Preparation method of titanium-aluminum composite strip coil
By introducing nickel strip as an intermediate layer into the titanium-aluminum composite strip, and through steps such as coiling, rolling, and annealing, the problem of insufficient titanium-aluminum bonding strength was solved, thereby improving the mechanical properties and application range of the composite strip.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HENAN ZHONGYUAN TITANIUM IND CO LTD
- Filing Date
- 2025-12-30
- Publication Date
- 2026-04-21
AI Technical Summary
Existing titanium-aluminum composite strip coils suffer from insufficient bonding strength due to differences in physicochemical properties during the rolling process, which easily leads to the formation of brittle intermetallic compounds, thus limiting their performance improvement and high-end applications.
Using nickel strip as an intermediate transition layer, titanium-aluminum composite strip is prepared through steps such as winding, rolling, and annealing. Titanium nanolayers, aluminum nanolayers, or copper composite layers are set to promote interfacial bonding. The compatibility of nickel strip is used to form a stable interface and avoid the formation of brittle compounds.
It improves the bonding strength of titanium-aluminum composite strip coils, suppresses interlayer cracking, expands its application range, and enhances mechanical properties.
Smart Images
Figure CN121892503A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of titanium alloy rolling technology, and specifically to a method for preparing titanium-aluminum composite strip coils. Background Technology
[0002] Titanium-aluminum composite strip coils combine the excellent properties of both titanium and aluminum alloys. They possess the high strength, corrosion resistance, and high-temperature performance of titanium alloys, while also exhibiting the lightweight, good electrical and thermal conductivity, and ease of processing of aluminum alloys. Therefore, they have broad application prospects in aerospace, automotive manufacturing, electronics, and chemical industries. Currently, rolling composite is the most widely used production method for titanium-aluminum composite strip coils. The rolling composite method involves stacking dissimilar metal plates into a blank and then feeding it into the roll gap of a rolling mill for rolling. This method has advantages such as simple process, high production efficiency, low cost, and suitability for mass production.
[0003] Although the rolling composite method offers numerous advantages in the production of titanium-aluminum composite strip coils, several problems remain to be solved in practical applications. The most prominent issue is insufficient bonding strength between titanium and aluminum. Due to the significant differences in the physicochemical properties of titanium and aluminum, brittle intermetallic compounds easily form at the interface during rolling. The presence of these compounds reduces the bonding strength of the composite strip coil. This not only limits further performance improvements in titanium-aluminum composite strip coils but also, to some extent, hinders their application in high-end fields. Therefore, improving the bonding strength of titanium-aluminum composite strip coils is a pressing technical challenge that needs to be addressed in this field. Summary of the Invention
[0004] The purpose of this invention is to overcome the defects in the prior art and provide a method for preparing titanium-aluminum composite strip rolls.
[0005] To achieve the above objectives, the technical solution of the present invention is as follows: A method for preparing titanium-aluminum composite strip coil, comprising the following steps: Titanium strip coils, nickel strip coils, and aluminum strip coils are pickled and degreased. The processed titanium strip coil and the nickel strip coil are combined using a coiling machine to obtain a combined coil, which is then composite-rolled with the aluminum strip coil to prepare a composite coil blank; or the processed aluminum strip coil and the nickel strip coil are combined using a coiling machine to obtain a combined coil, which is then composite-rolled with the titanium strip coil to prepare a composite coil blank; the titanium strip coil, the nickel strip coil, and the aluminum strip coil are stacked sequentially to form the composite coil blank; The composite coil is rolled; The composite roll blank is annealed to prepare titanium-aluminum composite strip roll.
[0006] According to the embodiment of the present invention, the method for preparing titanium-aluminum composite strip coils, after the steps of pickling and degreasing the titanium strip coil, nickel strip coil, and aluminum strip coil, further includes: forming a titanium nanolayer on the side of the nickel strip coil facing the titanium strip coil by magnetron sputtering, and forming an aluminum nanolayer on the side of the nickel strip coil facing the aluminum strip coil by magnetron sputtering.
[0007] According to the preparation method of titanium-aluminum composite tape provided in the embodiments of the present invention, the thickness of both the titanium nanolayer and the aluminum nanolayer is 50-100 nm.
