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Memory alloy driven by magnetic field to deform and preparation method thereof

A memory alloy and magnetic field-driven technology, applied in the field of shape memory alloys, can solve the problems that alloys cannot be processed into parts, hinder the promotion and application of alloys, and do not meet engineering applications, and achieve improved magnetic properties, excellent mechanical properties and magnetic properties. The effect of a wide magnetostrictive temperature range

Active Publication Date: 2018-05-29
HANGZHOU KAIERDA ELECTRIC WELDING MACHINE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently, the most studied is the Ni 2 MnGa alloy, but most of the alloys are relatively brittle, and the phase transition temperature is relatively low, especially its extreme brittleness makes the alloy unable to be processed into parts, which does not meet the requirements of engineering applications, which greatly hinders the promotion and application of this type of alloy

Method used

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  • Memory alloy driven by magnetic field to deform and preparation method thereof
  • Memory alloy driven by magnetic field to deform and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation composition is Ni 36 mn 11 Ga 7 Fe 46 The shape memory alloy with magnetic field controllable deformation, its preparation method is as follows:

[0023] (1) Weigh Ni, Mn, Ga, Fe with a purity of 99.9% respectively for batching;

[0024] (2) Put the weighed raw materials in the crucible, and use vacuum melting, and the melting conditions are: a.1×10 -3 MPa vacuum state; b. The melting temperature is 1500°C; c. The melting process uses magnetic stirring; d. The melting time is 0.5 hours.

[0025] (3) Conduct magnetic field heat treatment on the above smelted alloy ingot, the treatment conditions are: temperature 800°C; time: 8 hours; applied magnetic field strength: 1×0 5 A·m -1 ; Magnetic field rise rate: 1500A m -1 ·s -1 .

[0026] (4) Then take out the sample for rapid cooling, the cooling rate is: 100°C / s, and the final shape memory alloy can be obtained after cooling to room temperature.

[0027] The polycrystalline sample prepared by the a...

Embodiment 2

[0029] The preparation composition is Ni 41 mn 15 Ga 8 Fe 36 The shape memory alloy with magnetic field controllable deformation, its preparation method is as follows:

[0030] (1) Weigh Ni, Mn, Ga, Fe with a purity of 99.9% respectively for batching;

[0031](2) Put the weighed raw materials in the crucible, and use vacuum melting, and the melting conditions are: a.2×10 -3 MPa vacuum state; b. The melting temperature is 1480°C; c. The melting process uses magnetic stirring; d. The melting time is 0.7 hours.

[0032] (3) Conduct magnetic field heat treatment on the above smelted alloy ingot, the treatment conditions are: temperature 820°C; time: 7 hours; applied magnetic field strength: 3×0 5 A·m -1 ; Magnetic field rise rate: 1400A m -1 ·s -1 .

[0033] (4) Then take out the sample for rapid cooling, the cooling rate is: 200°C / s, and the final shape memory alloy can be obtained after cooling to room temperature.

[0034] The polycrystalline sample prepared by the ab...

Embodiment 3

[0036] The preparation composition is Ni 44 mn 13 Ga 9 Fe 34 The shape memory alloy with magnetic field controllable deformation, its preparation method is as follows:

[0037] (1) Weigh Ni, Mn, Ga, Fe with a purity of 99.9% respectively for batching;

[0038] (2) Put the weighed raw materials in the crucible, and use vacuum melting, and the melting conditions are: a.3×10 -3 MPa vacuum state; b. The melting temperature is 1450°C; c. The melting process uses magnetic stirring; d. The melting time is 0.9 hours.

[0039] (3) The above smelted alloy ingot is subjected to magnetic field heat treatment, the treatment conditions are: temperature 840°C; time: 7.5 hours; applied magnetic field strength: 5×0 5 A·m -1 ; Magnetic field rise rate: 1350A m -1 ·s -1 .

[0040] (4) Then take out the sample for rapid cooling, the cooling rate is: 400°C / s, and the final shape memory alloy can be obtained after cooling to room temperature.

[0041] The polycrystalline sample prepared b...

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Abstract

The invention provides a memory alloy driven by a magnetic field to deform and a preparation method thereof and belongs to the field of shape memory alloys. The alloy has the capacity of being controlled by the external magnetic field to deform at room temperature, and is a magnetic control shape memory alloy capable of generating restorable deformation in the manner that martensite twin boundaries are driven by the change of the external magnetic field to migrate and reversely migrate at room temperature. The chemical formula of the alloy is NixMnyGazFej, wherein x is larger than or equal to36 and smaller than or equal to 52, y is larger than or equal to 11 and smaller than or equal to 22, z is larger than or equal to 7 and smaller than or equal to 12, j is larger than or equal to 33 andsmaller than or equal to 48, x+y+z+j is equal to 100, and x, y, z and j show mole percent contents. Compared with existing materials, a Fe-Ga intermetallic compound exists in the microstructure of the magnetic control shape memory alloy, and the alloy has the wide magnetoelastic strain temperature range, the high magnetoelastic strain amount and the good mechanical performance, and can be importantly applied to the fields such as high-precision drivers and actuators used at room temperature.

Description

technical field [0001] The invention belongs to the field of shape memory alloys, in particular to a magnetic field driven deformation memory alloy and a preparation method thereof. Background technique [0002] Shape memory alloy is a new type of smart material with both "sensing" and "driving" characteristics. The principle of its "memory" is: the alloy deformed by external force restores its original shape through external factors (temperature or magnetic field, etc.), resulting in a shape memory effect. Because shape memory alloys have the advantages of generating large stress and strain, they are widely used in aerospace, medical, machinery, power and other fields. However, traditional shape memory alloys are driven by temperature, the shape recovery response is slow, and the response frequency is low. At the same time, cooling is often slower than heating and is accompanied by a large amount of heat loss. [0003] Magnetically controlled shape memory alloy is a new t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C22/00C22C1/02C22F1/16
CPCC22C1/02C22C22/00C22C30/00C22F1/006C22F1/16
Inventor 巨佳侯润石吴勇健刘德荣
Owner HANGZHOU KAIERDA ELECTRIC WELDING MACHINE
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