Narrow-width titanium-aluminum solid-liquid composite material

Abstract

A narrow-width titanium-aluminum solid-liquid composite material. The composite material comprises a titanium strip and an aluminum strip, which is formed by casting and rolling molten aluminum, wherein the titanium strip is made of pure titanium or a titanium alloy; and the aluminum strip is one of 1-series pure aluminum, 3-series aluminum alloy, 5-series aluminum alloy and 6-series aluminum alloy. The peel strength between the titanium strip and the aluminum strip is greater than or equal to 60 N / mm. The tensile strength of the narrow-width titanium-aluminum solid-liquid composite material is greater than or equal to 300 MPa, the yield strength thereof is greater than or equal to 200 MPa, the composite surface shear strength thereof is greater than or equal to 180 MPa, and the elongation thereof is larger than or equal to 20%. The titanium-aluminum solid-liquid composite material has both good mechanical strength and bonding strength.

Description

Titanium-aluminum solid-liquid composite material with narrow width TECHNICAL FIELD

[0001] The application relates to the technical field of titanium composite material processing, in particular to a titanium-aluminum solid-liquid composite material with narrow width. BACKGROUND

[0002] A metal laminated composite plate is prepared by special processing of two or more than two metal plates with different properties, and the special processing of the metal laminated composite plate mainly includes cast-rolling compounding, friction welding and explosive welding. The semi-finished metal laminated composite plate obtained by cast-rolling compounding or friction welding or explosive welding needs to be annealed to eliminate the internal stress between the metal plates caused by special processing, and finally the finished metal laminated composite plate can be obtained through finish rolling, shaping and polishing. The metal laminated composite plate combines the physical and chemical performance advantages of two or more than two metal components, and has better comprehensive performance than any single metal, greatly expanding the application range of the metal laminated composite plate.

[0003] Titanium-aluminum alloy has the outstanding advantages of high specific strength, low density, toughness and good corrosion resistance, and is widely used in 3C consumer electronic products, aerospace, petrochemical industry, transportation and new energy vehicle fields.

[0004] Titanium / aluminum composite plates have been produced in actual industrial production. For example, a preparation method of a layered titanium-aluminum-steel composite strip material is disclosed in application publication CN112090961A. In step 1, pure titanium strip material, aluminum strip material and stainless steel strip material are respectively loaded into corresponding uncoiling equipment, the aluminum strip material is located in the middle position, and the pure titanium strip material and the stainless steel strip material are respectively located on the upper and lower sides of the aluminum strip material. In step 2, the pure titanium strip material, the aluminum strip material and the stainless steel strip material are simultaneously uncoiled, and the three strip materials enter the flow processing equipment at the same transmission rate for composite rolling treatment to obtain a composite strip initial product. The composite strip initial product is annealed to obtain a composite strip finished product, i.e. a layered titanium-aluminum-steel composite strip material, which has the characteristics of corrosion resistance, wear resistance, non-toxicity, antibacterial property, magnetic conductivity and good thermal conductivity, and improves the interlayer bonding force of the composite strip material.

[0005] The titanium / aluminum composite plate prepared by the prior art has good mechanical strength, but the interlayer bonding performance (peeling strength) is still lower than 50 N / mm, and it still belongs to the processing scheme of improving the overall mechanical strength at the expense of the interlayer bonding strength. In order to obtain a titanium-aluminum composite metal strip with high bonding strength and high mechanical performance, the inventors provide a titanium-aluminum solid-liquid composite material with narrow width and a preparation method and application thereof. SUMMARY

[0006] In order to solve the problem that the titanium / aluminum composite plate prepared by the prior art cannot have mechanical strength and bonding strength, the application provides a narrow-width titanium-aluminum solid-liquid composite material and a preparation method and application thereof.

[0007] The narrow-width titanium-aluminum solid-liquid composite material is realized by the following scheme.

