invention, the growth of an RFe2 phase contained in the terbium-dysprosium-iron alloy can be inhibited through high-pressure heat treatment; the holes and microcracks can be decreased by regulating the diffusion and separation of a rare earth-rich phase; the coalescence of the microcracks of the material is promoted, so that the mechanical property of the giant magnetostrictive material can be improved, the waste, which is caused due to poor mechanical property, of the material is reduced, and the requirement for usage under the condition of more working conditions is met. The preparation method disclosed by the invention is easy to operate and suitable for industrialized production.
Description
technical field [0001] The invention belongs to the field of magnetic materials, in particular to a preparation method for improving the mechanical properties of giant magnetostrictive materials. Background technique [0002] Rare earth giant magnetostrictive material (typical alloy composition Tb x Dy 1-x Fe y , x=0.27~0.35, y=1.9~2.0) has the advantages of high magnetostriction coefficient, high energy density, high energy conversion efficiency, fast response speed, etc. It has been applied in equipment such as high-precision and fast micro-displacement actuators, high-energy micro-mechanical power sources, and damping and vibration reduction systems, and continues to expand its application fields. However, the magnetostrictive properties of rare earth giant magnetostrictive materials originate from the RFe 2 (R=Tb, Dy) phase, which is an intermetallic compound with intrinsic brittleness and poor mechanical properties. At the same time, there are many holes and microc...
Claims
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