A kind of rapid solidification preparation method of ultra-high-strength plastic tininbmo shape memory alloy

A memory alloy and ultra-high-strength technology, applied in the field of functional materials, can solve the problems that the strength, plasticity and memory effect are difficult to balance, and the comprehensive performance has not been significantly improved, so as to improve solid solubility, good compactness, and reduce eutectic The effect of organizational formation

Inactive Publication Date: 2017-01-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scholars at home and abroad have studied TiNi, TiNiCu and other TiNi-based materials through the copper mold vacuum suction casting method, and have made some progress, but it is difficult to balance the strength, plasticity and memory effect, and the comprehensive performance has not been significantly improved.

Method used

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  • A kind of rapid solidification preparation method of ultra-high-strength plastic tininbmo shape memory alloy
  • A kind of rapid solidification preparation method of ultra-high-strength plastic tininbmo shape memory alloy
  • A kind of rapid solidification preparation method of ultra-high-strength plastic tininbmo shape memory alloy

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preparation example Construction

[0027] In a specific embodiment, the rapid solidification preparation method of the ultra-high-strength plastic TiNiNbMo shape memory alloy of the present invention, the specific process steps are as follows:

[0028] (1) Cut out sufficient quality TiNiNbMo shape memory alloy according to the size of the copper mold, and treat the surface of the alloy, then use acetone and alcohol to perform ultrasonic cleaning, dry and remove water for later use;

[0029] (2) Put the pretreated alloy material into a vacuum electric arc furnace, and heat it under the protection of argon until it melts completely;

[0030] (3) Keep the molten alloy in a quartz tube for 1 to 3 hours to ensure that the composition of the alloy is uniform and minimize segregation;

[0031] (4) The molten alloy is sucked into the water-cooled copper mold to cool under the pressure difference between the vacuum tube and the molten pool, and the mold is opened and taken out.

[0032] Wherein, the composition of the ...

Embodiment 1

[0035] In this embodiment, the ingot size is designed to be Φ8×60mm, and 45g of TiNiNbMo shape memory alloy is cut out, and its composition ratio is Ti: 46.1at%, Ni: 43.4at%, Nb: 9at%, and the balance is Mo.

[0036] The surface of the sample is descaled, cleaned with acetone and alcohol, and dried; the dried alloy material is placed in a vacuum electric arc furnace, heated to a molten state under the protection of argon, and repeated 5 to 6 times ; Keep the molten metal at 1450°C for 1 hour to fully homogenize the alloy; properly increase the temperature to 1500°C to improve the fluidity of the molten metal, and the molten alloy is sucked into the water-cooled copper mold quickly under the pressure difference between the vacuum tube and the molten pool Cooling (this embodiment cooling rate is 10 3 K / s), open the mold and take it out.

[0037] Such as figure 1 As shown, Ti made from copper mold vacuum suction casting method 46.1 Ni 43.4 Nb 9 Mo 1.5 It can be seen from th...

Embodiment 2

[0043] In this embodiment, the ingot size is designed to be Φ8×60mm, and 45g of TiNiNbMo shape memory alloy is cut out, and its composition ratio is Ti: 47at%, Ni: 45.5at%, Nb: 6at%, and the balance is Mo.

[0044] The surface of the sample is descaled, cleaned with acetone and alcohol, and dried; the dried alloy material is placed in a vacuum electric arc furnace, heated to a molten state under the protection of argon, and repeated 5 to 6 times ; Keep the molten metal at 1400°C for 2 hours to fully homogenize the alloy; properly increase the temperature to 1450°C to improve the fluidity of the molten metal, and the molten alloy is sucked into the water-cooled copper mold quickly under the pressure difference between the vacuum tube and the molten pool Cooling (this embodiment cooling speed is 10 3 K / s), open the mold and take it out.

[0045] Such as Figure 5 As shown, from Ti 47 Ni 45.5 Nb 6 Mo 1.5 It can be seen from the microstructure photos of the alloy that, compa...

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Abstract

The invention relates to a rapid solidification preparation method of an ultrahigh-strength plasticity TiNiNbMo shape memory alloy, belonging to the field of functional materials. A copper mold absorbing casting method is adopted, the solid solubility of solute atoms is improved by using a copper mold with a cooling medium outside, and due to alloy component optimization, the comprehensive mechanical property of the material is improved on the premise that the shape memory effect of the prepared material is ensured. The yield strength of the material which is rapidly solidified is greater than 800MPa, the compression fracture strength is greater than 3GPa, the compression fracture strain is as high as 40%, the yield strength at -100 DEG C is greater than 700MPa, and the compression fracture strength is approximate to 2.5GPa; compared with an existing balance solidification material, the material prepared by the rapid solidification preparation method disclosed by the invention is greatly improved in property. In addition, the shape memory reversion rate of the material is 84% when the compression deformation of the material is 8%, and thus good comprehensive property is achieved.

Description

technical field [0001] The invention relates to a rapid solidification preparation method of an ultrahigh-strength plastic TiNiNbMo shape memory alloy, belonging to the field of functional materials. Background technique [0002] Shape memory alloys have attracted widespread attention due to their special shape memory effect, good mechanical properties and biocompatibility. Wide range of applications, among which TiNi alloy is the most widely used because of its good corrosion resistance, light weight and high strength. Some people predict that in the near future, smart components such as smart drivers made of TiNi-based shape memory alloys will be widely used in machinery, chemical and other fields. Therefore, it is necessary to continuously improve the comprehensive mechanical properties of materials under the premise of ensuring the shape memory effect of materials. . Therefore, it is of great significance to develop NiTi-based shape memory alloys with good shape memory...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C14/00B22D11/06
Inventor 姜海昌孙红丁付华萌闫德胜陈胜虎宋元元赵明久戎利建
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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