A kind of highly anisotropic magnetic memory alloy and its preparation method

A technology of memory alloy and anisotropy, which is applied in the field of shape memory alloy, can solve the problem of low magnetic domain anisotropy, achieve the effect of strengthening magnetocrystalline anisotropy, excellent mechanical properties, and improving deformation driving force

Active Publication Date: 2020-06-12
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the magnetic domain anisotropy on the martensitic structure of the currently developed magnetic shape memory alloy is still relatively low, which cannot provide a greater deformation driving force under the action of an external magnetic field.

Method used

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  • A kind of highly anisotropic magnetic memory alloy and its preparation method
  • A kind of highly anisotropic magnetic memory alloy and its preparation method
  • A kind of highly anisotropic magnetic memory alloy and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Prepare 900g composition as Ni 39.7 co 31.6 al 28.2 Lu 0.5 The magnetic memory alloy with high anisotropy, its preparation method is as follows:

[0026] S1. Ingredients: Weigh Ni, Co, Al, Lu with a purity of 99.99% respectively;

[0027] 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 1550 ℃; c. the smelting process adopts magnetic stirring; d. the smelting time is 270s (according to the formula t=K×(M -1 / 2 ) to obtain, where the element coefficient K is 9s g -1 / 2 , M is 900g);

[0028] S3. Magnetic field heat treatment: The alloy ingot obtained by the above vacuum melting is subjected to vacuum magnetic field heat treatment, and the treatment conditions are: temperature 720°C; time: 12 hours; vacuum degree: 1×10 -3 MPa; Applied magnetic field strength: 1×10 6 A·m -1 ; Magnetic field rise rate: 400A·m -1 ·s -1 ;

[0029] S4. Coolin...

Embodiment 2

[0032] Prepare 800g composition as Ni 36.8 co 28.5 Al 34.2 Lu 0.5 The magnetic memory alloy with high anisotropy, its preparation method is as follows:

[0033] S1. Ingredients: Weigh Ni, Co, Al, Lu with a purity of 99.99% respectively;

[0034] 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 1580 ℃; c. the smelting process adopts magnetic stirring; d. the smelting time is 226s (according to the formula t=K×(M -1 / 2 ) to obtain, where the element coefficient K is 8s·g -1 / 2 , M is 800g);

[0035] 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 730°C; time: 11 hours; vacuum degree: 2×10 -3 MPa; Applied magnetic field strength: 3×10 6 A·m -1 ; Magnetic field rise rate: 400A·m -1 ·s -1 ;

[0036] S4. Cooling: ...

Embodiment 3

[0039] Prepare 700g composition as Ni 39.5 co 31.3 Al 27.4 Lu 1.8 The magnetic memory alloy with high anisotropy, its preparation method is as follows:

[0040] S1. Ingredients: Weigh Ni, Co, Al, Lu with a purity of 99.99% respectively;

[0041] 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. melting temperature is 1590 ℃; c. melting process adopts magnetic stirring; d. melting time is 185s (according to formula t=K×(M -1 / 2 ) to obtain, where the element coefficient K is 7s g -1 / 2 , M is 700g);

[0042] 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 740°C; time: 10 hours; vacuum degree: 3×10 -3 MPa; Applied magnetic field strength: 5×10 6 A·m -1 ; Magnetic field rise rate: 400A·m -1 ·s -1 ;

[0043] S4. Cooling: f...

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Abstract

The invention provides high-anisotropy magnetic memory alloy and a preparation method thereof, and belongs to the field of shape memory alloy. The alloy has the good mechanical property and the high magnetocrystalline anisotropy and is the high-anisotropy magnetic memory alloy which can generate recoverable strain by driving martensite for twin crystal boundary migration and reverse migration through external magnetic field change. The chemical formula of the alloy is Ni<x>Co<y>Al<z>Lu<j>, wherein x is larger than or equal to 38.6 and smaller than or equal to 39.7, y is larger than or equal to28.5 and smaller than or equal to 31.6, z is larger than or equal to 27.4 and smaller than or equal to 34.2, j is larger than or equal to 0.5 and smaller than or equal to 7, x+y+z+j=100, and x, y, zand j serve as the molar percentage content. Compared with existing materials, the second phase of the magnetic memory alloy has the micron Lu2Ni17 metal intermediate phase, thus, the magnetic memoryalloy has the good mechanical property and the high magnetocrystalline anisotropy and can be well applied to the fields of high-precision drivers capable of being used at the room temperature, actuators and the like.

Description

technical field [0001] The invention belongs to the field of shape memory alloys, in particular to a highly anisotropic magnetic memory alloy and a preparation method thereof. Background technique [0002] Smart material is a new type of functional material, which can perceive external stimuli and make corresponding external executive responses to stimuli, connecting a series of actions such as perception, signal processing, driving, and external output strain. At present, materials with this kind of perception-actuation mainly include piezoelectric materials driven by electric field, memory alloys driven by magnetic field, and memory alloys driven by temperature field. [0003] Magnetic field-driven memory alloys have a shape memory effect of magnetic field-driven deformation. The shape memory effect comes from the martensitic phase transformation of the austenite phase under the action of an external magnetic field or the rearrangement of martensite twins under the action ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/02
CPCC22C1/02C22C19/03C22C30/00C22C2202/02C22F1/02C22F1/10
Inventor 刘欢巨佳刘壮张思斌许永祥张慧王策黄河
Owner HOHAI UNIV
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