[0008] According to the embodiment of the present invention, the method for preparing titanium-aluminum composite strip coils includes, after the steps of pickling and degreasing titanium strip coils, nickel strip coils and aluminum strip coils, the method further includes: forming a titanium nanolayer on the side of the nickel strip coil facing the titanium strip coil by magnetron sputtering, and forming a copper composite layer on the side of the nickel strip coil facing the aluminum strip coil by electroplating.
[0009] According to the preparation method of titanium-aluminum composite tape provided in the embodiments of the present invention, the thickness of the titanium nanolayer is 50-100 nm, and the thickness of the copper composite layer is 8-12 μm.
[0010] According to the method for preparing titanium-aluminum composite strip coil provided in the embodiments of the present invention, the steps of composite rolling the composite coil with the aluminum strip coil, or composite rolling the composite coil with the titanium strip coil, include: Composite rolling is performed at room temperature using a four-roll mill, with a reduction of 20%-30%, a rolling speed of 2-3 m / min, a titanium side tension of 50-60 MPa, and an aluminum side tension of 30-40 MPa.
[0011] According to the method for preparing titanium-aluminum composite strip coil provided in the embodiments of the present invention, the step of rolling the composite coil blank includes: The composite coil is heated, with the temperature of one side of the titanium strip coil heated to 450-500℃ and the temperature of one side of the aluminum strip coil heated to 200-250℃, and hot rolled in 2-3 passes, with a single pass reduction of 40%-50% and a total reduction of 70%-80%.
[0012] According to the method for preparing titanium-aluminum composite strip coil provided in the embodiments of the present invention, the step of annealing the composite coil blank includes: The composite roll is subjected to two annealing processes. The first annealing is performed at a temperature of 450-500℃ for 30-60 minutes under an argon protective atmosphere. The second annealing is performed under vacuum at a temperature of 350-400℃ for 15-30 minutes.
[0013] According to the preparation method of titanium-aluminum composite strip coil provided in the embodiments of the present invention, the titanium strip coil is one of TA1, TA2, TA4, TC4, the aluminum strip coil is one of 6061, 7075, 5052, and the nickel strip coil has a purity ≥99.9%.
[0014] According to the method for preparing titanium-aluminum composite strip coil provided in the embodiments of the present invention, after the step of annealing the composite coil blank, the method further includes: The composite roll is then straightened and trimmed.
[0015] The advantages and beneficial effects of this invention are as follows: The method for preparing titanium-aluminum composite strip coils provided in this application involves sequentially stacking titanium strip coils, nickel strip coils, and aluminum strip coils to form a composite coil blank, followed by rolling and annealing to produce the titanium-aluminum composite strip coil. Since nickel strip coils are well compatible with both titanium and aluminum strip coils, forming a stable interface, a nickel strip coil is placed between the titanium and aluminum strip coils as an intermediate transition layer, allowing the nickel strip coil to bond with both titanium and aluminum during the rolling process. This effectively solves the problem of insufficient bonding strength caused by differences in physicochemical properties when titanium and aluminum are directly composited. Furthermore, it avoids the formation of brittle intermetallic compounds during direct titanium-aluminum composite bonding, inhibiting interlayer cracking in the titanium-aluminum composite strip coil. Therefore, by placing a nickel strip coil as an intermediate transition layer between the titanium and aluminum strip coils, the mechanical properties of the titanium-aluminum composite strip coil are improved, expanding its application range. Attached Figure Description
[0016] Figure 1 This is a schematic flowchart of the preparation method of titanium-aluminum composite strip roll in an embodiment of the present invention; Figure 2 This is a schematic diagram of winding by a winding machine in an embodiment of the present invention; Figure 3 This is a schematic diagram of composite rolling in an embodiment of the present invention; Figure 4 This is a schematic diagram of the titanium-aluminum composite strip roll in an embodiment of the present invention.
[0017] 1. Composite coil; 2. Aluminum strip coil; 3. Four-roll mill; 4. Composite coil blank; 5. Heating furnace; 6. Annealing furnace; 7. Twenty-roll mill; 8. Titanium-aluminum composite strip coil; 81. Aluminum coil layer; 82. Copper composite layer; 83. Nickel coil layer; 84. Titanium nanolayer; 85. Titanium coil layer; 9. Turning roller. Detailed Implementation
[0018] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.
