CN111112334A - Preparation method of nickel-titanium shape memory alloy cold-rolled ultrathin sheet - Google Patents
Preparation method of nickel-titanium shape memory alloy cold-rolled ultrathin sheet Download PDFInfo
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- CN111112334A CN111112334A CN202010110770.7A CN202010110770A CN111112334A CN 111112334 A CN111112334 A CN 111112334A CN 202010110770 A CN202010110770 A CN 202010110770A CN 111112334 A CN111112334 A CN 111112334A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0239—Lubricating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0269—Cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B9/00—Measures for carrying out rolling operations under special conditions, e.g. in vacuum or inert atmosphere to prevent oxidation of work; Special measures for removing fumes from rolling mills
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/04—Thickness, gauge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/14—Roughness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
Abstract
The invention relates to a preparation process of a nickel-titanium shape memory alloy cold-rolled ultrathin sheet, which is characterized in that a finishing mill is adopted to carry out cold rolling and finish rolling on the nickel-titanium shape memory alloy with the thickness of 1.0mm to 1.5mm, multiple treatments including solution treatment, cold rolling, finish rolling and post treatment (including annealing treatment and low-temperature aging treatment) are carried out in the cold rolling process, the final size thickness of the cold-rolled material is 0.10mm +/-0.03 mm to 0.30mm +/-0.03 mm, and the width is less than or equal to 300 mm; the nickel element content in the nickel-titanium shape memory alloy ultrathin plate is 48.0 at.% to 52.0 at.%, and the balance is titanium. The material prepared by the method has better two-way shape memory effect and superelasticity, and is more beneficial to realizing phase change under lower heat input because of lower thickness.
Description
The technical field is as follows:
the invention relates to a method for preparing a nickel-titanium shape memory alloy cold-rolled ultrathin plate, which is mainly applied to the manufacture of the shape memory alloy cold-rolled ultrathin plate with the thickness of 0.10mm +/-0.03 mm and the nickel content of 48.0 at.% to 52.0 at.% (the balance being titanium).
Background art:
shape Memory Alloy (SMA) is a smart material that can remember an original Shape and can "remember" or retain the previous Shape when subjected to a specific stimulus, such as a thermal mechanical or magnetic change. In short, shape memory is a particular property, and some materials must recover their original shape after application of a thermal load. The nickel-titanium shape memory alloy has good superelasticity, and meanwhile, the nickel-titanium shape memory alloy is wear-resistant, corrosion-resistant, high-temperature-resistant, non-toxic and environment-friendly, so that the nickel-titanium shape memory alloy is widely applied. The nickel titanium shape memory alloy material has good martensite transformation phenomenon, thereby having excellent two-way shape recovery characteristic. The excellent performance of the nickel-titanium shape memory alloy is mainly caused by the transformation behavior between the parent phase and the martensite phase, and the martensite phase transformation product is more, and generally comprises a B19' phase with a monoclinic structure, a B19 phase with an orthorhombic structure and an R phase with a rhombus structure. Among them, the martensitic transformation between the B2 mother phase and the R phase has low thermal hysteresis and high stability, and is therefore widely used. In recent years, with the rapid development of information technologies represented by 5G technologies, consumers have made higher demands for more flexible and more intelligent products. The nickel-titanium shape memory alloy ultrathin sheet has better application prospect in the design and manufacture of products such as wearable electronic products, high-end intelligent electrical elements, temperature sensing electrical elements, electric driving actuating elements and the like as a new-generation intelligent material.
The nickel-titanium shape memory alloy can produce two-way memory effect, and can be matched with bias spring to make various drivers, for example, alloy spring can be heated to above AfWhen the pressure spring is stretched; cooling to below MfWhen heated, it contracts automatically and then stretches again. The process can be repeated, and the spring displayThe ability to remember the original shape in the cold and hot states, respectively, is obtained. The two-way shape memory effect can be obtained only after a certain training of the alloy, namely, the element made of the memory alloy is heated and cooled repeatedly under the action of external stress. When the alloy is heated and restored to its original shape, it can output force to do work.