[0008] The narrow-width titanium-aluminum solid-liquid composite material comprises a titanium strip and an aluminum strip formed by liquid aluminum casting and rolling, the titanium strip is made of pure titanium or titanium alloy, the aluminum strip is one of 1-series pure aluminum, 3-series aluminum alloy, 5-series aluminum alloy and 6-series aluminum alloy, the peeling strength between the titanium strip and the aluminum strip is greater than or equal to 60 N / mm, the tensile strength of the narrow-width titanium-aluminum solid-liquid composite material is greater than or equal to 300 MPa, the yield strength is greater than or equal to 200 MPa, the shear strength of the composite surface is greater than or equal to 180 MPa, and the elongation rate is greater than or equal to 20%.

[0009] The titanium-aluminum solid-liquid composite material prepared in the application has good mechanical strength and bonding strength, and application in the 3C consumer electronics field helps to improve the appearance quality of a smart phone and greatly reduce the weight of the smart phone, thereby meeting the lightweight design requirement of the smart phone. The narrow-width titanium-aluminum solid-liquid composite material in the application can be processed into a special-shaped titanium-aluminum solid-liquid composite material, including but not limited to a profile, a strip and a plate.

[0010] The preparation method of the narrow-width titanium-aluminum solid-liquid composite material is realized by the following technical scheme.

[0011] The preparation method of the narrow-width titanium-aluminum solid-liquid composite material is as follows: titanium-aluminum composite strip crude products are obtained by titanium strip and liquid aluminum casting and rolling, then the titanium-aluminum composite strip crude products are subjected to large-deformation hot finish rolling to obtain first-level titanium-aluminum composite strip crude products, the hot finish rolling temperature is 400-600 DEG C, after cooling treatment, small-deformation cold finish rolling is performed to obtain second-level titanium-aluminum composite strip crude products, and finally the second-level titanium-aluminum composite strip crude products are straightened and polished to obtain finished products of the narrow-width titanium-aluminum solid-liquid composite material.

[0012] Preferably, the thickness ratio of the titanium strip to the aluminum strip in the titanium-aluminum composite strip crude products is 1:(2-3).

[0013] Further preferably, the thickness ratio of the titanium strip to the aluminum strip in the titanium-aluminum composite strip crude products is 1:2. During the large-deformation hot finish rolling process, the deformation amount of the titanium-aluminum composite strip crude products is 50-70%.

[0014] During the small-deformation cold finish rolling process, the cold finish rolling is performed once or twice, the total deformation amount of the first-level titanium-aluminum composite strip crude products during the cold finish rolling process is 2-10%, and the single-pass deformation amount is less than or equal to 5%.

[0015] Preferably, the specific preparation method of the titanium-aluminum composite strip crude product is as follows: aluminum alloy is melted to obtain molten aluminum liquid, the obtained molten aluminum liquid flows out through a forehearth and a nozzle, contacts a running titanium strip, and is cast-rolled under a casting and rolling machine to realize composite rolling, the surface roughness of the titanium strip is 1-8 μm, the preheating temperature of the titanium strip is 20-500 ℃, the casting and rolling speed is 0.5-2.0 m / min, and the roller cooling water flow rate is set to 3000-4000 L / h, so that the liquid aluminum and the solid titanium are combined to form the titanium-aluminum composite strip crude product.

[0016] Further preferably, the specific preparation method of the titanium-aluminum composite strip crude product is as follows: aluminum alloy is melted to obtain molten aluminum liquid, the obtained molten aluminum liquid flows out through a forehearth and a nozzle, contacts a running titanium strip, and is cast-rolled under a casting and rolling machine to realize composite rolling, the titanium strip is polished to remove the oxide skin before composite rolling, the surface roughness is 4-6 μm, and laser etching treatment is performed under argon, so that the mechanical strength and the bonding strength of the titanium-aluminum composite strip can be improved. The preheating temperature of the titanium strip is 400 ℃, the casting and rolling speed is 1.0 m / min, and the roller cooling water flow rate is set to 4000 L / h, so that the liquid aluminum and the solid titanium are combined to form the titanium-aluminum composite strip crude product.

