Mesothermal heat process method for improving hyperelasticity of NiTiV shape memory alloy

A heat treatment method and memory alloy technology, applied in the field of shape memory alloys

Inactive Publication Date: 2008-09-24
ZHENJIANG YINUOWEI SHAPE MEMORY ALLOYS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few studies on the superelasticity of NiTiV by medium temperature heat treatment. The present inve

Method used

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  • Mesothermal heat process method for improving hyperelasticity of NiTiV shape memory alloy
  • Mesothermal heat process method for improving hyperelasticity of NiTiV shape memory alloy
  • Mesothermal heat process method for improving hyperelasticity of NiTiV shape memory alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The selected components are Ni: 56.45 wt %; Ti: 42.88 t %; V: 0.67 wt %. , the phase transition point A f =-15 ℃ memory alloy wire, heat treatment at medium temperature according to Table 1. The test wire of NiTiV shape memory alloy with a length of 11 cm and a diameter of 1.19 mm was selected, and the medium temperature heat treatment process shown in Table 1 was adopted.

[0011] Table 1 Heat treatment process

[0012] Tab 1 The Heat Treatment Method

[0013]

[0014]

[0015] The NiTiV shape memory alloy wire treated at medium temperature was subjected to tensile test in WDW-10 microcomputer-controlled electronic universal tensile testing machine. Tensile tests yield different curves ( Figures 1 to 4 ), it can be seen from the curve that the superelasticity of the NiTiV shape memory alloy is significantly affected by the medium temperature heat treatment: at the medium temperature heat treatment temperature of 440 °C, the heat preservation for 20min shows ...

Embodiment 2

[0017] The selected components are: Ni: 55.5 wt %; Ti: 41.8 t %; V: 0.57 %. Phase transition point A f =-5℃ memory alloy wire. The NiTiV shape memory alloy wire subjected to the same medium temperature treatment as in Example 1 was subjected to a tensile test in a WDW-10 microcomputer-controlled electronic universal tensile testing machine. get as Figure 5 The curves shown, from Figure 5 It can be seen that the NiTiV shape memory alloy exhibits complete nonlinear superelasticity at the medium temperature heat treatment temperature of 440 °C for 20 min, and its superelasticity reaches the maximum value.

Embodiment 3

[0019] The selected components are Ni: 57.3 wt%; Ti: 43.4 t%; V: 0.73%. , the phase transition point A f = -35°C memory alloy wire, NiTiV shape memory alloy wire subjected to the same medium temperature treatment as in Example 1, and the tensile test was carried out on a WDW-10 microcomputer-controlled electronic universal tensile testing machine. get as Image 6 The curves shown, from Image 6 It can be seen that the NiTiV shape memory alloy exhibits complete nonlinear superelasticity at the medium temperature heat treatment temperature of 440 °C for 20 min, and its superelasticity reaches the maximum value.

[0020] The NiTiV shape memory alloy used for microstructure analysis was inlaid on an XQ-2 sample inlay machine, and the inlaid wire was polished and etched with an etchant (hydrofluoric acid:nitric acid=1:2.5). The corroded samples were observed under a microscope. According to the metallographic structure ( Figures 7 to 10 ), it can be seen that the NiTiV shape ...

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Abstract

A middle temperature processing method for improving the superelasticity of NiTiV shape memory alloy is characterized by treating the NiTiV shape memory alloy( the component range is: 55.5 to 57.3 percent of Ni, 41.8 to 43.4 percent of Ti and 0.57 to 0.73 percent of V) with middle temperature processing. A phase transition point Af is equal to minus 35 DEG C to minus 5 DEG C; when the middle temperature processing temperature is 440 DEG C and the temperature is maintained for 20min, very perfect nonlinear superelasticity can be achieved and the superelasticity of the NiTiV shape memory alloy reaches maximum.

Description

technical field [0001] The invention relates to the field of shape memory alloys, in particular to a medium-temperature heat treatment method for improving the superelasticity of NiTiV shape memory alloys. Background technique [0002] In recent years, NiTi-based shape memory alloys have been widely used for their excellent memory effect, superelasticity and good machinability. NiTi-based shape alloys in a superelastic state have important practical value due to their good elasticity, specific strength, biocompatibility, corrosion resistance, friction resistance and high damping properties. At present, the research on superelasticity of memory alloys mainly focuses on NiTi. References [1] (Zhao Liancheng, Cai Wei, Zheng Yufeng. Shape memory effect and superelasticity of alloys. Beijing, National Defense Industry Press, 2002) and references [1] 2] (Zhang C S, Wang Y Q, Cheng J X et al. Pseudoelasticity of Near-Equiatomic Ni-Ti Shape Memory Alloys. Proc. 1st Iht. Conf. on Sha...

Claims

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Application Information

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IPC IPC(8): C22F1/10
Inventor 司松海司乃潮
Owner ZHENJIANG YINUOWEI SHAPE MEMORY ALLOYS
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