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.
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[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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