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Technique for enhancing super-elasticity of nickel titanium vanadium memory alloy by cold deformation

A memory alloy and superelastic technology, applied in the field of memory alloys, can solve the problems of lack of systematic research on martensite structure, no patents published, and few researches on memory alloys.

Inactive Publication Date: 2012-11-07
ZHENJIANG YINUOWEI SHAPE MEMORY ALLOYS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the improvement of production technology and the progress of science and technology, people's research on memory alloys has gradually deepened, and some research has also been done on the superelasticity of memory alloys. very little research
At present, due to the lack of systematic research on the linear superelasticity of cold-deformed TiNi alloys and its influencing factors and the lack of systematic research on the martensite structure in cold-deformed TiNi alloys, the engineering application of TiNi alloy superelasticity has been seriously affected.
However, there is less research on the nickel-titanium-vanadium shape memory alloy based on the TiNi alloy, which seriously hinders the application and development of the nickel-titanium-vanadium shape memory alloy. Process for Improving the Superelasticity of Nickel-Titanium-Vanadium Memory Alloy
After inquiry, no relevant patents have been published

Method used

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  • Technique for enhancing super-elasticity of nickel titanium vanadium memory alloy by cold deformation
  • Technique for enhancing super-elasticity of nickel titanium vanadium memory alloy by cold deformation
  • Technique for enhancing super-elasticity of nickel titanium vanadium memory alloy by cold deformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The selected composition is, Ni: 55.5wt%; Ti: 41.8t%; V: 0.57%. Phase transition point A f =-5°C memory alloy wire, cold deformed according to Table 1, select the NiCTir shape memory alloy wire with a length of 11cm and a diameter of 1.19mm, and use YJ-450 hydraulic forming machine to deform it by cold pressing. Use a pressure of 6MPa-14MPa (the wire will not be able to withstand the pressure and crack under a pressure greater than 14Mpa) to cold deform the memory alloy wire (the relationship between the pressure and the amount of cold deformation is determined by the formula to be calculated as shown in Table 1).

[0021] serial number Pressure size (MPa) Deformed thickness (mm) Cold deformation (%) original sample 0 — — 1 6 1.1625 4.5% 2 7 1.14 8.2% 3 8 1.099 15% 4 9 1.0675 20% 5 10 1.045 23% 6 11 1.018 27% 7 12 0.992 30% 8 13 0.973 33%

[0022] The cold-deformed memory alloy wire i...

Embodiment 2

[0024] The selected composition is Ni: 57.3wt%; Ti: 43.4t%; V: 0.73%. , phase transition point A f =-35 ℃ of memory alloy wire, as in Example 1, cold deformation is carried out according to Table 1, and the memory alloy wire through cold deformation is subjected to a tensile test on a WDW-10 microcomputer-controlled electronic universal tensile testing machine to test Its super elastic. by tensile test curve (see figure 1 g) It can be seen that when the cold deformation is 27%, the superelasticity has reached the best ( figure 1 g).

[0025] At the same time, alloy wires with different amounts of cold deformation are inlaid on the XQ-2 sample inlaying machine. The inlaid wires are polished, polished, and corroded with corrosive agents. The etchant is hydrofluoric acid: nitric acid = 1:2.5. The corroded samples were observed under an optical microscope. It can be seen that the cold deformation produces a martensite modification inside the NiTiV. When the cold deformation ...

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Abstract

A technique for enhancing super-elasticity of nickel titanium vanadium memory alloy by cold deformation belongs to the field of memory alloys. The technique is characterized by performing cold deformation to the nickel titanium vanadium memory alloy, wherein the nickel titanium vanadium memory alloy comprises the following components in percentage by weight: 55.5-57.3% of Ni, 41.8-43.4% of Ti, and 0.57-0.73% of V; the phase transformation point Af is equal to (-35) DEG C to (-5) DEG C; and when the cold deformation amount is 15-33%, the volume of alloy Martensitic variant is greatly increased, and thus the alloy obtains good super-elasticity.

Description

technical field [0001] The invention belongs to the field of memory alloys, in particular to a process for improving the superelasticity of nickel-titanium-vanadium memory alloys through cold deformation. Background technique [0002] With the rapid development of shape memory alloys, NiTi-based alloys have been widely used for their excellent shape memory effect, superelasticity and good mechanical properties. In memory alloys, cold deformation can greatly strengthen the parent phase due to the introduction of a large number of dislocations, and the strengthened parent phase can enhance the superelasticity of the alloy to a large extent. This phenomenon has been obtained in TiNi shape memory alloys. confirmed. In recent years, people have devoted themselves to the study of the shape memory properties of NiTiX ternary alloys and have achieved extremely valuable research results. With the improvement of production technology and the advancement of science and technology, pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C22C19/03
Inventor 司松海刘光磊李晓薇杨 嵩张扣山
Owner ZHENJIANG YINUOWEI SHAPE MEMORY ALLOYS
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