The prior art considers that: and (3) after annealing the cold-rolled NiTi alloy sample at different temperatures, measuring the relation between the two-way reversible strain and the annealing temperature when the bending deformation is 8%. When the annealing temperature is lower than 450 ℃, the amount of the two-way reversible strain slightly increases with the increase of the annealing temperature. The annealing temperature is 450-550 ℃, and the two-way reversible strain quantity is obviously increased along with the increase of the annealing temperature. When the annealing temperature exceeds 550 ℃, the temperature continues to rise, and the two-way reversible strain quantity is basically unchanged. The influence of the annealing temperature on the two-way memory effect of the NiTi alloy is related to the difference of dislocation distribution in the parent phase and parent phase strength after the cold-rolled deformation sample is annealed at different temperatures. When the annealing temperature is lower, the dislocation density and the material strength in the parent phase are higher, the stress-induced martensite reorientation is more difficult, and the two-way shape memory effect is poorer. The annealing temperature is increased, the dislocation density in the parent phase is reduced, the parent phase strength is reduced, stress is easily generated to induce the martensite to be reoriented during subsequent deformation, dislocation is introduced, the internal stress field of the sample is changed, and a good two-way shape memory effect is generated.
The prior art does not relate to the preparation of shape memory alloy materials with the thickness of 0.10mm to 0.30mm, especially 0.10 +/-0.03 mm, the nickel content of 48.0 at.% to 52.0 at.% (the balance being titanium), and the nickel-titanium shape memory alloy cold-rolled ultrathin plates with the thickness of 0.10mm +/-0.03 mm are very significant in performance and application.
The invention content is as follows:
the purpose of the invention is as follows: the invention relates to a method for preparing a nickel-titanium shape memory alloy cold-rolled ultrathin plate, which is a shape memory alloy material with the thickness of 0.10mm to 0.30mm, particularly can reach 0.10mm +/-0.03 mm, has the nickel content of 48.0 at.% to 52.0 at.% (the balance being titanium), has better two-way shape memory effect and superelasticity, is more beneficial to realizing phase change under lower heat input because of the ultrathin thickness, and can better meet the requirement of flexible product design due to the superelasticity under lower stress. An alloy is provided which produces good two-way memory effects in nickel titanium alloys.
The invention is implemented by the following technical scheme: a preparation process of a nickel-titanium shape memory alloy cold-rolled ultrathin sheet is characterized by comprising the following steps of: carrying out fine rolling (cold rolling) on the nickel-titanium shape memory alloy with the thickness of 1.0mm to 1.5mm by adopting a fine rolling mill, and carrying out multiple treatments including solution treatment, cold rolling, fine rolling and post treatment (including annealing treatment and low-temperature aging treatment) in an inert atmosphere in the cold rolling process, wherein the final size of the cold-rolled material is 0.1mm in thickness, and the width is less than or equal to 300 mm; the nickel element content in the nickel-titanium shape memory alloy ultrathin plate is 48.0 at.% to 52.0 at.%, and the balance is titanium. The length is not limited.
The preparation process of the nickel-titanium shape memory alloy cold-rolled ultrathin sheet comprises the following steps:
step (1) solution treatment: the nickel-titanium shape memory alloy with the thickness of 1.0mm to 1.5mm is subjected to solution treatment in an inert gas protection heat treatment furnace (99.5 percent to 99.9 percent of high-purity argon, and the pressure is controlled to be between 0.15 and 0.30 Mpa), the temperature is kept at 900 +/-10 ℃ for 90 to 120min, water quenching is carried out, and the initial grain size is controlled to be between 10.0 and 30.0 mu m.
