CN101270460A - Mesothermal heat process method for improving hyperelasticity of NiTiV shape memory alloy - Google Patents
Mesothermal heat process method for improving hyperelasticity of NiTiV shape memory alloy Download PDFInfo
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- CN101270460A CN101270460A CNA200810019820XA CN200810019820A CN101270460A CN 101270460 A CN101270460 A CN 101270460A CN A200810019820X A CNA200810019820X A CN A200810019820XA CN 200810019820 A CN200810019820 A CN 200810019820A CN 101270460 A CN101270460 A CN 101270460A
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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
The present invention relates to the shape memory alloy field, refer in particular to a kind of NiTiV of raising super elastic shape memory alloy in warm treatment process.
Background technology
In recent years, the NiTi base marmem was subjected to using widely with its good memory effect, super-elasticity and favorable mechanical processing characteristics.The NiTi base shape alloy that is in superelastic has the characteristic of good elasticity, specific tenacity, bio-compatibility, corrosion-resistant, rub resistance and high damping and has important practical value.Hyperelastic research mainly concentrates on the NiTi to memorial alloy at present, reference [1] (Zhao Liancheng, Cai Wei, Zheng Yufeng. the shape memory effect of alloy and super-elasticity. Beijing, National Defense Industry Press, 2002) and reference [2] (Zhang C S, Wang Y Q, Cheng J X et al.Pseudoelasticityof Near-Equiatomic Ni-Ti Shape Memory Alloys.Proc.1st Iht.Conf.on Shape Memory andSuperelastic Technologies.Asilomar, USA, March.7-10,1994:383～388) think in warm treatment temp the stress-strain curve of cold deformation Ni-Ti alloy sample is had remarkable influence; Along with in the rising of warm treatment temp, stress lags behind and increases, what the platform of corresponding stress-induced martensite phase transformation became on the stress-strain curve is more and more obvious.With regard to aging time, when the NiTi alloy during regular hour, can be separated out a kind of Ni in suitable temperature insulation in the NiTi alloy
4Ti
3Strengthening phase, separating out of this strengthening phase can be strengthened matrix greatly.At present about in warm processing to the hyperelastic research of NiTiV also seldom, the present invention propose a kind of NiTiV of raising super elastic shape memory alloy in warm treatment process.
Summary of the invention
The present invention propose to make NiTiV present non-fully linear hyperelastic in warm treatment process, can play directive function in process of production.
The present invention propose a kind of NiTiV of raising super elastic shape memory alloy in warm treatment process, it is characterized by: (composition range is: Ni:55.5～57.3wt% to the NiTiV shape memory alloy; Ti:41.8～43.4wt%; V:0.57～0.73wt%.Transformation temperature A
f=-35 ℃～-5 ℃) carry out in warm processing, when central warm treatment temp was 440 ℃, insulation 20min can present non-linear completely super-elasticity, this moment, the NiTiV super elastic shape memory alloy reached optimum range.
Description of drawings
The stretching force-strain curve of 410 ℃ of insulations of Fig. 1 20min, the stretching force-strain curve of 440 ℃ of insulations of Fig. 2 20min, the stretching force-strain curve of 460 ℃ of insulations of Fig. 3 20min, the stretching force-strain curve of 490 ℃ of insulations of Fig. 4 20min, the stretching force-strain curve (composition of embodiment 2) of 440 ℃ of insulations of Fig. 5 20min, the stretching force-strain curve (composition of embodiment 3) of 440 ℃ of insulations of Fig. 6 20min.
By Fig. 1～6 as seen, when 440 ℃ of insulation 20min, NiTiV presents non-linear completely super-elasticity, and its super-elasticity reaches maximum value.
The stereoscan photograph of 410 ℃ of insulations of Fig. 7 20min, the stereoscan photograph of 440 ℃ of insulations of Fig. 8 20min, the stereoscan photograph of 60 ℃ of insulations of Figure 94 20min, the stereoscan photograph of 490 ℃ of insulations of Figure 10 20min.
By Fig. 7～10 as seen, martensite quantity increases during 440 ℃ of insulation 20min, and interlacing degree improves.Thereby the super-elasticity of memorial alloy is best.
Embodiment
Embodiment 1:
Be selected to and be divided into Ni:56.45wt%; Ti:42.88t%; V:0.67wt%., transformation temperature A
f=-15 ℃ memory alloy wire material, warm processing in being undertaken by table 1.Selecting length for use is 11cm, and diameter is the test silk of the NiTiV shape memory alloy of 1.19mm, adopt shown in the table 1 in warm treatment process.
