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A low starting critical stress rare earth magnetically controlled shape memory alloy and its preparation method

A memory alloy and critical stress technology, applied in the field of shape memory materials, can solve the problems of difficult to meet engineering applications, limited wide-scale promotion, low phase transition temperature, etc. Mechanical properties, the effect of improving magnetic properties

Active Publication Date: 2017-06-20
来安县永阳知识产权运营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the most researched and most widely used is Ni 2 MnGa alloys, but most of these alloys are relatively brittle, and the phase transition temperature is relatively low, which is difficult to meet the needs of engineering applications, which limits their wide-scale promotion in engineering applications.

Method used

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  • A low starting critical stress rare earth magnetically controlled shape memory alloy and its preparation method
  • A low starting critical stress rare earth magnetically controlled shape memory alloy and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The composition of the preparation is Co 43 Ni 30 Al 26 Ce's shape memory alloy with magnetic field controllable deformation, its preparation method is as follows:

[0028] (1) Weighing Co, Ni, Al, Ce with a purity of 99.9% respectively;

[0029] (2) Put the weighed raw materials in the crucible, and use vacuum melting. The melting conditions are: a.1×10 -2MPa vacuum state; b. The melting temperature is 1350°C; c. The melting process uses magnetic stirring; d. The melting time is 0.5 hours.

[0030] (3) Carry out vacuum magnetic field heat treatment to the above-mentioned smelted alloy ingot, the treatment conditions are: temperature 550°C; time: 24 hours; vacuum degree: 1×10 -3 Mpa; Applied magnetic field strength: 1×10 6 A·m -1 .

[0031] (4) Then cool with the furnace, the cooling rate range is: 0.01°C / s; the magnetic field reduction rate is: 1500A m -1 ·s -1 ; Cool to room temperature and take out to obtain the final shape memory alloy.

[0032] The polycr...

Embodiment 2

[0034] The composition of the preparation is Co 30 Ni 34 al 31 Ce 5 The shape memory alloy with magnetic field controllable deformation, its preparation method is as follows:

[0035] (1) Weighing Co, Ni, Al, Ce with a purity of 99.9% respectively;

[0036] (2) Put the weighed raw materials in the crucible, and use vacuum melting, the melting conditions are: a.7×10 -3 MPa vacuum state; b. The melting temperature is 1400°C; c. The melting process uses magnetic stirring; d. The melting time is 0.4 hours.

[0037] (3) Carry out vacuum magnetic field heat treatment to the above-mentioned smelted alloy ingot, the treatment conditions are: temperature 500°C; time: 32 hours; vacuum degree: 6×10 -3 Mpa; Applied magnetic field strength: 1×10 7 A·m -1 .

[0038] (4) Then cool with the furnace, the cooling rate range is: 0.3°C / s; the magnetic field reduction rate is: 5000A m -1 ·s -1 ; Cool to room temperature and take out to obtain the final shape memory alloy.

[0039] The p...

Embodiment 3

[0041] The composition of the preparation is Co 18 Ni 27 al 40 Ce 15 The shape memory alloy with magnetic field controllable deformation, its preparation method is as follows:

[0042] (1) Weighing Co, Ni, Al, Ce with a purity of 99.9% respectively;

[0043] (2) Put the weighed raw materials in the crucible, and use vacuum melting. The melting conditions are: a.1×10 -3 MPa vacuum state; b. The melting temperature is 1450°C; c. The melting process uses magnetic stirring; d. The melting time is 0.3 hours.

[0044] (3) Carry out vacuum magnetic field heat treatment to the above-mentioned smelted alloy ingot, the treatment conditions are: temperature 450 ℃; time: 48 hours; vacuum degree: 1×10 -3 Mpa; Applied magnetic field strength: 3×10 7 A·m -1 .

[0045] (4) Then cool with the furnace, the cooling rate range is: 1°C / s; the magnetic field reduction rate is: 8000A m -1 ·s -1 ; Cool to room temperature and take out to obtain the final shape memory alloy.

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Abstract

The invention provides a rare earth magnetic-control shape memory alloy low in starting critical stress and a preparation method thereof and belongs to the field of memory alloy materials. The material has the capacity to generate deformation under the control of a weak external magnetic field under the indoor temperature condition and is novel rare earth magnetic-control shape memory alloy according to which strain can be generated due to martensite twin boundary migration under the driving of the external magnetic field change with small strength at the indoor temperature. The chemical formula of the alloy is CoxNiyAlzCej, wherein 18<=x<=43, 27<=y<=34, 26<=z<=40, 1<=j<=15, x+y+z+j=100, and x, y, z and j represent the molar percentages. Compared with existing materials, the rare earth magnetic material has the low martensite twin crystal migration starting critical stress, wide magnetic-induced strain temperature range, high magnetic-induced strain capacity and good mechanical property and has important application value in the fields of micro displacement machines used at the indoor temperature, vibrating and noise control, linear motors, microwave devices, robots and the like.

Description

technical field [0001] The invention belongs to the field of shape-memory materials, and relates to a rare-earth magnetically controlled shape-memory alloy with low start-up critical stress and a preparation method thereof. Background technique [0002] With the continuous development of the application of traditional shape memory alloys, the limitations of the thermoelastic shape memory effect began to appear in practical applications. Memory effect has become a hotspot in the research of smart materials. [0003] At present, the most researched and most widely used is Ni 2 MnGa alloys, but most of these alloys are relatively brittle and have relatively low phase transition temperatures, which are difficult to meet the needs of engineering applications and limit their wide-scale promotion in engineering applications. [0004] In this context, new ferromagnetic shape memory alloys represented by Co-Ni bases have attracted the attention of scholars at home and abroad. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/07C22C30/00C22C1/02C22F1/10C22F1/16H01F1/153
CPCC22C1/02C22C19/07C22C30/00C22F1/10C22F1/16H01F1/15325
Inventor 巨佳巴志新娄许诺上官远东牟键南阮婷刘壮
Owner 来安县永阳知识产权运营有限公司
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