CN102251200A - Method for improving compressive plasticity of Ni-Ti shape memory alloy by sheathing way - Google Patents
Method for improving compressive plasticity of Ni-Ti shape memory alloy by sheathing way Download PDFInfo
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- CN102251200A CN102251200A CN 201110138314 CN201110138314A CN102251200A CN 102251200 A CN102251200 A CN 102251200A CN 201110138314 CN201110138314 CN 201110138314 CN 201110138314 A CN201110138314 A CN 201110138314A CN 102251200 A CN102251200 A CN 102251200A
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- memorial alloy
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- shaped memorial
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Abstract
The invention provides a method for improving compressive plasticity of a Ni-Ti shape memory alloy by a sheathing way. The method comprises the steps of: processing a Ni-Ti shape memory alloy block into a cylinder with certain diameter and height, assembling the cylinder into a processed metal sheath in an interference fitting manner, placing the assembled Ni-Ti shape memory alloy and the metal sheath between an upper press plate and a lower press plate of a press machine for compressing and deforming until a required deformation is obtained, and separating the formed Ni-Ti shape memory alloy from a sheathing material by means of the superelasticity or shape memory effect of the Ni-Ti shape memory alloy. According to the invention, by choosing the Ni-Ti shape memory alloy cold plastic deformation as an entry point and adopting a sheathing manner, the Ni-Ti shape memory alloy is always in a three-directional compressing stress state in the compressive deformation process; and therefore, the plasticity of the Ni-Ti shape memory alloy is enhanced, the severe plastic deformation of the Ni-Ti shape memory alloy is realized, the microscopic structure of the Ni-Ti shape memory alloy is improved, and the mechanical property of the Ni-Ti shape memory alloy is enhanced.
Description
Technical field
What the present invention relates to is a kind of remodeling treatment process of niti-shaped memorial alloy.The specifically a kind of compression plasticity of niti-shaped memorial alloy and method of cold plastic deformation ability of improving.
Background technology
Niti-shaped memorial alloy has obtained in engineering fields such as biomedicines using widely because have shape memory effect, super-elasticity, solidity to corrosion and excellent biological compatibility.Plastic working is to make niti-shaped memorial alloy move towards the important technical links that engineering is used, because plastic working not only can produce the niti-shaped memorial alloy product, and can significantly improve the microstructure of niti-shaped memorial alloy, improve the mechanical property of niti-shaped memorial alloy, especially when the cold plasticity of niti-shaped memorial alloy is shaped, can in alloy, form high density dislocation, thereby significantly improve the super-elasticity of niti-shaped memorial alloy.Yet, niti-shaped memorial alloy under the cold plastic deformation condition, the resistance to deformation height, plasticity is lower, sclerosis comparatively fast can reduce the cracking that very easily deforms rapidly because of plasticity, and cold plastic deformation is to improve the necessary link of Ultraelasticity of Ni Ti Shape Remembrance Alloy under the large plastometric set condition.Therefore, realize the aximal deformation value of nickel-titanium shape memory under cold plastic deformation, be the technical bottleneck that engineering technical personnel are difficult to overcome always.
Summary of the invention
The object of the present invention is to provide a kind of plasticity that can improve niti-shaped memorial alloy, realize the large plastometric set of niti-shaped memorial alloy, improve the microstructure of niti-shaped memorial alloy, the employing jacket mode that improves the mechanical property of niti-shaped memorial alloy improves the method for niti-shaped memorial alloy compression plasticity.
The object of the present invention is achieved like this:
The block niti-shaped memorial alloy is processed into the cylinder that necessarily has diameter and height, mode with shrink-fit is assembled in the manufactured metallic sheath again, carry out compression set between last chopping block that the niti-shaped memorial alloy that assembles and metallic sheath are placed on pressing machine and the following chopping block then, after be pressed onto required deflection, shaping finishes, it is separated with sheath material by the super-elasticity or the shape memory effect of niti-shaped memorial alloy.
Height after the height of described metallic sheath will compress less than niti-shaped memorial alloy, and assembling finish after metallic sheath be positioned at the mid-way of niti-shaped memorial alloy.
The height of described metallic sheath is identical with the height of niti-shaped memorial alloy.
The height of described metallic sheath is greater than the height of niti-shaped memorial alloy, and assembling finish after niti-shaped memorial alloy be positioned at the mid-way of metallic sheath, the two ends of metallic sheath are blocked with the metal plug.
