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A kind of preparation method of high temperature, high strength ni-mn-ga-nb memory alloy

A memory alloy, high-strength technology, applied in the field of high-strength Ni-Mn-Ga-Nb memory alloy preparation, can solve the problem of high brittleness of Ni-Mn-Ga bulk materials, limiting the application and development of materials engineering, and low restoring force and other problems, to achieve the effect of simple operation, high toughness and stable alloy performance

Active Publication Date: 2018-10-02
DALIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, Ni-Mn-Ga bulk materials still have disadvantages such as high brittleness, low strength and low recovery force, which greatly limit the engineering application and development of this material.
These have become the main bottlenecks in the application and development of magnetically driven memory alloys

Method used

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  • A kind of preparation method of high temperature, high strength ni-mn-ga-nb memory alloy
  • A kind of preparation method of high temperature, high strength ni-mn-ga-nb memory alloy
  • A kind of preparation method of high temperature, high strength ni-mn-ga-nb memory alloy

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Embodiment 1

[0026] The high-strength Ni of this embodiment 54-x mn 25 Ga 21 Nb x (x=0.1) The preparation method of the memory alloy is prepared as follows: according to the atomic percentage, 53.9 parts of Ni, 25 parts of Mn, 21 parts of Ga and 0.1 part of rare element Nb are put into a vacuum medium frequency induction melting furnace, according to the following order Place the raw materials in order: first place the rare element Nb, then place the Ni sheet, and finally put the Mn sheet and Ga element in the smelting furnace for standby, and close the side furnace door. Before smelting, vacuumize to 6.67×10 with mechanical pump and Roots pump -3Pa, then filled with high-purity argon to 0.5Pa. Start smelting and control the smelting power to 450Kw. When the melted metal liquid is fully mixed, finally add the Mn sheet, pour the alloy liquid into the rod-shaped mold for 3-5 minutes, and obtain a rod-shaped sample of Φ12mm×60mm, and take it out after it is cooled. The test materials we...

Embodiment 2

[0028] The high-strength Ni of this embodiment 54-x mn 25 Ga 21 Nb x (x=0.2) The preparation method of the memory alloy is prepared as follows: according to the atomic percentage, 53.8 parts of Ni, 25 parts of Mn, 21 parts of Ga and 0.2 parts of rare element Nb are put into a vacuum intermediate frequency induction melting furnace, according to the following order Place the raw materials in order: first place the rare element Nb, then place the Ni sheet, and finally put the Mn sheet and Ga element in the smelting furnace for standby, and close the side furnace door. Before smelting, vacuumize to 6.67×10 with mechanical pump and Roots pump -3 Pa, then filled with high-purity argon to 0.5Pa. Start smelting and control the smelting power to 450Kw. Due to the melting principle of the intermediate frequency induction itself, the melted metal liquid will flow and stir under the action of the electromagnetic field. When the melted metal liquid is fully mixed, finally add the Mn...

Embodiment 3

[0030] The high-strength Ni of this embodiment 54-x mn 25 Ga 21 Nb x (x=0.5) The preparation method of memory alloy is prepared as follows: get 53.5 parts of Ni, 25 parts of Mn, 21 parts of Ga and 0.5 parts of rare element Nb according to the atomic percentage and put it into a vacuum intermediate frequency induction melting furnace, Place the raw materials in the following order: first place the rare element Nb, then place the Ni sheet, and finally put the Mn sheet and Ga element in the smelting furnace for standby, and close the side furnace door. Before smelting, vacuumize to 6.67×10 with mechanical pump and Roots pump -3 Pa, then filled with high-purity argon to 0.5Pa. Start smelting and control the smelting power to 450Kw. Due to the melting principle of the intermediate frequency induction itself, the melted metal liquid will flow and stir under the action of the electromagnetic field. When the melted metal liquid is fully mixed, finally add the Mn sheet, pour the ...

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Abstract

The invention relates to a preparation method of high-temperature and high-strength Ni-Mn-Ga-Nb memory alloy. The preparation method comprises the steps that Ni, Mn, Ga and Nb are taken according to the atomic percent and placed into a vacuum medium-frequency induction melting furnace to be molten, the melting power is controlled to be not higher than 500 Kw, a sample is obtained, the sample is cooled, cut and polished, surface impurities are removed, the sample is cleaned and sealed into a quartz tube and is subjected to heat preservation for 5 h at 900 DEG C, and then the sample is quenched into ice water to obtain the high-temperature high-ductility shape memory alloy. The breaking strength and breaking strain of the prepared high-temperature and high-strength Ni-Mn-Ga-Nb memory alloy are increased and then reduced along with increasing of the content of the Nb element, the highest breaking strength reaches 5441 MPa, the highest breaking strain is 20.6%, which is never achieved in Ni-Mn-Ga alloy, and the high-temperature and high-strength Ni-Mn-Ga-Nb memory alloy can be used as the novel material for memory alloy application and development.

Description

technical field [0001] The invention relates to a preparation method of a high-strength Ni-Mn-Ga-Nb memory alloy. Background technique [0002] Ni-Mn-Ga shape memory alloy is a new type of intelligent ferromagnetic shape memory material, which has both thermoelastic martensitic phase transformation and ferromagnetic transformation. It not only has the shape memory effect of traditional shape memory alloys controlled by temperature field, but also The shape memory effect can be produced under the action of a magnetic field. The response frequency of its magnetically controlled shape memory effect is close to that of piezoelectric ceramics, and the output strain is close to that of traditional temperature-controlled shape memory alloys. It is a smart material with great engineering application prospects. Because of its unique characteristics, it can also be widely used in drivers and sensors. [0003] However, Ni-Mn-Ga bulk materials still have disadvantages such as high bri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/03C22C1/02C22F1/10
CPCC22C1/023C22C19/03C22F1/002C22F1/10
Inventor 董桂馥张倩倩王兴安
Owner DALIAN UNIV