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Method for preparing nickel-titanium shape memory alloy with gradient nano-grain structure

A nano-grain and memory alloy technology, which is applied in metal rolling, manufacturing tools, heat treatment equipment, etc., can solve problems such as limited strength and fatigue life, degradation of material mechanical properties, and reduced component stability, so as to reduce energy consumption Dispersion, low cost, high precision effect

Inactive Publication Date: 2021-06-29
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional commercial coarse-grained nickel-titanium alloys have good ductility and considerable latent heat of phase transformation, but the huge energy dissipation (hysteresis loop area) during the phase transformation process will accelerate the mechanical property degradation and fatigue failure of the material, while reducing the Stability of components during service
In addition, the application of commercial coarse-grained NiTi alloys is often limited by their limited strength and fatigue life

Method used

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  • Method for preparing nickel-titanium shape memory alloy with gradient nano-grain structure
  • Method for preparing nickel-titanium shape memory alloy with gradient nano-grain structure
  • Method for preparing nickel-titanium shape memory alloy with gradient nano-grain structure

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Embodiment Construction

[0020] Below by example, in conjunction with the accompanying drawings, the technical solution of the present invention is further specifically described, as figure 1 As shown, a method for preparing a gradient nanograin structure nickel-titanium shape memory alloy, a commercial coarse-grained superelastic nickel-titanium alloy plate with an initial thickness of 1.5 mm and a chemical composition of 50.8% atomic nickel and 49.2% titanium is as follows For processing:

[0021] A. Through repeated cold rolling, the final thickness of the plate is 1mm, and the average grain size is about 14nm;

[0022] B, polishing all surfaces of the above-mentioned ultrafine nanocrystals to a mirror surface;

[0023] C. Surface scanning is carried out on the polished ultrafine nanocrystalline nickel-titanium substrate with a continuous laser power of 100W, the scanning speed is 1000mm / s, and the scanning line spacing is 30μm.

[0024] In step A, the ultrafine nanocrystalline nickel-titanium al...

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Abstract

The invention provides a method for preparing a nickel-titanium shape memory alloy with a gradient nano-grain structure. The method for preparing the nickel-titanium shape memory alloy with the gradient nano-grain structure is characterized by comprising the following steps of: 1, preparing a superfine nano-grain nickel-titanium alloy matrix with the average grain size of about 5 to 20nm through a strong plastic deformation process; 2, polishing the surface of the superfine nano-grain nickel-titanium alloy obtained in the step 1 to be a mirror surface; and 3, carrying out surface heat treatment on the superfine nano-grain matrix obtained in the step 2 through continuous laser with the power being 50 to 300 W, wherein the laser scanning speed is 400 to 2000 mm / s, and the distance between scanning lines is 5 to 100 microns. According to the method for preparing the nickel-titanium shape memory alloy with the gradient nano-grain structure provided by the invention, the nickel-titanium alloy with the gradient nano-grain structure is prepared by combining a traditional cold machining technology and an emerging laser machining technology, the nickel-titanium alloy with the gradient nano-grain structure can give consideration to the strength and the ductility of the material, meanwhile, energy dissipation in the phase change process is reduced, the service life is prolonged, and the mechanical property stability is improved. In addition, the process is simple to operate, relatively high in precision and low in cost, can be quickly produced and put into use, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of adjusting and controlling the macroscopic mechanical properties of the metal by designing the microstructure, and specifically relates to a method for preparing a nickel-titanium shape memory alloy with a gradient nano-grain structure. Background technique [0002] Nickel-titanium shape memory alloys are widely used in aerospace, microelectronic devices, biomedicine, solid-state refrigeration and other fields due to their unique superelasticity, shape memory, corrosion resistance and biocompatibility. Traditional commercial coarse-grained nickel-titanium alloys have good ductility and considerable latent heat of phase transformation, but the huge energy dissipation (hysteresis loop area) during the phase transformation process will accelerate the mechanical property degradation and fatigue failure of the material, while reducing the Stability of components during service. In addition, the application of commercial...

Claims

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Application Information

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IPC IPC(8): C22F1/02C22F1/10C21D9/00B21C1/00B21C23/00B21C23/02B21B1/22B24B29/02
CPCB21B1/22B21B2001/221B21C1/003B21C23/002B21C23/02B24B29/02C21D9/0081C22F1/02C22F1/10
Inventor 陈俊余方刚雷丽萍
Owner TSINGHUA UNIV
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