Table 1 thermal treatment process
Tab?1?The?Heat?Treatment?Method
The NiTiV shape-memory alloy wire that temperature is handled in the process carries out tension test at WDW-10 microcomputer control polarity formula universal tensile testing machine.Tension test obtains different curve (Fig. 1～4), from the curve as can be seen, the influence of warm processing was remarkable during the super-elasticity of NiTiV shape memory alloy was subjected to: in 440 ℃ under the warm treatment temp, insulation 20min presents non-linear completely super-elasticity, and its super-elasticity reaches the maximum value (see figure 2).
Embodiment 2:
Be selected to and be divided into Ni:55.5wt%; Ti:41.8t%; V:0.57%.Transformation temperature A
f=-5 ℃ memory alloy wire material.NiTiV shape-memory alloy wire through the middle temperature processing identical with embodiment 1 carries out tension test at WDW-10 microcomputer control polarity formula universal tensile testing machine.Obtain curve as shown in Figure 5, as can be seen from Figure 5, the NiTiV shape memory alloy is in 440 ℃ under the warm treatment temp. and insulation 20min presents non-linear completely super-elasticity, and its super-elasticity reaches maximum value.
Embodiment 3:
Be selected to and be divided into Ni:57.3wt%; Ti:43.4t%; V:0.73%., transformation temperature A
f=-35 ℃ memory alloy wire material, the NiTiV shape-memory alloy wire through the middle temperature processing identical with embodiment 1 carries out tension test at WDW-10 microcomputer control polarity formula universal tensile testing machine.Obtain curve as shown in Figure 6, as can be seen from Figure 6, under the warm treatment temp, insulation 20min presents non-linear completely super-elasticity to the NiTiV shape memory alloy in 440 ℃, and its super-elasticity reaches maximum value.
The NiTiV shape memory alloy that will be used for microstructure analysis is inlayed on XQ-2 type sample pointing machine, and the silk after inlaying is through polishing, and polishing back is with etching reagent (hydrofluoric acid: corrosion nitric acid=1: 2.5).Sample after corrosion is placed on microscopically and observes.By metallographic structure figure (Fig. 7～10) as can be seen, the NiTiV shape memory alloy in have thermo-elastic martensite after the warm processing, when central warm treatment temp is too high (more than 460 ℃), martensite quantity reduces, interlacing degree reduces, the strengthening effect of parent phase weakens, thereby superelastic effect is destroyed.
Claims (2)
1, a kind of improve the NiTiV super elastic shape memory alloy in warm treatment process, it is characterized by: (its composition range was: Ni:55.5～57.3wt% in warm processing during the NiTiV shape memory alloy was carried out; Ti:41.8～43.4wt%; V:0.57～0.73wt%; Transformation temperature A
f=-35 ℃～-5 ℃), when central temperature treatment temp was 410～490 ℃, during insulation 20min, the NiTiV shape memory alloy had super-elasticity preferably.
2, described by right 1, when central temperature treatment temp was 440 ℃, when soaking time was 20min, the NiTiV shape memory alloy was non-linear super-elasticity completely, and while memorial alloy super-elasticity reaches maximum value.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732749A (en) * | 2012-07-19 | 2012-10-17 | 镇江忆诺唯记忆合金有限公司 | Middle-temperature treatment process for improving superelasticity of nickel-titanium-vanadium memory alloy |
| CN102787285A (en) * | 2012-08-16 | 2012-11-21 | 北京航空航天大学 | Heat treatment method for obtaining two-way shape memory effect of SMA (Shape Memory Alloy) material |
| CN107427299A (en) * | 2015-03-11 | 2017-12-01 | 扫普莱恩公司 | Improvement in super-elasticity pin |
| CN112027114A (en) * | 2020-09-07 | 2020-12-04 | 西北工业大学 | Unfolding mechanism and pretreatment method of shape memory alloy |
-
2008
- 2008-03-18 CN CNA200810019820XA patent/CN101270460A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732749A (en) * | 2012-07-19 | 2012-10-17 | 镇江忆诺唯记忆合金有限公司 | Middle-temperature treatment process for improving superelasticity of nickel-titanium-vanadium memory alloy |
| CN102787285A (en) * | 2012-08-16 | 2012-11-21 | 北京航空航天大学 | Heat treatment method for obtaining two-way shape memory effect of SMA (Shape Memory Alloy) material |
| CN102787285B (en) * | 2012-08-16 | 2014-02-12 | 北京航空航天大学 | A heat treatment method for obtaining two-way memory effect of SMA material |
| CN107427299A (en) * | 2015-03-11 | 2017-12-01 | 扫普莱恩公司 | Improvement in super-elasticity pin |
| CN112027114A (en) * | 2020-09-07 | 2020-12-04 | 西北工业大学 | Unfolding mechanism and pretreatment method of shape memory alloy |
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