Step (2), cold rolling: carrying out N-pass cold rolling on the nickel-titanium shape memory alloy on a finishing mill, controlling the temperature of the plate to be 10-100 ℃, wherein when the thickness of the plate is 0.7-1.5 mm, the reduction of each pass is 10-15%, and when the thickness of the plate is 0.4-0.7 mm, the reduction of each pass is 5-10%; the annealing treatment temperature is 550-650 ℃, the annealing time is 20-30 min, the annealing treatment is required to be carried out in an inert gas protection heat treatment furnace (99.5-99.9% of high-purity argon, and the pressure is controlled to be 0.15-0.30 MPa), and the grain size is controlled to be 5.0-20.0 μm.
And (3) fine cold rolling: performing N-pass fine cold rolling on the nickel-titanium shape memory alloy on a finishing mill, controlling the temperature of the plate to be 10-40 ℃, and controlling the reduction of each pass to be 3-10%; the low-temperature aging treatment is carried out once when the thickness is reduced by 0.03mm to 0.05mm, the low-temperature aging treatment temperature is 200 ℃ to 250 ℃, the treatment time is 20min to 40min, and the low-temperature aging treatment is carried out in a precise inert gas protection heat treatment furnace (99.9 percent to 99.99 percent of high-purity argon, and the pressure is controlled to be 0.12MPa to 0.20 MPa).
And (4) post-treatment: cutting the nickel-titanium shape memory alloy ultrathin plate after finish rolling, and carrying out low-temperature aging treatment at 210 +/-10 ℃ for 35-40 min, wherein the low-temperature aging treatment is carried out in a precise inert gas protection heat treatment furnace (99.9-99.99% of high-purity argon, the pressure is controlled at 0.12-0.20 Mpa), and the final grain size is controlled at 2.0-5.0 mu m.
And (3) performing the fine cold rolling in the step (3) after the thickness of the cold-rolled sheet in the step (2) is less than 0.4 mm.
Before cold rolling, the surface of the nickel-titanium shape memory alloy is subjected to mechanical polishing and ultrasonic surface cleaning, the surface roughness is controlled to Ra0.8-1.6 mu m, and the surface finish is controlled to Ra0.63-1.25 mu m; polishing a roller of a cold rolling mill until the surface roughness is Ra0.8-1.6 mu m, controlling the surface smoothness to be Ra0.63-1.25 mu m, and uniformly coating rolling oil after cleaning the surface; before the finish cold rolling, the roll of the finish cold machine is polished to Ra0.2-0.4 μm, the surface finish is controlled to Ra0.16-0.32 μm, and rolling oil is uniformly coated after the surface is cleaned.
In the preparation process of the nickel-titanium shape memory alloy cold-rolled ultrathin sheet, the temperature and the treatment time of the low-temperature aging treatment in the step (3) are in the following corresponding relationship: when the thickness of the plate is 0.40mm plus or minus 0.05mm, the temperature is 240 plus or minus 10 ℃, and the time is 20min to 25 min; when the thickness of the plate is 0.30mm plus or minus 0.05mm, the temperature is 230 plus or minus 10 ℃, and the time is 25min to 30 min; when the thickness of the plate is 0.20mm plus or minus 0.05mm, the temperature is 220 plus or minus 10 ℃, and the time is 30min to 35 min; when the thickness of the plate is 0.10mm +/-0.05 mm, the temperature is 210 +/-10 ℃, and the time is 35-40 min.
Has the advantages that: the invention relates to a preparation process of a nickel-titanium shape memory alloy cold-rolled ultrathin sheet, which has the following three remarkable advantages:
the thickness of the nickel-titanium shape memory alloy ultrathin sheet prepared by the process can reach 0.10mm to 0.30mm, particularly can reach 0.10mm +/-0.03 mm, and meanwhile, the nickel-titanium shape memory alloy ultrathin sheet can ensure that the material has higher mechanical property, good two-way shape memory performance and superelasticity. Meanwhile, the ultra-thin thickness is more beneficial to realizing phase change under lower heat input, and the ultra-elasticity under lower stress enables the flexible heat-conducting plate to better meet the requirement of flexible product design. The microstructure of the nickel-titanium shape memory alloy ultrathin plate prepared by the process has uniform and moderate grain size and can inhibit Ti3Ni4And the formation of brittle intermetallic phases. The nickel-titanium shape memory alloy ultrathin sheet prepared by the process can well control the rolling stress generated in the cold rolling process and overcome the rolling cracking caused by work hardening.
