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Boron-containing shape memory alloy and preparation method thereof

A memory alloy and alloy technology, applied in the field of shape memory alloys, can solve problems such as lattice distortion, alloy slip memory performance, and poor room temperature plastic deformation ability.

Inactive Publication Date: 2021-10-19
GUANGDONG INST OF MATERIALS & PROCESSING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The matrix strength of NiTi binary alloy is low, and the critical shear stress of martensitic transformation is not significantly higher than the critical stress of plastic slip, so the alloy is prone to slip during deformation, resulting in deterioration of memory performance.
For example, adding Hf to the binary NiTi alloy will cause serious lattice distortion, resulting in poor plastic deformation ability at room temperature.
At present, the single maximum cold deformation of NiTiHf alloy is less than 20%, which seriously restricts the process forming of subsequent parts

Method used

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  • Boron-containing shape memory alloy and preparation method thereof
  • Boron-containing shape memory alloy and preparation method thereof

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preparation example Construction

[0032] Embodiments of the present invention also provide a method for preparing a boron-containing shape memory alloy according to any one of the foregoing embodiments, comprising the following steps:

[0033] S1: push the cleaned Ni raw material, Ti raw material, Zr raw material and B raw material into the smelting chamber respectively through the feeding system to obtain molten metal.

[0034] In detail, the cleaning step specifically includes removing the oxide films on the surfaces of the Ni raw material, the Ti raw material, the Zr raw material and the B raw material, respectively, and pretreatment by ultrasonic cleaning respectively. Cleaning to remove the oxide film can effectively remove surface impurities and ensure that the reaction can form a boron-containing shape memory alloy with high strength, toughness, high elasticity and good recovery performance.

[0035] Meanwhile, in an embodiment of the present invention, the vacuum degree of the smelting chamber is less ...

Embodiment 1

[0047] This embodiment provides a boron-containing shape memory alloy, which is prepared by the following steps:

[0048] S1: In terms of atomic percent content, the following raw materials were weighed: 50.0at% Ni, 48.0at% Ti, 1.0at% Zr and 1.0at% B;

[0049] S2: After removing the oxide film on the surface of Ni raw material, Ti raw material, Zr raw material and B raw material respectively, pretreatment by ultrasonic cleaning respectively;

[0050] S3: Push the cleaned Ni raw materials, Ti raw materials, Zr raw materials and B raw materials into the melting chamber through the feeding system respectively, and keep the vacuum degree in the melting chamber at 1×10 -2 Pa, filled with argon gas with a purity of 99.99wt%, under the irradiation of an electron beam with a voltage of 25kV and a current of 3A to obtain molten metal;

[0051] S4: A part of the molten metal is continuously irradiated by the electron beam and then dropped into the water-cooled copper bed to form a soli...

Embodiment 2

[0057] This embodiment provides a boron-containing shape memory alloy, which is prepared by the following steps:

[0058] S1: In terms of atomic percentage, the following raw materials were weighed: 50.0at% Ni, 46.0at% Ti, 3.0at% Zr and 1.0at% B;

[0059] S2: After removing the oxide film on the surface of Ni raw material, Ti raw material, Zr raw material and B raw material respectively, pretreatment by ultrasonic cleaning respectively;

[0060] S3: Push the cleaned Ni raw materials, Ti raw materials, Zr raw materials and B raw materials into the melting chamber through the feeding system respectively, and keep the vacuum degree in the melting chamber at 1×10 -2 Pa, filled with argon gas with a purity of 99.99wt%, under the irradiation of an electron beam with a voltage of 25kV and a current of 3A to obtain molten metal;

[0061] S4: Continuously irradiating a part of the molten metal to be melted by electron beam irradiation and then dripping into the water-cooled copper bed...

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Abstract

The invention discloses a boron-containing shape memory alloy and a preparation method thereof. The boron-containing shape memory alloy is prepared from Ni, Ti, Zr and B, and the chemical formula of the boron-containing shape memory alloy is Ni < 51-y > Ti < 49-x > Zr < x > By, wherein, x is equal to 1.0-5.0, y is equal to 1.0-3.0, and x and y are the mole percent of Zr and the mole percent of B in the alloy respectively. According to the boron-containing shape memory alloy, a boron element is added to form TiB2 particles with the nanoscale, the TiB2 particles serve as heterogeneous nucleation cores to refine a matrix structure to improve the strength of the alloy and improve the plasticity of the alloy, and therefore the alloy has the advantages of being high in toughness and elasticity and good in recoverability, and the use requirements of the shape memory alloy on high thermal stability and excellent plasticity can be met; and the preparation method of the boron-containing shape memory alloy is simple in overall process, easy in control, easy in realizing continuous production and low in production cost.

Description

technical field [0001] The invention relates to the technical field of shape memory alloys, in particular to a boron-containing shape memory alloy and a preparation method thereof. Background technique [0002] Shape memory alloys are unique materials that can deform and return to a predetermined shape after unloading or heating. So far, there are three main types of shape memory alloys with practical application value: Ni-Ti-based, Fe-based and Cu-based memory alloys, among which Ni-Ti-based memory alloys have good shape memory properties, strong fatigue resistance, high strength, and biological Excellent compatibility and other characteristics, suitable for applications in most fields. Fe-based and Cu-based memory alloys are relatively low in cost, but their poor stability and thermomechanical properties limit their development and application. Even the most mature NiTi shape memory alloy currently has low tensile strength and martensitic transformation temperature, whic...

Claims

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Application Information

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IPC IPC(8): C22C19/03C22C30/00C22B9/22C22C1/02C22F1/00C22F1/10
CPCC22C19/03C22C30/00C22C1/02C22C1/023C22B9/228C22F1/10C22F1/006
Inventor 黎小辉甘春雷周楠郑开宏
Owner GUANGDONG INST OF MATERIALS & PROCESSING
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