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A kind of magnetic field driven deformation memory alloy and preparation method thereof

A memory alloy and magnetic field-driven technology, applied in the field of shape memory alloys, can solve problems such as hindering the research and application of alloys, unsatisfactory repeatable performance, and difficult to predict prospects, so as to achieve excellent mechanical properties and magnetic properties, broaden the scope of use, Effect of wide magneto-strain temperature range

Active Publication Date: 2017-09-12
来安县永阳知识产权运营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nowadays, both at home and abroad are actively researching and discussing the performance characteristics and applications of magnetically controlled shape memory alloys, hoping to obtain further breakthroughs. Its prospects are difficult to predict, and it is expected to change the current process of world industrial development.
However, conventional magnetically controlled shape memory alloys have defects such as severe single crystal segregation, poor polycrystalline toughness, unsatisfactory repeatability and low Curie point, which greatly hinder the research and application of the alloy. A new type of magnetic control shape memory alloy with good mechanical properties, room temperature martensitic transformation temperature and large magnetic strain capacity to realize its industrial promotion

Method used

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  • A kind of magnetic field driven deformation memory alloy and preparation method thereof
  • A kind of magnetic field driven deformation memory alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The composition of the preparation is Co 42 Ni 32 al 25.5 Fe 0.5 The shape memory alloy with magnetic field controllable deformation, its preparation method is as follows:

[0025] (1) Weighing Co, Ni, Al, Fe with a purity of 99.9% respectively;

[0026] (2) Put the weighed raw materials in the crucible, and use vacuum melting. The melting conditions are: a.1×10 -2 MPa vacuum state; b. The melting temperature is 1300°C; c. The melting process uses magnetic stirring; d. The melting time is 1 hour.

[0027] (3) Carry out vacuum magnetic field heat treatment to the above-mentioned smelted alloy ingot, the treatment conditions are: temperature 450°C; time: 24 hours; vacuum degree: 1×10 -3 Mpa; Applied magnetic field strength: 1×0 5 A·m -1 .

[0028] (4) Then cool with the furnace, the cooling rate range is: 0.01°C / s; the magnetic field reduction rate is: 1000A m -1 ·s -1 ; Cool to room temperature and take out to obtain the final shape memory alloy.

[0029] The ...

Embodiment 2

[0031] The composition of the preparation is Co 41 Ni 32 al 24 Fe 3 The shape memory alloy with magnetic field controllable deformation, its preparation method is as follows:

[0032] (1) Weighing Co, Ni, Al, Fe with a purity of 99.9% respectively;

[0033] (2) Place the weighed raw materials in a crucible, and use vacuum melting. The melting conditions are: a.9×10 -3 MPa vacuum state; b. The melting temperature is 1350°C; c. The melting process uses magnetic stirring; d. The melting time is 0.75 hours.

[0034] (3) Carry out vacuum magnetic field heat treatment to the above-mentioned smelted alloy ingot, the treatment conditions are: temperature 500°C; time: 18 hours; vacuum degree: 8×10 -3 Mpa; Applied magnetic field strength: 1×10 6 A·m -1 .

[0035] (4) Subsequent cooling with the furnace, the cooling rate range is: 0.1°C / s; the magnetic field reduction rate is: 3000A m -1 ·s -1 ; Cool to room temperature and take out to obtain the final shape memory alloy.

[0...

Embodiment 3

[0038] The composition of the preparation is Co 40 Ni 30 al 24 Fe 6 The shape memory alloy with magnetic field controllable deformation, its preparation method is as follows:

[0039] (1) Weighing Co, Ni, Al, Fe with a purity of 99.9% respectively;

[0040] (2) Put the weighed raw materials in the crucible, and use vacuum melting, the melting conditions are: a.7×10 -3 MPa vacuum state; b. The melting temperature is 1400°C; c. The melting process uses magnetic stirring; d. The melting time is 0.6 hours.

[0041] (3) Carry out vacuum magnetic field heat treatment to the above-mentioned smelted alloy ingot, the treatment conditions are: temperature 530°C; time: 15 hours; vacuum degree: 6×10 -3 Mpa; Applied magnetic field strength: 1×10 6 A·m -1 .

[0042] (4) Then cool with the furnace, the cooling rate range is: 0.3°C / s; the magnetic field reduction rate is: 5000A m -1 ·s -1 ; Cool to room temperature and take out to obtain the final shape memory alloy.

[0043] The p...

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Abstract

The invention provides a memory alloy driven by a magnetic field to deform and a preparing method of the memory alloy, and belongs to the field of shape memory alloys. The alloy has the capability that deformation is generated through control of an outer magnetic field under the room temperature condition and is a magnetic control shape memory alloy capable of generating recoverable strain under the room temperature condition through martensite twin boundary migration and reverse migration driven by the outer magnetic field changes. The chemical formula of the alloy is CoxNiyAlzFej, wherein x is larger than or equal to 28 but smaller than or equal to 42, y is larger than or equal to 25 but smaller than or equal to 32, z is larger than or equal to 23 but smaller than or equal to 37, j is larger than or equal to 0.5 but smaller than or equal to 10, the sum of x, y, z and j is 100, and x, y, z and j represent mol percentage content. Compared with existing materials, an Fe-Co intermetallic compound exists in a microstructure of the magnetic control shape memory alloy, the alloy has a wide magnetic-induced strain temperature range, large magnetic-induced strain capacity and good mechanical performance, and the magnetic control shape memory alloy can be importantly applied to the fields such as high-precision drivers and executers used at the room temperature.

Description

technical field [0001] The invention belongs to the field of shape memory alloys, in particular to a magnetic field driven deformation memory alloy and a preparation method thereof. Background technique [0002] Magnetically controlled shape memory alloy is a new type of shape memory material. It not only has the thermoelastic shape memory effect controlled by the temperature field of traditional shape memory alloys, but also has the magnetically controlled shape memory effect controlled by the magnetic field. It also has a large recoverable Comprehensive characteristics such as magnetically induced strain, high response frequency and precise control. The current typical ferromagnetic shape memory alloy systems include Ni-Mn-Ga, Ni-Fe-Ga, Fe-based alloys (Fe-Pd, Fe-Ni-Co-Ti, etc.) and Co-based alloys (Co-Ni, Co- Mn-based alloys, etc.), etc. [0003] At present, magnetically controlled shape memory alloys are one of the most commonly used materials in the basic research and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22F1/02C22C30/00
CPCC22C1/02C22C19/07C22C30/00C22F1/006C22F1/02C22F1/10
Inventor 巨佳巴志新郝帅黄成戈胡师东闫良玉杨柳毛麒童
Owner 来安县永阳知识产权运营有限公司
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