The specific implementation mode is as follows:
the present invention will be described in detail with reference to the following specific examples:
before cold rolling, the surface of the nickel-titanium shape memory alloy with the thickness of 1.2mm, the length of 1500mm and the width of 200mm is subjected to mechanical polishing and ultrasonic surface cleaning, the surface roughness is controlled to Ra0.8 mu m to 1.6 mu m, and the surface smoothness is controlled to Ra0.63 mu m to 1.25 mu m; polishing the roller of a cold rolling mill until the surface roughness is Ra0.8-1.6 mu m, controlling the surface smoothness to be Ra0.63-1.25 mu m, and uniformly coating rolling oil after cleaning the surface.
The material is subjected to solution treatment in an inert gas protection heat treatment furnace (99.5-99.9% high-purity argon, and the pressure is controlled under 0.20 Mpa), the temperature is 900 +/-10 ℃, the temperature is kept for 120min, and after water quenching, the initial grain size of the material is observed to be between 15.0 and 25.0 mu m by adopting an optical microscope.
The first cold rolling is carried out, the thickness is 1.02mm, the annealing temperature is 650 +/-10 ℃, and the heat preservation time is 25 min;
performing cold rolling for the second time, wherein the thickness is 0.90mm, the annealing temperature is 640 +/-10 ℃, and the heat preservation time is 25 min;
cold rolling for the third time, wherein the thickness is 0.80mm, the annealing temperature is 630 +/-10 ℃, and the heat preservation time is 25 min;
and (3) cold rolling for the fourth time, wherein the thickness is 0.70mm, the annealing temperature is 620 +/-10 ℃, and the heat preservation time is 25 min.
Annealing treatment is carried out in an inert gas protection heat treatment furnace (99.5-99.9% high-purity argon gas, pressure is controlled at 0.20 Mpa), when the thickness is 0.70mm, the grain size of the material is observed to be 10.0-20.0 μm by an optical microscope.
Performing cold rolling for the fifth time, wherein the thickness is 0.63mm, the annealing temperature is 610 +/-10 ℃, and the heat preservation time is 25 min;
performing cold rolling for the sixth time, wherein the thickness is 0.57mm, the annealing temperature is 600 +/-10 ℃, and the heat preservation time is 25 min;
performing cold rolling for the seventh time, wherein the thickness is 0.52mm, the annealing temperature is 590 +/-10 ℃, and the heat preservation time is 25 min;
performing cold rolling for the eighth time, wherein the thickness is 0.47mm, the annealing temperature is 580 +/-10 ℃, and the heat preservation time is 25 min;
performing cold rolling for the ninth time, wherein the thickness is 0.43mm, the annealing temperature is 570 +/-10 ℃, and the heat preservation time is 25 min;
cold rolling for the tenth time, wherein the thickness is 0.40mm, the annealing temperature is 560 +/-10 ℃, and the heat preservation time is 25 min;
annealing treatment in an inert gas protective heat treatment furnace (99.5-99.9% high purity argon gas, pressure controlled at 0.20 Mpa) at a thickness of 0.40mm, and observing the initial grain size of the material between 5.0 μm and 12.0 μm by using an optical microscope.
Before the finish cold rolling, the roller of the finish cold rolling machine is polished to Ra0.2-0.4 μm, the surface finish degree is controlled to Ra0.16-0.32 μm, and rolling oil is uniformly coated after the surface is cleaned. When in fine cold rolling, the rotating speed of the roller is reduced, and the temperature of the roller is strictly controlled to be 10-40 ℃.