[0017] In the present application, in the hot finish rolling process with large deformation, high temperature and large pressure can make the titanium-aluminum bonding interface re-generate composite layer material, so as to improve the bonding effect. Through the above technical solution, the alloy grain refinement effect can be improved, and a large number of high-density dislocations, dislocation cells and substructures are contained in the internal organization. The combination of fine-grain strengthening and dislocation strengthening can effectively improve the strength of the titanium-aluminum composite strip and ensure the processing yield of the titanium-aluminum composite material, and ensure the good bonding performance between the titanium strip and the aluminum strip.

[0018] Further preferably, in the casting and rolling composite, the temperature of the molten aluminum liquid is 665-700 ℃, and the casting speed is 0.5-2.0 m / min.

[0019] Further preferably, in the casting and rolling composite, the temperature of the molten aluminum liquid is 680 ℃, and the casting speed is 1.0 m / min.

[0020] Through the above technical solution, the strength and bonding performance of the titanium-aluminum composite strip can be further improved.

[0021] Preferably, the specific preparation method of the first-stage titanium-aluminum composite strip crude product is as follows: the obtained first-stage titanium-aluminum composite strip crude product is subjected to large deformation hot finish rolling treatment, the hot finish rolling temperature is 400-600 ℃, and the obtained product is taken out and restored to room temperature.

[0022] Through the above technical solution, the large deformation hot finish rolling can re-generate composite layer material to improve the bonding effect and control the thickness of the strip.

[0023] Preferably, the specific preparation method of the secondary titanium-aluminum composite strip crude product is as follows: the roughness of the work roll in the cold precision rolling treatment of the obtained primary titanium-aluminum composite strip finished product is less than or equal to 0.5 microns, the single pass deformation is less than or equal to 5%, and the total deformation is 2-10%.

[0024] The purpose of the above-mentioned cold precision rolling is to improve the flatness of the finished titanium-aluminum strip, and the small deformation amount of rolling can make the internal stress of the material re-distributed uniformly, thereby further improving the mechanical properties of the composite strip.

[0025] The narrow-width titanium-aluminum solid-liquid composite material is applied in the fields of new energy, power distribution, copper-aluminum distribution, heat dissipation, consumer electronics, semiconductors, communication, satellites, computers, wind power and hydrogen energy, lithium batteries, photovoltaics, military, robots, travel equipment, medical devices, aerospace, 3C.

[0026] Preferably, in the field of 3C consumer electronics, specifically, the narrow-width titanium-aluminum solid-liquid composite material is used as the body material or structural material of high-end smart phones, and the prepared narrow-width titanium-aluminum solid-liquid composite material has the advantages of being light, high-strength, corrosion-resistant, and good in texture, which helps to improve the appearance design of the smart phone and also greatly reduces the weight of the body.

[0027] In summary, the present application has the following advantages:

[0028] 1. The titanium-aluminum solid-liquid composite material prepared in the present application has good mechanical strength and bonding strength, and is applied in the field of 3C consumer electronics to improve the appearance texture of the smart phone. Compared with pure titanium material, the titanium-aluminum composite material can also greatly reduce the weight of the body, meeting the lightweight design requirements of the smart phone.

[0029] 2. The preparation method of the present application is relatively simple, low in operation difficulty, and convenient for industrialized production and manufacturing. BRIEF DESCRIPTION OF DRAWINGS

[0030] FIG. 1 is a scanning electron microscope (SEM) image of the interface of the titanium-aluminum solid-liquid composite material in Example 1. DETAILED DESCRIPTION

[0031] In order to further understand the creativity and technical progress of the present application, the preferred embodiments of the present application are discussed in detail below in combination with examples and comparative examples. It should be noted that the specific embodiments are only an explanation and description of the technical solutions of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, as long as the modifications are within the scope of the claims of the present application.

