Magnetic material with magnetic field for driving martensite twin crystal rearrangement and preparation method thereof

A magnetic material and magnetic field-driven technology, applied in the field of magnetically controlled shape memory materials, can solve the problems of insufficient mechanical properties of materials and difficulties in industrial promotion, and achieve the goal of improving magnetic and mechanical properties, large magnetically induced strain, and improving polycrystalline brittleness Effect

Active Publication Date: 2014-07-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pure martensitic structure will lead to insufficient mechanical p

Method used

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  • Magnetic material with magnetic field for driving martensite twin crystal rearrangement and preparation method thereof
  • Magnetic material with magnetic field for driving martensite twin crystal rearrangement and preparation method thereof
  • Magnetic material with magnetic field for driving martensite twin crystal rearrangement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The composition of the preparation is Co 42 Ni 32 al 25.5 Ga 0.5 A magnetic alloy with magnetic field-driven twin martensitic deformation, the preparation method of which is as follows:

[0024] (1) Weighing Co, Ni, Al, Ga with a purity of 99.9% respectively;

[0025] (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.

[0026] (3) Carry out vacuum annealing treatment to the above-mentioned smelted alloy ingot, the treatment conditions are: temperature 550 ℃; time: 100 hours; vacuum degree: 1×10 -2 MPa. Then cool down to room temperature with the furnace.

[0027] The polycrystalline sample prepared by the above method was cut into 5×5×8 mm samples by wire cutting to detect various characteristic curves.

Embodiment 2

[0029] The composition of the preparation is Co 40 Ni 30 al 23 Ga 7 A magnetic alloy with magnetic field-driven twin martensitic deformation, the preparation method of which is as follows:

[0030] (1) Weighing Co, Ni, Al, Ga with a purity of 99.9% respectively;

[0031] (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.

[0032] (3) 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 -2 MPa. Then cool down to room temperature with the furnace.

[0033] The polycrystalline sample prepared by the above method was cut into 5×5×8 mm samples by wire cutting to detect various characteristic curves.

Embodiment 3

[0035] The composition of the preparation is Co 28 Ni 30 al 32 Ga 10 A magnetic alloy with magnetic field-driven twin martensitic deformation, the preparation method of which is as follows:

[0036] (1) Weighing Co, Ni, Al, Ga with a purity of 99.9% respectively;

[0037] (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.

[0038] (3) 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.

[0039] The polycrystalline sample prepared by the above method was cut into 5×5×8 mm samples by wire cutting to detect various characteristic curves.

[0040]

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Abstract

The invention discloses a magnetic material with a magnetic field for driving martensite twin crystal rearrangement and a preparation method thereof. The material has ferromagnetism and a two-way shape memory effect, and is a novel magnetically controlled shape memory alloy capable of driving martensite twin crystal rearrangement to generate macro-strain by an outer magnetic field, wherein the chemical component is CoxNiyAlzGaj, x is less than or equal to 42 and greater than or equal to 28; y is less than or equal to 32 and greater than or equal to 25, z is less than or equal to 35 and greater than or equal to 23, j is less than or equal to 10 and greater than or equal to 0.5, x+y+z+j =100, and x, y, z and j represent the molar percentage content. Compared with the existing alloy, the magnetically controlled shape memory alloy CoxNiyAlzGaj disclosed by the invention has large magnetic strain, a wide martensite phase transformation temperature range and good mechanical property, and has important application to the field such as a high-power underwater sonar, a micro positioner, vibration and noise control, a linear motor, a microwave device, a robot and the like.

Description

technical field [0001] The invention belongs to the field of magnetically controlled shape memory materials, and relates to a magnetically controlled shape memory alloy that can be driven by an external magnetic field to rearrange martensitic twins to generate macroscopic strain and a preparation method thereof. Background technique [0002] Magnetically controlled shape memory alloy is a new type of shape memory material, which 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 field. Therefore, the alloy has the comprehensive characteristics of large recovery strain, large output stress, high response frequency and precise control of deformation through slight changes in the external magnetic field. At present, the maximum magnetic strain of the magnetically controlled shape memory alloy is about 10%, and the highest response freq...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22F1/02
Inventor 薛烽巨佳周健白晶孙扬善历虹孙晶晶严木香
Owner SOUTHEAST UNIV
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