The employing jacket form that the present invention proposes improves niti-shaped memorial alloy compression plasticity method can be divided into local jacket compression, the compression of open type jacket and three kinds of forms of enclosed jacket compression.Niti-shaped memorial alloy is placed the jacket metallic substance, by selecting suitable jacket metallic substance, wrapping structure reasonable in design, suitable friction condition is set, can control the flowing law of jacket metal in the niti-shaped memorial alloy jacket compression set process effectively, make niti-shaped memorial alloy be in stronger three-dimensional compressive stress state, thereby improve the plasticity of niti-shaped memorial alloy, realize the niti-shaped memorial alloy large plastometric set.Local jacket compression, the compression of open type jacket and the compression of enclosed jacket respectively have its characteristics: local jacket compression can make up and down chopping block and be in good lubricating status with niti-shaped memorial alloy, compression set can not take place in jacket in compression process, but radially and tangentially viscous deformation can take place, make niti-shaped memorial alloy be in the three-dimensional compressive stress state all the time; Viscous deformation takes place in metal jacket and niti-shaped memorial alloy simultaneously in the open type jacket compression process, make up and down chopping block and niti-shaped memorial alloy, be in different friction conditions between chopping block and the metal jacket up and down, because there is the metal flow neutral line in distortion initial stage metal jacket, metal can be that the line of delimitation divides other to flow to endoporus and outer wall place with the neutral line, thereby niti-shaped memorial alloy is in the three-dimensional compressive stress state all the time in compression process; The characteristics of enclosed jacket compression are to make niti-shaped memorial alloy be in main distorted area state fully in compression process, have avoided existing the problem in distortion dead band.
The advantage of method of the present invention is:
1. this method only needs simple mould can realize the compression set of niti-shaped memorial alloy block materials on common hydropress.
2. niti-shaped memorial alloy is in the jacket compression process, and niti-shaped memorial alloy is in the state of three-dimensional compressive stress all the time, can significantly improve the plasticity of niti-shaped memorial alloy, realizes the bigger cold plastic deformation of niti-shaped memorial alloy.
3. during cold plastic deformation, when niti-shaped memorial alloy is in austenitic state, utilize the super-elasticity behavior of niti-shaped memorial alloy stress-induced martensite phase transformation, can realize separating of niti-shaped memorial alloy and jacket metallic substance at an easy rate; When niti-shaped memorial alloy is in martensitic state, utilize the shape memory effect of niti-shaped memorial alloy, also can realize at an easy rate separating of niti-shaped memorial alloy and jacket metallic substance by heating.
4. with niti-shaped memorial alloy jacket sample bigger in the actual production, dwindle certain ratio, on INSTRON universal material testing machine for mechanical properties, carry out compression testing, can effectively analyze the metal flow rule, calculate deformation force, save production cost greatly.
5. present method deformation extent required according to niti-shaped memorial alloy in the actual production can adopt different jacket forms, and be convenient, flexible, saves cost.
Description of drawings
Fig. 1 is local jacket compression niti-shaped memorial alloy jacket compression basic principle schematic;
Fig. 2 is an open type jacket compression niti-shaped memorial alloy jacket compression basic principle schematic;
Fig. 3 is an enclosed jacket compression niti-shaped memorial alloy jacket compression basic principle schematic.
Embodiment
For example the present invention is done more detailed description below in conjunction with accompanying drawing:
Local jacket compression: in conjunction with Fig. 1, block niti-shaped memorial alloy 3 is processed into cylinder with certain diameter and height, mode with shrink-fit is assembled in the manufactured metallic sheath 4 again, guarantee that metallic sheath 4 is positioned at the mid-way of niti-shaped memorial alloy 3, and the height of the height of metallic sheath 4 after will compressing less than niti-shaped memorial alloy 3.Then the material that assembles is placed between the last chopping block 1 of pressing machine and the following chopping block 5 and carries out compression set, until being pressed onto required deflection.Super-elasticity or shape memory effect by niti-shaped memorial alloy after shaping finishes are separated it with sheath material.Practice test proves that degree of the compressed distortion is at 50% o'clock, and material is not found any macrocrack yet, and sheath material is not pressed onto at 28% o'clock and promptly shear fracture may takes place.
Open type jacket compression: in conjunction with Fig. 2, block niti-shaped memorial alloy 3 is processed into cylinder with certain diameter and height, mode with shrink-fit is assembled in the manufactured metallic sheath 4 again, guarantees that metallic sheath 4 is identical with the height of niti-shaped memorial alloy 3.Then the material that assembles is placed between the last chopping block 1 of pressing machine and the following chopping block 5 and carries out compression set, until being pressed onto required deflection.Because there is metal flow neutral line 6 in distortion initial stage metal jacket 4, metal can be to flow to endoporus and outer wall place respectively in the line of delimitation with the neutral line.Super-elasticity or shape memory effect by niti-shaped memorial alloy after shaping finishes are separated it with sheath material.Practice test proves that degree of the compressed distortion is at 75% o'clock, and the niti-shaped memorial alloy sample ruptures, and side surface has than checking, but after removing the top layer metal, microstructure observation shows that middle main distorted area is all intact.
