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Magnetic memory alloy with long function life and preparation method thereof

A memory alloy and high-function technology, applied in the field of shape memory alloys, can solve problems such as hindering the application and promotion of actuators, magneto-strain function decline, actuator function decline, etc., to broaden the scope of industrial applications, excellent mechanical properties, The effect of high functional life

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

[0003] At present, actuators in industrial applications need to face high frequency and number of uses. After multiple high-frequency cyclic strains, the magnetic strain function of the ferromagnetic shape memory alloy, which is the key material of actuators, gradually declines, resulting in The functional decline or even failure of the actuator has greatly hindered the industrial application and promotion of the actuator with this type of material as the core component.

Method used

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  • Magnetic memory alloy with long function life and preparation method thereof
  • Magnetic memory alloy with long function life and preparation method thereof
  • Magnetic memory alloy with long function life and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepare 900g composition as Co 35.6 Ni 33.2 al 30.4 Nd 0.8 The low fatigue magnetic memory alloy, its preparation method is as follows:

[0027] S1. Ingredients: Weigh Co, Ni, Al, Nd 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.5×10 -2 The low vacuum state of MPa; b. the smelting temperature is 1550 ℃; c. the smelting process adopts magnetic stirring; d. the smelting time is 330s (according to the formula t=K×(M -1 / 2 ) to obtain, where the element coefficient K is 11s g -1 / 2 , M is 900g);

[0029] 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 630°C; time: 15 hours; vacuum degree: 5×10 -2 MPa; Applied magnetic field strength: 1×10 5 A·m-1 ; Magnetic field rise rate: 600A·m -1 ·s -1 ;

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

Embodiment 2

[0033] Prepare 800g composition as Co 39.8 Ni 30.1 Al 29.2 Nd 0.9 The low fatigue magnetic memory alloy, its preparation method is as follows:

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

[0035] S2. Melting: Put the prepared raw materials in a crucible for vacuum melting, and the melting conditions are: a.6×10 -2 The low vacuum state of MPa; b. the smelting temperature is 1570 ℃; c. the smelting process adopts magnetic stirring; d. the smelting time is 339s (according to the formula t=K×(M -1 / 2 ) to obtain, where the element coefficient K is 12s g -1 / 2 , M is 800g);

[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 640°C; time: 14 hours; vacuum degree: 6×10 -2 MPa; Applied magnetic field strength: 5×10 5 A·m -1 ; Magnetic field rise rate: 600A·m -1 ·s -1 ;

[0037] S4....

Embodiment 3

[0040] Prepare 700g composition as Co 31.9 Ni 31.3 Al 35.7 Nd 1.1 The low fatigue magnetic memory alloy, its preparation method is as follows:

[0041] S1. Ingredients: Weigh Co, Ni, Al, Nd 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.7×10 -2 The low vacuum state of MPa; b. the smelting temperature is 1580 ℃; c. the smelting process adopts magnetic stirring; d. the smelting time is 344s (according to the formula t=K×(M -1 / 2 ) to obtain, where the element coefficient K is 13s g -1 / 2 , M is 700g);

[0043] 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 650°C; time: 13 hours; vacuum degree: 7×10 -2 MPa; Applied magnetic field strength: 1×10 6 A·m -1 ; Magnetic field rise rate: 600A·m -1 ·s -1 ;

[0044] S4....

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Abstract

The invention provides a magnetic memory alloy with long function life and a preparation method thereof and belongs to the field of shape memory alloys. Compared with other magnetic shape memory alloys, the magnetic memory alloy has the two advantages of the two aspects of good mechanical properties and long function life. The chemical formula of the magnetic memory alloy is CoxNiyAlzNdj, wherein31.9 <= x <= 39.8, 30.1 <= y<= 34.6, 29.2 <= z <= 35.7, 0.8 <= j <= 1.5, x+y+z+j = 100, and x, y, z and j represent mole percentages. Compared with existing materials, the magnetic shape memory alloyhas the advantages that the coherent superfine Co7Nd2 intermetallic compound is formed around the second phase of the memory alloy, magnetic performance and function fatigue resistance of the magneticmemory alloy are improved greatly while mechanical properties of the second phase are enhanced, thus the magnetic memory alloy has both good mechanical properties and the long function life, and theindustrial application range of the magnetic memory alloy is widened greatly.

Description

technical field [0001] The invention belongs to the field of shape memory alloys, in particular to a magnetic memory alloy with high functional life and a preparation method thereof. Background technique [0002] Now the society is developing rapidly at an unprecedented speed, and in the process of development, it strongly depends on the material, information and energy industries. Materials play a pivotal role in this. Smart materials are a new field of rapidly developing materials technology in the world. The most widely used smart materials are piezoelectric materials, magnetostrictive materials and shape memory alloys. Recently, many new materials with multiple functions have been discovered, such as ferromagnetic electro-magnetic materials, ferroelectric shape memory alloys, ferromagnetic shape memory alloys. Among them, ferromagnetic shape memory alloy has both high response frequency and large magnetic strain, and has become one of the ideal materials for industria...

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
CPCC21D1/04C21D1/773C22C1/02C22C19/07C22C30/00C22C2202/02C22F1/00C22F1/10
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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