[0019] Figure 1 This is a schematic flowchart of the preparation method of titanium-aluminum composite strip roll in an embodiment of the present invention. Figure 2 This is a schematic diagram illustrating the winding process using a winding machine in an embodiment of the present invention. Figure 3 This is a schematic diagram of composite rolling in an embodiment of the present invention, as shown below. Figures 1 to 3 As shown, this application provides a method for preparing titanium-aluminum composite strip coils, comprising the following steps: S1: Pickling and degreasing treatment of titanium strip coil, nickel strip coil and aluminum strip coil 2; S2: The processed titanium strip coil and nickel strip coil are coiled together by a coiling machine to obtain a combined coil 1. The combined coil 1 is then combined with aluminum strip coil 2 for composite rolling to prepare a composite coil blank 4; or the processed aluminum strip coil 2 and nickel strip coil are coiled together by a coiling machine to obtain a combined coil 1. The combined coil 1 is then combined with titanium strip coil for composite rolling to prepare a composite coil blank 4; the titanium strip coil, nickel strip coil and aluminum strip coil 2 are stacked in sequence to form the composite coil blank 4; S3: Roll the composite coil 4; S4: Anneal the composite coil 4 to prepare titanium-aluminum composite strip coil 8.
[0020] The method for preparing titanium-aluminum composite strip coil 8 provided in this application involves stacking titanium strip coil, nickel strip coil, and aluminum strip coil 2 sequentially to form a composite coil blank 4, and then rolling and annealing the composite coil blank 4 to prepare the titanium-aluminum composite strip coil 8. Since the nickel strip coil is well compatible with both the titanium and aluminum strip coils, forming a stable interface, a nickel strip coil is placed between the titanium and aluminum strip coils as an intermediate transition layer, allowing the nickel strip coil to bond with the titanium and aluminum during the rolling process. This effectively solves the problem of insufficient bonding strength caused by differences in physicochemical properties when titanium and aluminum are directly composited. Furthermore, it avoids the formation of brittle intermetallic compounds during direct titanium-aluminum composite bonding, inhibiting interlayer cracking in the titanium-aluminum composite strip coil 8. Therefore, by placing a nickel strip coil as an intermediate transition layer between the titanium and aluminum strip coils, the mechanical properties of the titanium-aluminum composite strip coil 8 are improved, expanding its application range.
[0021] It should be noted that the titanium-aluminum composite strip roll 8 can be a single-sided composite strip roll or a double-sided composite strip roll. When it is a single-sided composite strip roll, the titanium-aluminum composite strip roll 8 has a titanium-nickel-aluminum structure; when it is a double-sided composite strip roll, the titanium-aluminum composite strip roll 8 has a titanium-nickel-aluminum-nickel-titanium structure.
[0022] In some embodiments, the pickling and degreasing steps for the titanium strip coil, nickel strip coil, and aluminum strip coil 2 include: For the titanium strip coil, pickling and degreasing involves first ultrasonic cleaning with acetone, then immersion cleaning in a mixed acid solution (HF 5% + HNO3 30% + H2O 65%), and finally sandblasting to remove the oxide film on the titanium strip coil surface, increasing surface activity and roughness, and promoting mechanical bonding and atomic diffusion at the nickel-titanium interface. For the aluminum strip coil 2, pickling and degreasing involves first cleaning with ethanol, then immersion cleaning in a NaOH solution, and finally micro-etching with dilute sulfuric acid to remove the loose Al2O3 film on the titanium strip coil surface, forming uniform micro-pits and enhancing the bonding force at the nickel-aluminum interface. For the nickel strip coil, pickling and degreasing involves using an alkaline degreasing agent, followed by electrolytic activation with a sulfuric acid solution to remove the passivation film (NiO) on the nickel surface, exposing the fresh metal surface and improving affinity with titanium / aluminum.
[0023] In some embodiments, after the pickling and degreasing steps of the titanium strip, nickel strip, and aluminum strip 2, a texturing process is also included. The titanium strip is textured using laser irradiation, where a high-energy-density laser beam irradiates the surface of the titanium strip, causing the surface material to melt and vaporize instantaneously, forming a regularly distributed array of micropits with a depth of 10-20 μm, a pit diameter of 30-50 μm, and a spacing of 50-80 μm. This micropit structure significantly increases the specific surface area of the titanium strip, enabling a tighter mechanical bond with the nickel strip during subsequent lamination. The aluminum strip 2 is textured using electrical discharge machining, which creates micro-pits with a depth of 5-10 μm, a diameter of 20-40 μm, and a spacing of 40-60 μm on its surface, improving the microstructure of the aluminum strip 2 and enhancing its adhesion to the nickel strip. For nickel strip coils, chemical etching is used to roughen them by immersing them in a specific chemical etching solution, such as a mixture of hydrochloric acid and nitric acid in a volume ratio of 3:1. This forms a micro-uneven structure of varying sizes and depths of 3-8 μm on the surface of the nickel strip coil, increasing the contact area between the nickel strip coil and the titanium strip coil and aluminum strip coil 2.