[0032] EXAMPLE

[0033] A narrow-width titanium-aluminum solid-liquid composite material comprises a titanium strip and an aluminum strip formed by casting and rolling of liquid aluminum, the titanium strip being pure titanium or titanium alloy, and the aluminum strip being one of 1-series pure aluminum, 3-series aluminum alloy, 5-series aluminum alloy, and 6-series aluminum alloy. The narrow-width titanium-aluminum solid-liquid composite material can be processed into a profiled titanium-aluminum solid-liquid composite material, including but not limited to a profiled material, a strip, and a plate.

[0034] The peeling strength between the titanium strip and the aluminum strip is ≥65 N / mm, the tensile strength of the narrow-width titanium-aluminum solid-liquid composite material is ≥300 MPa, the yield strength is ≥200 MPa, the shear strength of the composite surface is ≥180 MPa, and the elongation is ≥20%.

[0035] A preparation method of the narrow-width titanium-aluminum solid-liquid composite material is as follows: titanium-aluminum composite strip crude products are obtained by casting and rolling of the titanium strip and liquid aluminum, then the titanium-aluminum composite strip crude products are subjected to large-deformation hot finish rolling to obtain first-level titanium-aluminum composite strip crude products, the hot finish rolling temperature is 400-600 ℃, after cooling treatment, the first-level titanium-aluminum composite strip crude products are subjected to small-deformation cold finish rolling to obtain second-level titanium-aluminum composite strip crude products, and finally the second-level titanium-aluminum composite strip crude products are straightened and polished to obtain finished narrow-width titanium-aluminum solid-liquid composite material.

[0036] Preferably, the thickness ratio of the titanium strip to the aluminum strip in the titanium-aluminum composite strip crude products is 1:(2-3), and more preferably, the thickness ratio of the titanium strip to the aluminum strip in the titanium-aluminum composite strip crude products is 1:2. The deformation amount of the titanium-aluminum composite strip crude products in the large-deformation hot finish rolling process is 50-70%.

[0037] In the small-deformation cold finish rolling process, the cold finish rolling is performed once or twice, and the total deformation amount of the first-level titanium-aluminum composite strip crude products in the cold finish rolling process is 2-10%, and the single-pass deformation amount is ≤5%.

[0038] Specifically, a preparation method of a narrow-width titanium-aluminum solid-liquid composite material comprises the following steps:

[0039] S1. The specific preparation method of the titanium-aluminum composite strip crude products is as follows: aluminum alloy is melted to obtain aluminum liquid, the obtained molten aluminum liquid flows out through a forehearth and a casting nozzle, and contacts a running titanium strip to perform casting and rolling under a casting and rolling machine, the titanium strip is polished to remove the oxide scale before being combined, so that the surface roughness is 1-8 μm, the preheating temperature of the titanium strip is 20-500 ℃, the casting and rolling speed is 0.5-2.0 m / min, the rolling roller cooling water flow rate is set to 3000-4000 L / h, and the liquid aluminum and the solid titanium are combined to form the titanium-aluminum composite strip crude products by casting and rolling.

[0040] Preferably, the surface roughness of the titanium strip is 4-6 μm, the preheating temperature of the titanium strip is 400 ℃, the casting-rolling speed is 1 m / min, and the roller cooling water flow rate is set to 4000 L / h, and the liquid aluminum is compounded with the solid titanium by casting-rolling to form the titanium-aluminum composite strip crude product;

[0041] Preferably, the temperature of the molten aluminum in the casting-rolling compounding is 665-700 ℃, and the casting speed is 0.5-2.0 m / min, and further preferably, the temperature of the molten aluminum in the casting-rolling compounding is 680 ℃, and the casting speed is 1.0 m / min;

[0042] S2. The specific preparation method of the primary titanium-aluminum composite strip crude product is as follows: the obtained titanium-aluminum composite strip crude product is subjected to large deformation amount hot finishing rolling treatment, the hot finishing rolling temperature is 400-600 ℃, the deformation amount is 50-70%, and the rolling speed can be 0.5-5.0 m / min, and is preferably 2-3.0 m / min;

[0043] After being restored to room temperature, the primary titanium-aluminum composite strip crude product is obtained.

