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Rare earth magnetic material with controllable deformation of magnetic field and preparation method thereof

A magnetic material, rare earth technology, applied in the field of rare earth magnetic materials, can solve the problems of reducing the magnetism of alloys, hindering the magnetic control deformation of alloys, etc., and achieve the effect of improving magnetic properties, good mechanical properties, and large magnetically induced strain

Active Publication Date: 2015-10-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the precipitation of the second phase with good mechanical properties in the alloy structure improves the mechanical properties of the alloy, but because the second phase exhibits weak magnetism or antiferromagnetism, it reduces the magnetism of the alloy and hinders the magneto-controlled deformation of the alloy.

Method used

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  • Rare earth magnetic material with controllable deformation of magnetic field and preparation method thereof
  • Rare earth magnetic material with controllable deformation of magnetic field and preparation method thereof
  • Rare earth magnetic material with controllable deformation of magnetic field and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The composition of the preparation is Co 42 Ni 32 al 25.5 Dy 0.5 The rare earth magnetic material with magnetic field controllable deformation, its preparation method is as follows:

[0026] (1) Weigh respectively Co, Ni, Al, Dy with a purity of 99.9%;

[0027] (2) Put the weighed raw materials in the crucible, and use vacuum melting. The melting conditions are: a.1×10 -3 b. The melting temperature is 1300°C; c. The melting process uses magnetic stirring; d. The melting time is 0.5 hours.

[0028] (3) Rapidly solidify the alloy ingot obtained by the above-mentioned vacuum smelting, the solidification condition is: temperature 550-1200°C; time: 0.5-100 hours; vacuum degree: 1×10 -2 ~1×10 -3 MPa;

[0029] (4) Carry out vacuum annealing treatment to the above-mentioned solidified alloy rods, the treatment conditions are: temperature 550°C; time: 100 hours; vacuum degree: 1×10 -2 MPa. Then cool down to room temperature with the furnace.

[0030] The polycrystallin...

Embodiment 2

[0032] The composition of the preparation is Co 40 Ni 30 al 23 Dy 7 A magnetic alloy with magnetic field-driven twin martensitic deformation, the preparation method of which is as follows:

[0033] (1) Weigh respectively Co, Ni, Al, Dy with a purity of 99.9%;

[0034] (2) Put the weighed raw materials in the crucible, and use vacuum melting. The melting conditions are: a.1×10 -4 b. The melting temperature is 1400°C; c. The melting process uses magnetic stirring; d. The melting time is 1.5 hours.

[0035] (3) Rapidly solidify the alloy ingot obtained by the above-mentioned vacuum smelting, the solidification condition is: temperature 550~1200°C; time: 0.5~100 hours; vacuum degree: 1×10 -2 ~1×10 -3 MPa;

[0036] (4) Carry out vacuum annealing treatment to the above-mentioned smelted alloy ingot, the treatment conditions are: temperature 800°C; time: 70 hours; vacuum degree: 5×10 -3 MPa. Then cool down to room temperature with the furnace.

[0037] The polycrystalline sam...

Embodiment 3

[0039] The composition of the preparation is Co 28 Ni 25 al 37 Dy 10 A magnetic alloy with magnetic field-driven twin martensitic deformation, the preparation method of which is as follows:

[0040] (1) Weigh respectively Co, Ni, Al, Dy with a purity of 99.9%;

[0041] (2) Put the weighed raw materials in the crucible, and use vacuum melting. The melting conditions are: a.1×10 -5 b. The melting temperature is 1500°C; c. The melting process uses magnetic stirring; d. The melting time is 2 hours.

[0042] (3) Rapidly solidify the alloy ingot obtained by the above-mentioned vacuum smelting, the solidification condition is: temperature 550-1200°C; time: 0.5-100 hours; vacuum degree: 1×10 -2 ~1×10 -3 MPa;

[0043] (4) Carry out vacuum annealing treatment to the above-mentioned smelted alloy ingot, the treatment conditions are: temperature 1000 ℃; time: 24 hours; vacuum degree: 1×10 -3 MPa. Then cool down to room temperature with the furnace.

[0044] The polycrystalline s...

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Abstract

The invention provides a rare earth magnetic material with controlled deformation of a magnetic field and a preparation method thereof. The material has the capability of generating micro-deformation controlled by an outer magnetic field at a room temperature and a temperature higher than the room temperature and is a novel rare earth magnetic control shape memory alloy capable of driving twin boundary migration of martensite by change of the external magnetic field to generate stress at a room temperature and a temperature higher than the room temperature. The chemical formula of the alloy is CoxNiyAlzDyj, wherein x is greater than or equal to 28 but less than or equal to 42, y is greater than or equal to 25 but less than or equal to 32, z is greater than or equal to 23 but less than or equal to 37, j is greater than or equal to 0.5 but less than or equal to 10, x+y+z+j=100, and x, y, z and j represent molar percentage contents. Compared with existing materials, the rare earth magnetic material has a wide magnetoelastic strain temperature range, great magnetoelastic strain and good mechanical property, and has important application in the fields such as micro-actuators, vibration and noise control, linear motors, microwave apparatuses and robots which can be used in temperatures higher than room temperature.

Description

technical field [0001] The invention belongs to the field of shape memory materials, and relates to a rare earth magnetic material with controllable deformation of a magnetic field. Background technique [0002] Traditional shape memory alloys undergo martensitic phase transformation and reverse phase transformation under the action of temperature or stress, thereby producing a macroscopic shape memory effect. However, due to the low response frequency and complex auxiliary equipment driven by temperature or stress, its application is limited. [0003] In this context, with Ni 2 Ferromagnetic shape memory alloys represented by MnGa have attracted the attention of scholars at home and abroad. Magnetically controlled shape memory alloy is a new type of intelligent 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 magnetic shape memory effect controlled by the magnetic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/00H01F1/053
Inventor 薛烽巨佳周健白晶孙扬善厉虹
Owner SOUTHEAST UNIV
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