Enclosed jacket compression: in conjunction with Fig. 3, block niti-shaped memorial alloy 3 is processed into the cylinder that necessarily has diameter and height, again its mode with shrink-fit is put in the manufactured metallic sheath 4, guarantee the height of the height of metallic sheath 4 greater than niti-shaped memorial alloy 3, and make niti-shaped memorial alloy be positioned at the mid-way of metallic sheath 4, then the two ends of metallic sheath 4 are blocked with two metal plugs 2.At last the material that assembles is placed between the last chopping block 1 of pressing machine and the following chopping block 5 and carries out compression set, until being pressed onto required deflection.Super-elasticity or shape memory effect by niti-shaped memorial alloy after shaping finishes are separated it with sheath material.
Claims (4)
1. method that adopts the jacket mode to improve the niti-shaped memorial alloy compression plasticity, it is characterized in that: the block niti-shaped memorial alloy is processed into the cylinder that necessarily has diameter and height, mode with shrink-fit is assembled in the manufactured metallic sheath again, carry out compression set between last chopping block that the niti-shaped memorial alloy that assembles and metallic sheath are placed on pressing machine and the following chopping block then, after be pressed onto required deflection, shaping finishes, it is separated with sheath material by the super-elasticity or the shape memory effect of niti-shaped memorial alloy.
2. employing jacket mode according to claim 1 improves the method for niti-shaped memorial alloy compression plasticity, it is characterized in that: the height after the height of described metallic sheath will compress less than niti-shaped memorial alloy, and assembling finish after metallic sheath be positioned at the mid-way of niti-shaped memorial alloy.
3. employing jacket mode according to claim 1 improves the method for niti-shaped memorial alloy compression plasticity, it is characterized in that: the height of described metallic sheath is identical with the height of niti-shaped memorial alloy.
4. employing jacket mode according to claim 1 improves the method for niti-shaped memorial alloy compression plasticity, it is characterized in that: the height of described metallic sheath is greater than the height of niti-shaped memorial alloy, and niti-shaped memorial alloy was positioned at the mid-way of metallic sheath after assembling was finished, and the two ends of metallic sheath are blocked with the metal plug.
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| CN 201110138314 CN102251200A (en) | 2011-05-26 | 2011-05-26 | Method for improving compressive plasticity of Ni-Ti shape memory alloy by sheathing way |
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| CN 201110138314 CN102251200A (en) | 2011-05-26 | 2011-05-26 | Method for improving compressive plasticity of Ni-Ti shape memory alloy by sheathing way |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104999085A (en) * | 2015-07-02 | 2015-10-28 | 哈尔滨工程大学 | Preparation method of nanosheet layer phase reinforced TiNi-based alloy composite plate |
| CN108715986A (en) * | 2018-06-26 | 2018-10-30 | 哈尔滨工程大学 | A method of improving austenitic Ti-based shape memory alloy temperature-room type plasticity by adjusting texture |
| CN108788437A (en) * | 2018-06-08 | 2018-11-13 | 哈尔滨工程大学 | Xenogenesis Ni-Ti-based shape memory alloy spreads welding connection method |
| CN111468553A (en) * | 2020-04-08 | 2020-07-31 | 重庆理工大学 | Nickel-titanium shape memory alloy plate with gradient grain structure |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101733304A (en) * | 2008-11-25 | 2010-06-16 | 北京有色金属研究总院 | TiNi base shape memory alloy tube hydraulic extrusion moulding method |
-
2011
- 2011-05-26 CN CN 201110138314 patent/CN102251200A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101733304A (en) * | 2008-11-25 | 2010-06-16 | 北京有色金属研究总院 | TiNi base shape memory alloy tube hydraulic extrusion moulding method |
Non-Patent Citations (1)
| Title |
|---|
| 《稀有金属》 20070430 黄劲松等 TiAl合金的热压缩模拟 第154-159页 1-4 第31卷, 第2期 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104999085A (en) * | 2015-07-02 | 2015-10-28 | 哈尔滨工程大学 | Preparation method of nanosheet layer phase reinforced TiNi-based alloy composite plate |
| CN108788437A (en) * | 2018-06-08 | 2018-11-13 | 哈尔滨工程大学 | Xenogenesis Ni-Ti-based shape memory alloy spreads welding connection method |
| CN108715986A (en) * | 2018-06-26 | 2018-10-30 | 哈尔滨工程大学 | A method of improving austenitic Ti-based shape memory alloy temperature-room type plasticity by adjusting texture |
| CN111468553A (en) * | 2020-04-08 | 2020-07-31 | 重庆理工大学 | Nickel-titanium shape memory alloy plate with gradient grain structure |
| CN111468553B (en) * | 2020-04-08 | 2021-04-20 | 重庆理工大学 | Nickel-titanium shape memory alloy plate with gradient grain structure |
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Application publication date: 20111123 |