[0044] S3. The specific preparation method of the secondary titanium-aluminum composite strip crude product is as follows: the obtained primary titanium-aluminum composite strip crude product is subjected to 1-2 times of small deformation amount cold finishing rolling treatment, the roughness of the working roller in the cold finishing rolling treatment is ≤0.5 μm, the single pass deformation amount is ≤5%, and the total deformation amount is 2-10%, and the secondary titanium-aluminum composite strip crude product is obtained.

[0045] S4. The secondary titanium-aluminum composite strip crude product obtained in S3 is subjected to straightening and polishing treatment to obtain the finished product, i.e. the narrow-width titanium-aluminum solid-liquid composite material.

[0046] The prepared narrow-width titanium-aluminum solid-liquid composite material can be applied in the fields of new energy, electric power, copper-aluminum, heat dissipation, consumer electronics, semiconductors, communication, satellites, computers, wind power and hydrogen energy, lithium batteries, photovoltaics, military, robots, travel equipment, medical devices, aerospace, and 3C.

[0047] Preferably, the narrow-width titanium-aluminum solid-liquid composite material is applied in the field of 3C consumer electronics, specifically, the narrow-width titanium-aluminum solid-liquid composite material is used as the body material or structural material of high-end smart phones, the prepared narrow-width titanium-aluminum solid-liquid composite material has the advantages of being light, high-strength, corrosion-resistant, and good in texture, which helps to improve the appearance design and texture of smart phones, and also greatly reduces the weight of the body, meeting the lightweight design requirements of smart phones.

[0048] The raw material sources are as follows: titanium strip, titanium strip TA2, Baoji Hesenhai Titanium Nickel Co., Ltd.; 6061 aluminum alloy, Dongguan Yida Metal Material Co., Ltd.

[0049] A specific preferred embodiment is as follows:

[0050] Embodiment 1: A method for preparing a narrow-width titanium-aluminum solid-liquid composite material, comprising the following steps:

[0051] S1. First, the titanium strip is polished to remove surface impurities such as oxides, and is polished with 500# sandpaper, 1000# sandpaper, 2000# sandpaper, 5000# sandpaper, and 10000# sandpaper in sequence. The roughness of the polished titanium strip is 1.7 μm. The specific preparation method of the titanium-aluminum composite strip crude product is as follows: the 6061 aluminum alloy is heated to 680℃, melted to obtain an aluminum liquid, the obtained molten aluminum liquid is discharged through a front box and a casting nozzle, and is in contact with the polished titanium strip in operation, and is cast and rolled in a casting and rolling machine. The titanium strip surface roughness is 1.7 μm, the casting speed is 1.0 mm / min, the preheating temperature of the titanium strip is 500℃, the casting and rolling speed is 1.0 m / min, and the roller cooling water flow is set to 3000 L / h. The liquid aluminum is combined with the solid titanium by casting and rolling to form a titanium-aluminum composite strip crude product. The thickness of the titanium strip in the titanium-aluminum composite strip crude product is 4 mm, the thickness of the aluminum strip is 8 mm, and the total thickness of the titanium-aluminum composite strip crude product is 12 mm.

[0052] S2. The specific preparation method of the first-stage titanium-aluminum composite strip crude product is as follows: the obtained titanium-aluminum composite strip crude product is subjected to a large deformation amount hot finish rolling treatment, the hot finish rolling treatment temperature is 500℃, the deformation amount is 50%, and the rolling speed is 0.5 m / min. The thickness of the first-stage titanium-aluminum composite strip crude product is 6 mm.

[0053] S3. The specific preparation method of the second-stage titanium-aluminum composite strip crude product is as follows: the obtained first-stage titanium-aluminum composite strip crude product is subjected to 1 time small deformation amount cold finish rolling treatment, the roughness of the work roll in the cold finish rolling treatment is 0.5 μm, and the deformation amount is 5%. The second-stage titanium-aluminum composite strip crude product with a thickness of 5.7 mm is obtained.

[0054] S4. The second-stage titanium-aluminum composite strip crude product obtained in S3 is subjected to straightening and polishing treatment to obtain the finished narrow-width titanium-aluminum solid-liquid composite material.

