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Low-temperature hyperelastic Ti-Ni-Cu-Y-Hf shape memory alloy and preparation method thereof

A ti-ni-cu-y-hf, memory alloy technology, applied in the field of low-temperature superelastic Ti-Ni-Cu-Y-Hf shape memory alloy and its preparation, can solve the problem of low-temperature superelasticity, phase transition temperature Advanced problems, to achieve the effect of improving the mechanical properties of alloys, good mechanical properties, improving oxidation resistance and memory properties

Active Publication Date: 2020-07-14
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the Ti-Ni-Cu-Hf shape memory alloy that has been reported in the literature has a martensitic transformation temperature higher than 38°C, and only after deformation and heating can it have a shape memory effect of 3.06%, and the recovery rate is only 87%. low temperature superelastic

Method used

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  • Low-temperature hyperelastic Ti-Ni-Cu-Y-Hf shape memory alloy and preparation method thereof
  • Low-temperature hyperelastic Ti-Ni-Cu-Y-Hf shape memory alloy and preparation method thereof
  • Low-temperature hyperelastic Ti-Ni-Cu-Y-Hf shape memory alloy and preparation method thereof

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Experimental program
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Embodiment 1

[0039] Using high-purity metal Ti, Ni, Cu, Y, and Hf as raw materials, after cleaning, the atomic ratio of 39% Ti, 44% Ni, 6% Cu, 1% Y and 10% Hf is used as alloy 1 , put the raw material in the vacuum electric arc furnace, vacuumize to 8.5*10 -3Below Pa, refill argon gas to -0.05MPa and then strike the arc, control the melting current at 100-300A, turn on the magnetic stirring power, ensure that all metals are completely melted together, and then turn off the power. The obtained alloy ingot is turned over with a manipulator, and then smelted repeatedly 6 times to make the composition of the raw material uniform; the obtained alloy is cut into small pieces by wire, placed in a vacuum heat treatment furnace and evacuated to -0.05MPa, and then filled with argon. After homogenization at 900°C for 2h, it was quickly quenched in an ice-water mixture to obtain a Ti-Ni-Cu-Y-Hf shape memory alloy.

[0040] The microstructure photo of gained alloy 1 is as follows figure 1 Shown, the ...

Embodiment 2

[0042] Using high-purity metals Ti, Ni, Cu, Y, and Hf as raw materials, after cleaning, the atomic ratio of 43% Ti, 44% Ni, 6% Cu, 1% Y and 6% Hf is the alloy 2 , put the raw material in the vacuum electric arc furnace, vacuumize to 8.5*10 -3 Below Pa, refill argon gas to -0.05MPa and then strike the arc, control the melting current at 100-300A, turn on the magnetic stirring power, ensure that all metals are completely melted together, and then turn off the power. The obtained alloy ingot is turned over with a manipulator, and then smelted repeatedly 6 times to make the composition of the raw material uniform; the obtained alloy is cut into small pieces by wire, placed in a vacuum heat treatment furnace and evacuated to -0.05MPa, and then filled with argon. After homogenization at 900°C for 2h, it was quickly quenched in an ice-water mixture to obtain a Ti-Ni-Cu-Y-Hf shape memory alloy.

[0043] The microstructure photograph of gained alloy 2 is as Figure 5 As shown, the tr...

Embodiment 3

[0045] Using high-purity metals Ti, Ni, Cu, Y, and Hf as raw materials, after cleaning, the atomic ratio of 47% Ti, 44% Ni, 6% Cu, 1% Y and 2% Hf is used as alloy 3, and the raw materials are placed in In the vacuum electric arc furnace, vacuumize to 8.5*10 -3 Below Pa, refill argon gas to -0.05MPa and then strike the arc, control the melting current at 100-300A to ensure that all metals are completely melted together, and then turn off the power. The obtained alloy ingot is turned over with a manipulator, and then smelted repeatedly 6 times to make the composition of the raw material uniform; the obtained alloy is cut into small pieces by wire, placed in a vacuum heat treatment furnace and evacuated to -0.05MPa, and then filled with argon. After homogenization treatment at 900° C. for 2 hours, the Ti-Ni-Cu-Y-Hf shape memory alloy was obtained by quenching and cooling in ice water.

[0046] The microstructure photograph of gained alloy 3 is as Figure 9 As shown, the transit...

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Abstract

The invention relates to a low-temperature hyperelastic Ti-Ni-Cu-Y-Hf shape memory alloy and a preparation method thereof. The alloy is prepared from the following chemical components including, by atomic percent, 39%-47% of Ti, 42%-46% of Ni, 4%-8% of Cu, 0.5%-1.5% of Y and 2%-10% of Hf. The alloy is prepared by the following method of putting the raw materials including the Ti, the Ni, the Cu, the Y and the Hf in a vacuum arc melting furnace according to the component proportion, and repeatedly melting to obtain an alloy ingot; cutting the alloy ingot into a required shape, placing the alloyingot in a heat treatment furnace, filling argon, and performing homogenization treatment; rapidly putting the homogenized alloy ingot into an ice-water mixture, and carrying out quenching treatmentso as to obtain a solid solution state Ti-Ni-Cu-Y-Hf shape memory alloy; and cutting the solid solution state alloy into rod-shaped samples, and carrying out cyclic compression memory training to obtain the rod-shaped shape memory alloy with the higher recovery rate and superelasticity. The preparation method is low in cost, simple in process and easy to operate, and the prepared shape memory alloy has high recoverable strain and good low-temperature superelasticity and has potential application value.

Description

technical field [0001] The invention belongs to the technical field of alloy materials and their preparation, and in particular relates to a low-temperature superelastic Ti-Ni-Cu-Y-Hf shape memory alloy and a preparation method thereof. Background technique [0002] The shape memory effect refers to certain materials with thermoelasticity or stress-induced martensitic transformation. In the martensitic state, a certain degree of deformation is carried out, and the subsequent heating exceeds the critical temperature of the martensitic reverse phase transformation. When the material can completely return to the shape and volume before deformation, the alloy with this effect is called shape memory alloy. Superelastic alloys are a type of shape memory alloys. When uniaxial stress is applied above the end temperature of inverse martensite transformation and below the upper limit temperature of superelasticity, the alloy undergoes stress-induced martensitic transformation, result...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03C22C30/02C22C1/02C22F1/10
CPCC22C1/02C22C19/03C22C30/02C22F1/002C22F1/006C22F1/10
Inventor 赵光伟陈健丁翀
Owner CHINA THREE GORGES UNIV
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