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Method of improving superelasticity of NiTiCrRE shape memory alloy through solid solution treatment

A memory alloy and solution treatment technology, applied in the field of shape memory alloys, can solve problems such as unpublished patents

Inactive Publication Date: 2011-01-19
ZHENJIANG YINUOWEI SHAPE MEMORY ALLOYS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method of improving superelasticity of NiTiCrRE shape memory alloy through solid solution treatment
  • Method of improving superelasticity of NiTiCrRE shape memory alloy through solid solution treatment
  • Method of improving superelasticity of NiTiCrRE shape memory alloy through solid solution treatment

Examples

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Effect test

Embodiment 1

[0011] The selected components are: Ni: 55.6wt%; Ti: 42.43wt%; Cr: 0.71wt%; RE: 1.26wt%. A NiTiCrRE shape memory alloy wire with a length of 12 cm and a diameter of 1.16 mm.

[0012] After heat preservation at 620°C for 40 minutes, heat preservation at 660°C for 40 minutes, heat preservation at 680°C for 40 minutes, and heat preservation at 680°C for 80 minutes after solution treatment and aging, the tensile test was carried out on a WDW-10 computer-controlled electronic universal tensile testing machine. Different tensile force-deformation relationship curves are obtained. Through the tensile test curve (see figure 1 ) It can be seen that when the solution temperature is lower than 700 °C, the alloy cannot exhibit complete nonlinear superelasticity, but with the increase of the solution temperature and the extension of the holding time, the residual deformation of the alloy is continuously decreasing. This shows that the superelasticity of the alloy increases with the incre...

Embodiment 2

[0014] The selected components are: Ni: 56.1wt%; Ti: 41.91wt%; Cr: 0.58wt%; RE: 1.41wt%. A NiTiCrRE shape memory alloy wire with a length of 12 cm and a diameter of 1.21 mm.

[0015] Put the memory alloy wire after solid solution treatment and aging at 700°C on a WDW-10 microcomputer-controlled electronic universal tensile testing machine for tensile test. The loading rate of the test is 1mm / min, and it is kept at 2.7KN for 2 seconds. After 10 minutes, unload at a rate of 1 mm / min to obtain different tensile force-deformation curves. Through the tensile test curve (see figure 2 ) It can be seen that when the solution temperature reaches 700°C, the elasticity of the alloy increases continuously with the increase of the holding time, and after the holding time reaches 60 minutes, the sample reaches complete nonlinear superelasticity. However, when the holding time continues to increase, the residual deformation of the alloy ( figure 2 -d) increases instead, and the superela...

Embodiment 3

[0017] The selected composition is Ni: 57wt%; Ti: 41.05wt%; Cr: 0.65wt%; RE: 1.3wt%. A NiTiCrRE shape memory alloy wire with a length of 13 cm and a diameter of 1.29 mm.

[0018] Put the memory alloy wire after solid solution treatment and aging at 720°C on a WDW-10 microcomputer-controlled electronic universal tensile testing machine for tensile test. The loading rate of the test is 1mm / min, and it is kept at 2.7KN for 2 seconds. After 10 minutes, unload at a rate of 1 mm / min to obtain different tensile force-deformation curves. Depend on image 3 It can be seen that the sample cannot exhibit complete nonlinear hyperelasticity, and has a large residual deformation. In a small holding time, the superelasticity of the sample ( image 3 -a, b) increase with time, but as the holding time increases, when the alloy is held at 720°C for 60 minutes, the superelasticity of the alloy decreases instead ( image 3 -c); when the holding time continues to increase, the residual deforma...

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Abstract

The invention relates to a method of improving the superelasticity of the NiTiCrRE shape memory alloy through solid solution treatment, which is characterized in that the NiTiCrRE shape memory alloy is subjected to the solid solution treatment for 60min at the constant temperature of 700 DEG C, and then the NiTiCrRE shape memory alloy is subjected to the aging treatment to have completely nonlinear optimal superelasticity. The NiTiCrRE shape memory alloy comprises the following components by weight percent: 55.1-57.5 percent of Ni, 41.5-43.7 percent of Ti, 0.4-0.9 percent of Cr and 0.1-2 percent of RE.

Description

technical field [0001] The invention relates to the field of shape memory alloys, in particular to a solution treatment method for improving the superelasticity of NiTiCrRE shape memory alloys. Background technique [0002] Near equiatomic NiTi alloys are widely used due to their good shape memory effect and superelasticity, and these excellent properties can be adjusted by heat treatment. Usually, the most commonly used heat treatment methods in NiTi multi-component alloys are solution treatment and aging treatment. Aging treatment can precipitate Ti in Ni-rich NiTi alloy 3 Ni 4 Phase, thereby changing the phase transformation behavior and mechanical properties of the alloy, so it has also received extensive attention and research from scholars. In the actual production and application process, it is often necessary to have a large amount of deformation of the NiTiCrRE shape memory alloy. For example, in the actual production of spectacle frames, it is necessary to have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/10
Inventor 司松海司乃潮
Owner ZHENJIANG YINUOWEI SHAPE MEMORY ALLOYS
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