[0024] In some embodiments, after the pickling and degreasing steps of the titanium strip coil, nickel strip coil, and aluminum strip coil 2, the process further includes: forming a titanium nanolayer on the side of the nickel strip coil facing the titanium strip coil by magnetron sputtering, and forming an aluminum nanolayer on the side of the nickel strip coil facing the aluminum strip coil 2 by magnetron sputtering. Specifically, a 50-100 nm titanium nanolayer is prepared on the surface of the nickel strip coil facing the titanium strip coil by magnetron sputtering; a 50-100 nm aluminum nanolayer is prepared on the surface of the nickel strip coil facing the aluminum strip coil 2 by magnetron sputtering. By setting the titanium nanolayer, interfacial atomic diffusion is promoted during rolling, forming a Ni-Ti solid solution transition region. By setting the aluminum nanolayer, interfacial atomic diffusion is promoted during rolling, forming a Ni-Al solid solution transition region. By magnetron sputtering an Al / Ti nanolayer with a thickness of 50-100 nm onto the surface of the nickel strip coil, the rapid diffusion of interfacial atoms during rolling is promoted, forming a solid solution transition zone, suppressing stress concentration at sharp interfaces, avoiding interlayer cracking of the titanium-aluminum composite strip coil 8, and improving the mechanical properties of the titanium-aluminum composite strip coil 8.
[0025] In some embodiments, after the steps of pickling and degreasing the titanium, nickel, and aluminum strip rolls, the process further includes: forming a titanium nanolayer on the side of the nickel strip roll facing the titanium strip roll by magnetron sputtering, and forming a copper composite layer on the side of the nickel strip roll facing the aluminum strip roll by electroplating. Specifically, a 50-100 nm titanium nanolayer is prepared on the surface of the nickel strip roll facing the titanium strip roll by magnetron sputtering; an 8-12 μm copper composite layer is prepared on the surface of the nickel strip roll facing the aluminum strip roll by electroplating. Since pure nickel strip rolls are expensive, and a small amount of brittle NiAl phase may still form at the nickel-aluminum interface, and copper is infinitely soluble with both aluminum and nickel, the copper composite layer further strengthens the interfacial bonding strength.
[0026] Figure 4 This is a schematic diagram of the titanium-aluminum composite strip roll 8 in an embodiment of the present invention, as shown below. Figure 4 As shown, aluminum coil layer 81, copper composite layer 82, nickel coil layer 83, titanium nanolayer 84, and titanium coil layer 85 are arranged sequentially from top to bottom.
[0027] In some embodiments, after the pickling and degreasing steps of the titanium strip coil, nickel strip coil, and aluminum strip coil 2, the process further includes: single-roll cold rolling of the nickel strip coil to prepare a gradient nickel strip coil. It should be noted that the microstructure of different regions of the gradient nickel strip coil differs. The region in contact with the titanium strip coil experiences significant deformation and thinning, exhibiting an ultrafine-grained structure; the region in contact with the aluminum strip coil experiences less deformation and thinning, exhibiting a coarse-grained structure. Specifically, the thinning rate on the first side of the gradient nickel strip coil is 60-70% to form a titanium connecting region, which is connected to the titanium strip coil; the thinning rate on the second side of the gradient nickel strip coil is 30-40% to form an aluminum connecting region, which is connected to the aluminum strip coil 2. Different thinning rates are achieved on both sides of the nickel strip coil through asymmetric rolling deformation. In the titanium connecting region, a greater reduction is applied during rolling, reducing the thickness of the titanium connecting region from the original 25-30 μm to 5-10 μm. In the aluminum bonding zone, a smaller reduction is applied during rolling, reducing the thickness from the original 25-30 μm to 10-20 μm. The total original thickness of the nickel strip coil is 50-60 μm.
[0028] By setting a thin titanium bonding region, the high stiffness of the titanium layer is matched, the stress concentration at the interface is avoided, and the diffusion path of titanium atoms is shortened, allowing titanium atoms to quickly penetrate into the nickel strip roll and preventing the formation of a continuous brittle layer between the titanium layer and the titanium bonding region.