Performing primary fine cold rolling to obtain a product with the thickness of 0.37 mm;
performing secondary fine cold rolling with the thickness of 0.33mm, and performing low-temperature aging treatment at 240 +/-10 ℃ for 20 min;
performing cold refining at thickness of 0.30mm for the third time, and performing low-temperature aging treatment at 230 +/-10 ℃ for 25 min;
performing fine cold rolling for the fourth time, wherein the thickness is 0.28 mm;
performing cold refining at thickness of 0.26mm, performing low-temperature aging treatment at 230 +/-10 ℃, and keeping the temperature for 30 min;
performing fine cold rolling for the sixth time, wherein the thickness is 0.24 mm;
performing fine cold rolling for the seventh time, wherein the thickness is 0.22 mm;
performing cold refining at a thickness of 0.20mm for the eighth time, and performing low-temperature aging treatment at 220 +/-10 ℃ for 30 min;
performing ninth fine cold rolling to obtain a product with the thickness of 0.18 mm;
performing fine cold rolling for the tenth time, wherein the thickness is 0.16mm, performing low-temperature aging treatment at 220 +/-10 ℃, and keeping the temperature for 35 min;
performing fine cold rolling for the eleventh time, wherein the thickness is 0.14 mm;
performing fine cold rolling for the twelfth time, wherein the thickness is 0.13 mm;
performing cold rolling for the thirteenth time, wherein the thickness is 0.12mm, performing low-temperature aging treatment at 210 +/-10 ℃, and keeping the temperature for 35 min;
performing cold refining for the fourteenth time, wherein the thickness is 0.11 mm;
performing finish cold rolling for the fifteenth time, wherein the thickness is 0.10 mm;
cutting the nickel-titanium shape memory alloy ultrathin plate after finish rolling, and carrying out low-temperature aging treatment at 210 +/-10 ℃ for 40 min.
The low-temperature aging treatment is carried out in a precise inert gas protection heat treatment furnace (99.9-99.99% high-purity argon, and the pressure is controlled at 0.15 Mpa), and when the thickness is 0.10mm, the grain size of the material is observed to be between 2.0 and 5.0 mu m by using an optical microscope.
The tensile strength of the nickel-titanium shape memory alloy ultrathin sheet with the thickness of 0.10mm at room temperature is 1067Mpa, and the nickel-titanium shape memory alloy ultrathin sheet has good recoverable strain under the strain amplitude of 6.0 percent and has good performanceGood two-way shape memory effect. The grain size of the microstructure of the material is between 2.0 and 5.0 mu m, and Ti is not seen3Ni4And the like, and brittle intermetallic phases are generated. The material has no obvious cracking caused by stress concentration in the cold rolling process, and has no macroscopic defects caused by any stress concentration in subsequent detection.
Claims (5)
1. A preparation process of a nickel-titanium shape memory alloy cold-rolled ultrathin sheet is characterized by comprising the following steps of: cold rolling and finish rolling are carried out on the nickel-titanium shape memory alloy with the thickness of 1.0mm to 1.5mm by adopting a finish rolling mill, solution treatment, cold rolling, finish rolling and post treatment including annealing treatment and low-temperature aging treatment are carried out in the cold rolling process, the final size thickness of the cold-rolled material is 0.10mm +/-0.03 mm to 0.30mm +/-0.03 mm, and the width is less than or equal to 300 mm; the nickel element content in the nickel-titanium shape memory alloy ultrathin plate is 48.0 at.% to 52.0 at.%, and the balance is titanium.
