Low start threshold magnetic memory alloy and preparation method thereof

A memory alloy and start-up threshold technology, applied in the field of shape memory alloys, can solve the problems of increasing the use conditions and requirements of electronic devices, low strain start-up threshold, large magnetic strain, etc., to broaden the scope of industrial applications, low start-up valve value, the effect of good magnetic properties

Inactive Publication Date: 2020-02-21
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high start-up threshold of the magnetic strain of the existing ferromagnetic shape memory alloys under the external magnetic field, the sensor or electronic device prepared from this type of alloy must be under the intervention of a strong magnetic field to produce obvious magnetic strain. , which seriously increases the service conditions and requirements of this type of electronic devices, so it is expected to develop a new type of magnetically controlled shape memory alloy with good mechanical properties, large magnetic strain and low strain threshold to accelerate its industrial application and to promote

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  • Low start threshold magnetic memory alloy and preparation method thereof
  • Low start threshold magnetic memory alloy and preparation method thereof
  • Low start threshold magnetic memory alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepare 900g composition as Co 34.9 Ni 34.8 Al 29.7 PR 0.6 The low fatigue magnetic memory alloy, its preparation method is as follows:

[0027] S1. Ingredients: Weigh Co, Ni, Al, and Pr with a purity of 99.99% respectively;

[0028] S2. Melting: Put the prepared raw materials in a crucible for vacuum melting, the melting conditions are: a.1×10 -3 The low vacuum state of MPa; b. the smelting temperature is 1600 ℃; c. the smelting process adopts magnetic stirring; d. the smelting time is 150s (according to the formula t=K×(M -1 / 2 ) to obtain, where the element coefficient K is 5s·g -1 / 2 , M is 900g);

[0029] S3. Magnetic field heat treatment: The alloy ingot obtained by the above vacuum melting is subjected to vacuum magnetic field heat treatment, the treatment conditions are: temperature 660°C; time: 15 hours; vacuum degree: 1×10 -3 MPa; Applied magnetic field strength: 1×10 6 A·m -1 ; Magnetic field rise rate: 800A·m -1 ·s -1 ;

[0030]S4. Cooling; then co...

Embodiment 2

[0033] Prepare 800g composition as Co 33.1 Ni 35.3 al 30.9 PR 0.7 The low fatigue magnetic memory alloy, its preparation method is as follows:

[0034] S1. Ingredients: Weigh Co, Ni, Al, and Pr with a purity of 99.99% respectively;

[0035] S2. Melting: Put the prepared raw materials in a crucible for vacuum melting, the melting conditions are: a.2×10 -3 The low vacuum state of MPa; b. the smelting temperature is 1620 ℃; c. the smelting process adopts magnetic stirring; d. the smelting time is 170s (according to the formula t=K×(M -1 / 2 ) to obtain, where the element coefficient K is 6s g -1 / 2 , M is 800g);

[0036] S3. Magnetic field heat treatment: The alloy ingot obtained by the above vacuum smelting is subjected to vacuum magnetic field heat treatment, the treatment conditions are: temperature 670°C; time: 14 hours; vacuum degree: 2×10 -3 MPa; Applied magnetic field strength: 5×10 6 A·m -1 ; Magnetic field rise rate: 800A·m -1 ·s -1 ;

[0037] S4. Cooling; then ...

Embodiment 3

[0040] Prepare 700g composition as Co 33.4 Ni 33.4 al 32.4 PR 0.8 The low fatigue magnetic memory alloy, its preparation method is as follows:

[0041] S1. Ingredients: Weigh Co, Ni, Al, and Pr with a purity of 99.99% respectively;

[0042] S2. Melting: Put the prepared raw materials in a crucible for vacuum melting, and the melting conditions are: a.3×10 -3 The low vacuum state of MPa; b. the smelting temperature is 1640 ℃; c. the smelting process adopts magnetic stirring; d. the smelting time is 185s (according to the formula t=K×(M -1 / 2 ) to obtain, where the element coefficient K is 7s g -1 / 2 , M is 700g);

[0043] S3. Magnetic field heat treatment: The alloy ingot obtained by the above vacuum smelting is subjected to vacuum magnetic field heat treatment, the treatment conditions are: temperature 680°C; time: 13 hours; vacuum degree: 3×10 -3 MPa; Applied magnetic field strength: 1×10 7 A·m -1 ; Magnetic field rise rate: 800A·m -1 ·s -1 ;

[0044] S4. Cooling; t...

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Abstract

The invention provides a low start threshold magnetic memory alloy and a preparation method thereof. Compared with existing materials, the low start threshold magnetic memory alloy has the advantagesof excellent mechanical properties and magnetoelastic strain low start threshold. The chemical formula of the alloy is Co<x>Al<y>Ni<z>Pr<j>, wherein x is greater than or equal to 32.8 and is less thanor equal to 39.7, y is greater than or equal to 32.5 and is less than or equal to 37.6, z is greater than or equal to 28.3 and is less than or equal to 32.4, j is greater than or equal to 0.6 and isless than or equal to 1.2, x plus y plus z and plus j is equal to 100, and x, y, z and j represent molar percentage content. Compared with the existing materials, the magnetically controlled shape memory alloy forms a Co19Pr5 intermetallic compound with a coherent ultrafine dispersion distribution in a matrix phase of the alloy, so that the alloy has both the characteristics of good mechanical properties and magnetic properties, and the alloy is promoted to have the characteristics of both excellent mechanical properties and low start threshold, and the industrial application range of the typeof alloy is greatly broadened.

Description

technical field [0001] The invention belongs to the field of shape memory alloys, in particular to a magnetic memory alloy with a low start-up threshold and a preparation method thereof. Background technique [0002] Ferromagnetic shape memory alloy is a new type of shape memory alloy developed in the 1990s. This new type of alloy has thermoelastic martensitic transformation and ferromagnetic transformation at the same time, and its shape memory effect can be carried out under the control of a magnetic field, and its magnetic strain will not be affected by the thermal conductivity and heat dissipation conditions of the alloy. Compared with traditional temperature-controlled shape memory alloys, ferromagnetic shape memory alloys have the advantages of large strain and high response frequency. Therefore, ferromagnetic shape memory alloys have great potential to become the first choice for next-generation smart materials, and are widely used in high-tech fields such as mechani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/00C21D1/04C21D1/773
CPCC21D1/04C21D1/773C22C1/02C22C1/023C22C19/058C22C19/07C22C30/00C22C2202/02C22F1/00C22F1/10
Inventor 巨佳刘壮康彦李玉平张思斌许永祥张慧李华冠巴志新吕学鹏
Owner NANJING INST OF TECH
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