[0029] By setting a thick aluminum bonding region, on the one hand, the aluminum layer's plastic deformation is matched, and the aluminum bonding region acts as a rigid support to prevent the aluminum layer from tearing due to excessive plastic deformation. On the other hand, the thick aluminum bonding region can increase diffusion resistance, preventing aluminum atoms from diffusing deep into the nickel strip roll and avoiding the formation of penetrating brittle metallic compounds between the aluminum layer and the aluminum bonding region.
[0030] In some embodiments, the steps of composite rolling of combined coil 1 with aluminum strip coil 2, or composite rolling of combined coil 1 with titanium strip coil, include composite rolling at room temperature using a four-high mill 3, with a reduction of 20%-30%, a rolling speed of 2-3 m / min, titanium side tension of 50-60 MPa, and aluminum side tension of 30-40 MPa. Composite rolling initially bonds the titanium-nickel-aluminum three layers together, utilizing the high ductility of the nickel strip coil to fill the microscopic gaps at the interface, forming a mechanical interlock, and then passing through the guide roller 9 to obtain the composite coil blank 4.
[0031] In some embodiments, the step of rolling the composite coil 4 includes heating the composite coil 4, heating the temperature of the titanium strip coil side to 450-500°C, heating the temperature of the aluminum strip coil 2 side to 200-250°C, performing 2-3 passes of hot rolling, with a single pass reduction of 40%-50% and a total reduction of 70%-80%.
[0032] Infrared radiation heating can be used to control the temperature of the titanium strip coil side at 450-500℃ and the aluminum strip coil side at 200-250℃. Dynamic recrystallization occurs on the titanium strip coil side at high temperature, promoting rapid diffusion of titanium and nickel atoms. The aluminum strip coil side is kept at a low temperature to slow down the aluminum-nickel interface reaction and prevent excessive growth of the NiAl phase. The nickel strip coil, as an active intermediate layer, undergoes atomic diffusion simultaneously with titanium and aluminum under high temperature and pressure, forming a titanium-nickel solid solution region and a nickel-aluminum dispersion strengthening region, achieving overall metallurgical bonding.
[0033] The heated composite coil 4 is fed into a 20-roll mill 7. Two to three hot rolling passes are performed, with each pass's reduction strictly controlled at 40%-50%, resulting in a total reduction of 70%-80%. During rolling, the roll gap is dynamically adjusted using the mill's automatic thickness control (AGC) system based on the real-time deformation of the composite coil, ensuring the accuracy of the rolled thickness. The rolling speed is controlled at 1-2 m / min to avoid excessively fast or slow speeds affecting rolling quality. After hot rolling, the composite coil 4 is introduced into a cooling device for cooling. Atomized water spray cooling is used; by adjusting the spray pressure and flow rate, the composite coil 4 is cooled to a lower temperature, preventing internal stress concentration or structural defects due to uneven cooling. Using the 20-roll mill 7, the titanium strip, nickel strip, and aluminum strip are more tightly bonded during the rolling process. Under the influence of high temperature and high pressure, the diffusion and bonding between titanium, nickel and aluminum atoms are promoted, which effectively improves the interfacial bonding strength of titanium-aluminum composite strip and reduces the risk of interlayer cracking.
[0034] In some embodiments, the annealing step of the composite coil 4 includes a second annealing process. The first annealing is performed at a temperature of 450-500℃ for 30-60 minutes under argon protection. The second annealing is performed under vacuum at a temperature of 350-400℃ for 15-30 minutes. The first annealing eliminates the rolling stress generated after rolling the composite coil 4 and promotes atomic diffusion at the bonding interface. The second annealing further homogenizes the interface transition zone between the aluminum strip coil 2 and the nickel strip coil, suppressing Ni-Al phase coarsening at high temperatures.
[0035] In some embodiments, the titanium strip coil is one of TA1, TA2, TA4, TC4, the aluminum strip coil 2 is one of 6061, 7075, 5052, and the nickel strip coil has a purity of ≥99.9%.
[0036] In some embodiments, after annealing the composite coil 4, the process further includes straightening and trimming the composite coil 4. During straightening, the elongation is 0.2%-0.3% to prevent excessive plastic deformation on one side of the aluminum strip coil 2. The trimming accuracy is ±0.1mm to remove the crack-sensitive area at the edge of the titanium-aluminum composite strip coil 8.
