A method for fabricating two-way memory devices using double-constraint annealing

A device, two-way technology, applied in the field of two-way memory device manufacturing by annealing nickel-titanium-based alloys with solid solution and aging double constraints, can solve the problem of sensitivity to training temperature, setting temperature and training times, poor pre-design of double memory stroke, Two-way memory performance and stability are poor, achieving the effects of strong industrial practicability, low cost, and large strain.

Inactive Publication Date: 2011-12-07
西安赛特金属材料开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are very few studies on the direct production of two-way memory devices, and most of them are in the research and development stage. However, some production methods such as thermomechanical training methods have been proposed. The production process is very complicated and is very sensitive to training te

Method used

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  • A method for fabricating two-way memory devices using double-constraint annealing
  • A method for fabricating two-way memory devices using double-constraint annealing
  • A method for fabricating two-way memory devices using double-constraint annealing

Examples

Experimental program
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Example Embodiment

[0024] Example 1:

[0025] A binary nickel-titanium memory alloy with a composition of Ni: 56 wt.% and Ti: 44 wt.% is selected, and the raw material is a wire with a diameter of 0.8 mm. The wire is wound on a Φ8mm spiral spring mold according to the pre-strain. The pre-strain is ε=10%. The spring parameters are: pitch d=0mm, number of turns n=10, spring length L1=8.5mm, and the wire The shape of the material is fixed, and it is placed in a constant temperature furnace at 650℃ for 0.5h and water-cooled. The obtained spring was stretched again and constrained to a length of L2=22.5mm, then fixed, and placed in a constant temperature furnace at 500°C for 2 hours and air-cooled. Take out the prepared spring device, the action diagram of the two-way memory spring is as follows figure 2 As shown, the two-way stroke is: the spring stretches when the temperature is raised, and the spring contracts when the temperature is lowered.

[0026] Place the spring in a displacement-temperature t...

Example Embodiment

[0028] Example 2:

[0029] The selected composition is Ni: 55.7wt.%, Ti: 44wt.%, Cr: 0.3wt.% ternary nickel-titanium memory alloy, and the raw material is a wire with a diameter of Φ1.0mm. The wire is wound on a Φ12mm spiral spring mold according to pre-strain. The pre-strain is ε=8.3%, the spring parameters are: pitch d=2.0mm, number of turns n=6, spring length L 1 =20mm, the shape of the wire is fixed, and it is placed in a constant temperature furnace at 700°C for 45 minutes and water-cooled. Compress and constrain the obtained spring to L again 2 =10mm length, then fix it, put it in a constant temperature furnace at 450°C for 1 hour, air cooling. Take out the prepared spring device, the action diagram of the two-way memory spring is as follows figure 2 As shown, the two-way stroke is: the spring contracts when heating up, and the spring stretches when cooling down.

[0030] After testing, the spring's heating start temperature is 3°C, which corresponds to the inverse martensi...

Example Embodiment

[0031] Example 3:

[0032] The selected composition is Ni: 55.4wt.%, Ti: 44wt.%, V: 0.6wt.% ternary nickel-titanium memory alloy, and the raw material is a wire with a diameter of 1 mm. The wire is wound on the flat mold of the special-shaped tower spring according to pre-strain. The pre-strain range is ε=5-20%. The special-shaped tower spring is fixed and placed in a constant temperature furnace at 720°C for 0.5h. Air cooling. The obtained special-shaped tower spring was again vertically stretched to a fixed mold with a height of 35mm, and then placed in a constant temperature furnace at 500°C for 2 hours and furnace cooling. The phase transition temperature Af=43°C of the spring is measured by the bending test. Put the special-shaped tower spring device in hot water above 60℃, and the height of the spring is measured to be 35mm, and then put the spring into alcohol at -10℃, and the height of the spring is measured to be 3mm. After 1000 cycles of cooling and heating, the high...

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Abstract

The double-constraint annealing method for manufacturing a two-way memory device disclosed by the invention is made by using binary or multi-component nickel-titanium-based shape memory alloys. Two-way memory devices are obtained through the following annealing process: the constrained strain ranges from 1% to 50%, the annealing sequence is solid solution first and then aging, and the solid solution temperature for shaping the low-temperature shape is 600°C to 850°C, and the time is 15min to After 60 minutes, the obtained device is subjected to secondary constrained aging treatment according to its high-temperature shape, the aging temperature is 350°C-50°C, and the aging time is 0.5h-6h, and the device of the present invention is obtained. The device can obtain the two-way memory function without any mechanical training. The two-way memory has high stability, strong anti-fatigue performance, and can be used thousands of times. Two-way memory devices can use raw materials such as wire, rod and plate to make tension (compression) springs, disc springs, torsion springs, special-shaped springs, rings and other forms. The production method of the invention has the advantages of simple and convenient production, low cost, high efficiency, strong shape design and practicability, and the like.

Description

technical field [0001] The invention relates to a method for manufacturing a two-way memory device by double-constraint annealing, which belongs to the technical application field of shape memory alloys, and particularly relates to a method for manufacturing a two-way memory device by annealing a nickel-titanium-based alloy through solid solution aging and double-constraint annealing . Background technique [0002] Nickel-titanium-based shape memory alloy has a unique shape memory effect and superelasticity, excellent wear resistance, corrosion resistance and damping properties, and good mechanical properties. It has a wide range of applications, involving machinery, electronics, chemical industry, energy, construction, and medical treatment. and aerospace fields. As a functional material, shape memory alloys have one-way, two-way and full-range memory effects, among which the two-way memory effect is more eye-catching. In many fields, the two-way action can only be comple...

Claims

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Application Information

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IPC IPC(8): C22F1/10C22C19/05
Inventor 王建淦曹继敏牛中杰田成民雷亚军杨宏进毛江虹
Owner 西安赛特金属材料开发有限公司
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