Magnetic memory alloy with in-situ precipitation and co-lattice precipitation phase and preparation method thereof

A technology of memory alloy and precipitated phase, which is applied in the field of shape memory alloy, can solve the problems of magnetic shape memory alloy magnetic strain function fatigue, functional failure, hindering the application and promotion of driving, etc., and achieve large magnetic strain, excellent magnetic performance, The effect of broadening the range of industrial applications

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

AI Technical Summary

Problems solved by technology

However, the functional failure of this type of drive will occur after repeated use. The reason is caused by the fatigue of the magnetic strain function of the magnetic shape memory alloy, which seriously hinders the application and application of this type of drive in the industrial field. to promote

Method used

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  • Magnetic memory alloy with in-situ precipitation and co-lattice precipitation phase and preparation method thereof
  • Magnetic memory alloy with in-situ precipitation and co-lattice precipitation phase and preparation method thereof
  • Magnetic memory alloy with in-situ precipitation and co-lattice precipitation phase and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepare 400g composition as Co 39.9 Ni 29.6 al 29.6 T m 0.9 The low fatigue magnetic memory alloy, its preparation method is as follows:

[0027] S1. Ingredients: Weigh Co, Ni, Al, Tm 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. melting temperature is 1450 ℃; c. melting process adopts magnetic stirring; d. melting time 400s (according to formula t=K×(M -1 / 2 ) to obtain, where the element coefficient K is 20s·g -1 / 2 , M is 400g);

[0029] S3. Magnetic field heat treatment: The alloy ingot obtained by the above-mentioned vacuum smelting is subjected to vacuum magnetic field heat treatment, and the treatment conditions are: temperature 600°C; time: 15 hours; vacuum degree: 1×10 -3 MPa; Applied magnetic field strength: 2×10 6 A·m -1 ; Magnetic field rise rate: 1200A m -1 ·s -1 ;

[0030] S4. Cooling; then cooling w...

Embodiment 2

[0033] Prepare 500g composition as Co 37.0 Ni 31.3 Al 30.7 T m 1.0 The low fatigue magnetic memory alloy, its preparation method is as follows:

[0034] S1. Ingredients: Weigh Co, Ni, Al, Tm 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 1470 ℃; c. the smelting process adopts magnetic stirring; d. the smelting time is 425s (according to the formula t=K×(M -1 / 2 ) to obtain, where the element coefficient K is 19s g -1 / 2 , M is 500g);

[0036] S3. Magnetic field heat treatment: The alloy ingot obtained by the above-mentioned vacuum smelting is subjected to vacuum magnetic field heat treatment, and the treatment conditions are: temperature 610°C; time: 14 hours; vacuum degree: 2×10 -3 MPa; Applied magnetic field strength: 5×10 6 A·m -1 ; Magnetic field rise rate: 1200A m -1 ·s -1 ;

[0037] S4. C...

Embodiment 3

[0040] Prepare 600g composition as Co 38.3 Ni 30.0 Al 30.5 T m 1.2 The low fatigue magnetic memory alloy, its preparation method is as follows:

[0041] S1. Ingredients: Weigh Co, Ni, Al, Tm 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 1490 ℃; c. the smelting process adopts magnetic stirring; d. the smelting time is 441s (according to the formula t=K×(M -1 / 2 ) to obtain, where the element coefficient K is 18s g -1 / 2 , M is 600g);

[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 620°C; time: 13 hours; vacuum degree: 3×10 -3 MPa; Applied magnetic field strength: 7×10 6 A·m -1 ; Magnetic field rise rate: 1200A m -1 ·s -1 ;

[0044] S4. Cooling; th...

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Abstract

The invention provides a magnetic memory alloy with in-situ precipitation and co-lattice precipitation phase and a preparation method thereof, and belongs to the field of shape memory alloys. Comparedwith the existing material, the alloy has the advantages of excellent mechanical property and excellent magnetic property. The chemical formula of the magnetic memory alloy is CoxNiyAlzTmj, wherein xis larger than or equal to 35.1 and smaller than or equal to 39.9, y is larger than or equal to 29.6 and smaller than or equal to 32.7, z is larger than or equal to 28.5 and smaller than or equal to31.8, j is larger than or equal to 0.9 and smaller than or equal to 1.8, the sum of x, y, z and j is equal to 100, and x, y, z and j represent mole percent contents. Compared with an existing material, the micron-level short rod-shaped Co5Tm metal intermediate phase formed in the matrix phase of the alloy enables the alloy to have good mechanical and magnetic properties, the alloy can achieve thecharacteristics of excellent mechanical property and magnetic property, and the industrial application range of the alloy is greatly widened.

Description

technical field [0001] The invention belongs to the field of shape memory alloys, in particular to a magnetic memory alloy with in-situ precipitation of a coherent precipitation phase and a preparation method thereof Background technique [0002] Magnetic shape memory alloy is a new type of shape memory alloy developed in the 1990s. This type of shape memory alloy has the characteristics of thermoelastic martensitic transformation and ferromagnetic transformation at the same time, and can realize the control of its deformation by a magnetic field. Traditional temperature-controlled shape memory alloys, such as NiTi-based and Fe-based alloys, have large strains, but the response is too slow, while shape memory alloys such as giant magnetostrictive materials and piezoelectric materials have high response frequencies and strain But very small. As a new shape memory alloy, magnetic shape memory alloy has the characteristics of large strain and fast response, and this type of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C19/07C22C1/02C22F1/10C22F1/02C21D1/04
CPCC21D1/04C22C1/02C22C19/07C22C30/00C22F1/02C22F1/10
Inventor 巨佳刘壮康彦张思斌巴志新毛向阳张保森许永祥张慧
Owner NANJING INST OF TECH
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