[0037] In some embodiments, a chromium-free passivating agent (such as a silane coupling agent) may be coated on the side of the aluminum strip roll 2 facing away from the nickel strip roll to prevent aluminum oxidation during storage. A nano-ceramic coating may be sprayed on the side of the titanium strip roll facing away from the nickel strip roll to prevent titanium from absorbing hydrogen during storage.
[0038] The first specific embodiment of this application is described below: A titanium strip coil of grade TA1 with a thickness of 0.5 mm was selected; an aluminum strip coil of grade 6061 with a thickness of 0.3 mm was selected; and a nickel strip coil with a purity ≥99.9% and an initial thickness of 25 μm was selected. The titanium strip coil, nickel strip coil, and aluminum strip coil were subjected to pickling and degreasing. A 50 nm titanium nanolayer was formed on the side of the nickel strip coil facing the titanium strip coil by magnetron sputtering, and a 50 nm aluminum nanolayer was formed on the side facing the aluminum strip coil.
[0039] The processed titanium strip coil and nickel strip coil are combined by a coiling machine to obtain composite coil 1. Then, composite coil 1 and aluminum strip coil 2 are compound rolled by a four-roll mill 3 at room temperature with a reduction of 20%, a rolling speed of 2m / min, titanium side tension of 50MPa, and aluminum side tension of 30MPa to prepare composite coil blank 4.
[0040] Infrared radiation heating is used to heat one side of the titanium strip coil of composite roll 4 to 450°C and the other side of the aluminum strip coil 2 to 200°C, and then hot-rolled in two passes with a single pass reduction of 40% and a total reduction of 70%.
[0041] The composite roll 4 was subjected to a second annealing process. The first annealing was carried out at 450℃ for 30 minutes under an argon protective atmosphere; the second annealing was a vacuum annealing at 350℃ for 15 minutes.
[0042] The annealed composite coil 4 was straightened with an elongation of 0.2%; it was then trimmed with an edge precision of ±0.1mm. A silane coupling agent was coated on the side of the aluminum strip coil 2 away from the nickel strip coil, and a nano-ceramic coating was sprayed on the side of the titanium strip coil away from the nickel strip coil.
[0043] The second specific embodiment of this application is described below: Titanium strip coil of grade TA2 with a thickness of 0.8 mm was selected; aluminum strip coil 2 of grade 7075 with a thickness of 0.5 mm was selected; and nickel strip coil with a purity of ≥99.9% and an original thickness of 30 μm was selected. The titanium strip coil, nickel strip coil and aluminum strip coil 2 were subjected to pickling and degreasing treatment.
[0044] First, the processed aluminum strip coil 2 and nickel strip coil are combined to obtain composite coil 1. Then, composite coil 1 and titanium strip coil are composite rolled at room temperature using a four-roll mill 3 with a reduction of 25%, a rolling speed of 2.5 m / min, a titanium side tension of 55 MPa, and an aluminum side tension of 35 MPa to prepare composite coil blank 4.
[0045] Using infrared radiation heating, one side of the titanium strip coil 4 was heated to 480℃, and the other side of the aluminum strip coil 2 was heated to 220℃, followed by two-pass hot rolling with a single-pass reduction of 45% and a total reduction of 75%. The first annealing temperature was 480℃, held for 45 minutes under argon protection; the second annealing was vacuum annealing at 380℃ for 20 minutes. The tensile elongation was 0.25%, and the trimming accuracy was ±0.1mm. Appropriate protective layers were coated and sprayed onto the surfaces of the aluminum strip coil 2 and the titanium strip coil, respectively.
[0046] The third specific embodiment of this application is described below: Titanium strip coil of grade TC4 with a thickness of 1 mm; aluminum strip coil 2 of grade 5052 with a thickness of 0.6 mm; and nickel strip coil with a purity of ≥99.9% and an original thickness of 30 μm. The titanium strip coil, nickel strip coil, and aluminum strip coil 2 underwent pickling and degreasing treatment.
[0047] The processed titanium strip coil and nickel strip coil are combined and then rolled together with aluminum strip coil 2 through a four-roll mill 3 at room temperature with a reduction of 30%, a rolling speed of 3m / min, a titanium side tension of 60MPa, and an aluminum side tension of 40MPa to prepare a composite coil blank 4.