2. The process for preparing the nickel titanium shape memory alloy cold-rolled ultrathin sheet material according to claim 1 is characterized in that: the finish rolling process comprises the following steps:
step (1) solution treatment: carrying out solution treatment on the nickel-titanium shape memory alloy with the thickness of 1.0mm to 1.5mm in an inert gas protection heat treatment furnace under the pressure of 99.5 percent to 99.9 percent of high-purity argon and the pressure of 0.15MPa to 0.30MPa, keeping the temperature at 900 +/-10 ℃ for 90min to 120min, carrying out water quenching, and controlling the initial grain size to be 10.0 mu m to 30.0 mu m;
step (2), cold rolling: carrying out N-pass cold rolling on the nickel-titanium shape memory alloy on a finishing mill, controlling the temperature of the plate to be 10-100 ℃, wherein when the thickness of the plate is 0.7-1.5 mm, the reduction of each pass is 10-15%, and when the thickness of the plate is 0.4-0.7 mm, the reduction of each pass is 5-10%; the annealing treatment temperature is 550-650 ℃, the annealing time is 20-30 min, the annealing treatment is carried out in an inert gas protection heat treatment furnace under the conditions of 99.5-99.9% of high-purity argon and 0.15-0.30 MPa of pressure, and the grain size is controlled to be 5.0-20.0 mu m;
and (3) fine cold rolling: performing N-pass fine cold rolling on the nickel-titanium shape memory alloy on a finishing mill, controlling the temperature of the plate to be 10-40 ℃, and controlling the reduction of each pass to be 3-10%; carrying out low-temperature aging treatment once when the thickness is reduced by 0.03mm to 0.05mm, wherein the low-temperature aging treatment temperature is 200 ℃ to 250 ℃, the treatment time is 20min to 40min, the low-temperature aging treatment is carried out in a relatively precise inert gas protection heat treatment furnace, 99.9 percent to 99.99 percent of high-purity argon, and the pressure is controlled to be 0.12MPa to 0.20 MPa;
and (4) post-treatment: cutting the nickel-titanium shape memory alloy ultrathin plate after finish rolling, and carrying out low-temperature aging treatment at 210 +/-10 ℃, wherein the treatment time is 35-40 min, the low-temperature aging treatment is carried out in a relatively precise inert gas protection heat treatment furnace under the conditions that 99.9-99.99% of high-purity argon is used, the pressure is controlled to be 0.12-0.20 Mpa, and the final grain size is controlled to be 2.0-5.0 mu m.
3. The process for preparing the nickel titanium shape memory alloy cold-rolled ultrathin sheet material according to claim 2 is characterized in that: and (3) performing the fine cold rolling in the step (3) after the thickness of the cold-rolled sheet in the step (2) is less than 0.4 mm.
4. A process for preparing a nickel titanium shape memory alloy cold rolled ultra thin sheet according to any one of claims 1 to 3, characterized in that: before cold rolling, the surface of the nickel-titanium shape memory alloy is subjected to mechanical polishing and ultrasonic surface cleaning, the surface roughness is controlled to Ra0.8-1.6 mu m, and the surface finish is controlled to Ra0.63-1.25 mu m; polishing a roller of a cold rolling mill until the surface roughness is Ra0.8-1.6 mu m, controlling the surface smoothness to be Ra0.63-1.25 mu m, and uniformly coating rolling oil after cleaning the surface; before the finish cold rolling, the roll of the finish cold machine is polished to Ra0.2-0.4 μm, the surface finish is controlled to Ra0.16-0.32 μm, and rolling oil is uniformly coated after the surface is cleaned.
5. A process for preparing a nickel titanium shape memory alloy cold rolled ultra thin sheet according to any one of claims 1 to 3, characterized in that: the temperature and the treatment time of the low-temperature aging treatment in the step (3) should follow the following corresponding relationship: when the thickness of the plate is 0.40mm plus or minus 0.05mm, the temperature is 240 plus or minus 10 ℃, and the time is 20min to 25 min; when the thickness of the plate is 0.30mm plus or minus 0.05mm, the temperature is 230 plus or minus 10 ℃, and the time is 25min to 30 min; when the thickness of the plate is 0.20mm plus or minus 0.05mm, the temperature is 220 plus or minus 10 ℃, and the time is 30min to 35 min; when the thickness of the plate is 0.10mm +/-0.05 mm, the temperature is 210 +/-10 ℃, and the time is 35-40 min.
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| CN113481443A (en) * | 2021-06-18 | 2021-10-08 | 武汉大学 | Method for preparing metal material with adjustable deformation and checking device |
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