[0048] The composite coil 4 is heated by infrared radiation, so that the temperature on one side of the titanium strip coil reaches 500℃ and the temperature on the other side of the aluminum strip coil 2 reaches 250℃. It is then hot rolled in 3 passes, with a single pass reduction of 50% and a total reduction of 80%.
[0049] The first annealing temperature was 500℃, held for 60 minutes, under argon protection; the second annealing was vacuum annealing at 400℃ for 30 minutes. The elongation rate was 0.3%, and the trimming accuracy was ±0.1mm. Protective treatments were applied to the surfaces of both the aluminum strip coil 2 and the titanium strip coil.
[0050] Performance tests were conducted on the titanium-aluminum composite strips prepared in Examples 1 to 3. The results showed that the bonding strength of the titanium-aluminum composite strips was significantly higher than that of products prepared by the traditional rolling composite method, interlayer cracking was effectively suppressed, and the mechanical properties were excellent.
[0051] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A method for preparing a titanium-aluminum composite strip, characterized in that, Includes the following steps: Titanium strip coils, nickel strip coils, and aluminum strip coils are pickled and degreased. The processed titanium strip coil and the nickel strip coil are combined using a coiling machine to obtain a combined coil, which is then composite-rolled with the aluminum strip coil to prepare a composite coil blank; or the processed aluminum strip coil and the nickel strip coil are combined using a coiling machine to obtain a combined coil, which is then composite-rolled with the titanium strip coil to prepare a composite coil blank; the titanium strip coil, the nickel strip coil, and the aluminum strip coil are stacked sequentially to form the composite coil blank; The composite coil is rolled; The composite roll blank is annealed to prepare titanium-aluminum composite strip roll.
2. The method for preparing titanium-aluminum composite strip according to claim 1, characterized in that, After the steps of pickling and degreasing the titanium strip, nickel strip, and aluminum strip, the method further includes: forming a titanium nanolayer on the side of the nickel strip facing the titanium strip by magnetron sputtering, and forming an aluminum nanolayer on the side of the nickel strip facing the aluminum strip by magnetron sputtering.
3. The method for preparing titanium-aluminum composite strip according to claim 2, characterized in that, The thickness of both the titanium nanolayer and the aluminum nanolayer is 50-100 nm.
4. The method for preparing titanium-aluminum composite strip according to claim 1, characterized in that, After the steps of pickling and degreasing the titanium strip, nickel strip, and aluminum strip, the process further includes: forming a titanium nanolayer on the side of the nickel strip facing the titanium strip by magnetron sputtering, and forming a copper composite layer on the side of the nickel strip facing the aluminum strip by electroplating.
5. The method for preparing titanium-aluminum composite strip according to claim 4, characterized in that, The thickness of the titanium nanolayer is 50-100 nm, and the thickness of the copper composite layer is 8-12 μm.
6. The method for preparing titanium-aluminum composite strip according to any one of claims 1 to 5, characterized in that, The step of performing composite rolling of the combined coil and the aluminum strip coil, or composite rolling of the combined coil and the titanium strip coil, includes: Composite rolling is performed at room temperature using a four-roll mill, with a reduction of 20%-30%, a rolling speed of 2-3 m / min, a titanium side tension of 50-60 MPa, and an aluminum side tension of 30-40 MPa.
7. The method for preparing titanium-aluminum composite strip according to claim 6, characterized in that, The step of rolling the composite coil includes: The composite coil is heated, with the temperature of one side of the titanium strip coil heated to 450-500℃ and the temperature of one side of the aluminum strip coil heated to 200-250℃, and hot rolled in 2-3 passes, with a single pass reduction of 40%-50% and a total reduction of 70%-80%.
8. The method for preparing titanium-aluminum composite strip according to claim 7, characterized in that, The step of annealing the composite roll includes: The composite roll is subjected to two annealing processes. The first annealing is performed at a temperature of 450-500℃ for 30-60 minutes under an argon protective atmosphere. The second annealing is performed under vacuum at a temperature of 350-400℃ for 15-30 minutes.
9. The method for preparing titanium-aluminum composite strip according to any one of claims 1 to 5, characterized in that, The titanium strip coil is of one of the grades TA1, TA2, TA4, and TC4; the aluminum strip coil is of one of the grades 6061, 7075, and 5052; and the nickel strip coil has a purity of ≥99.9%.
10. The method for preparing titanium-aluminum composite strip according to any one of claims 1 to 5, characterized in that, After annealing the composite roll, the method further includes: The composite roll is then straightened and trimmed.