[0055] Referring to FIG. 1, the scanning electron microscope (SEM) image of the titanium-aluminum solid-liquid composite material interface is imaged by a backscattered electron detector (BSD), and the microstructure characteristics of the interface region are clearly presented in the backscattered electron mode. The image shows that the titanium / aluminum interface bonding zone morphology is continuous, without obvious macroscopic defects, the interface transition is gentle, indicating that there is good metallurgical bonding between the two phases. The backscattered electron contrast is significantly different, reflecting the composition partition characteristics caused by the atomic number difference between titanium and aluminum. A diffusion reaction layer is visible at the interface, and the microstructure presents a gradient transition. No obvious pores, cracks or inclusions are observed near the interface, and the microstructure compatibility between the bonding zone and the matrix is good.

[0056] Example 2 differs from Example 1 in that: S1. The titanium strip is first polished to remove impurities such as oxides on the surface, and is polished with 500# sandpaper, 1000# sandpaper, 2000# sandpaper, and 5000# sandpaper in sequence. The roughness of the polished titanium strip is 3.5 μm. The remaining steps are the same.

[0057] Example 3 differs from Example 1 in that: S1. The titanium strip is first polished to remove impurities such as oxides on the surface, and is polished with 500# sandpaper, 1000# sandpaper, 2000# sandpaper, and 3000# sandpaper in sequence. The roughness of the polished titanium strip is 4.7 μm. The remaining steps are the same.

[0058] Example 4 differs from Example 1 in that: S1. The titanium strip is first polished to remove impurities such as oxides on the surface, and is polished with 500# sandpaper, 1000# sandpaper, 2000# sandpaper, and 2500# sandpaper in sequence. The roughness of the polished titanium strip is 5.9 μm. The remaining steps are the same.

[0059] Example 5 differs from Example 1 in that: S1. The titanium strip is first polished to remove impurities such as oxides on the surface, and is polished with 500# sandpaper, 1000# sandpaper, and 2000# sandpaper in sequence. The roughness of the polished titanium strip is 7.8 μm. The remaining steps are the same.

[0060] Example 6 differs from Example 1 in that: S1. The titanium strip is first polished to remove impurities such as oxides on the surface, and is polished with 500# sandpaper, 1000# sandpaper, 2000# sandpaper, and 2500# sandpaper in sequence. The roughness of the polished titanium strip is 5.9 μm. The polished titanium strip is subjected to laser etching treatment in an argon atmosphere, with a laser power of 25 W, a voltage of 220 V, a repeat accuracy of 0.25 mm, and an etching speed of 2000 mm / s. The laser-etched titanium strip is formed into a titanium-aluminum composite strip by casting and rolling with liquid aluminum. The remaining steps are the same.

[0061] Comparative Example 1 differs from Example 1 in that: S1. The titanium strip is not polished. The unpolished titanium strip is formed into a titanium-aluminum composite strip by casting and rolling with liquid aluminum. The remaining steps are the same.

[0062] Comparative Example 2 differs from Example 1 in that: S1. The titanium strip is first polished to remove impurities such as oxides on the surface, and is polished with 500# sandpaper, 1000# sandpaper, and 1340# sandpaper in sequence. The roughness of the polished titanium strip is 10.2 μm. The remaining steps are the same.

[0063] Comparative Example 3 differs from Example 1 in that: S1. The unpolished titanium strip is subjected to laser etching treatment in an air atmosphere, the laser power is 25 W, the voltage is 220 V, the repeat accuracy is 0.25 mm, the etching speed is 2000 mm / s, the titanium strip obtained by laser etching is combined with liquid aluminum by casting and rolling to form a titanium-aluminum composite strip crude product, and the remaining steps are the same.

[0064] Test Method 1: According to the requirements of GB / T 228-2002 for metal tensile and peel specimens, tensile specimens and peel specimens are cut from the titanium-aluminum composite strip. The peel specimens are processed using a wire cutting according to GB / T 2791-1995. Tensile and peel tests are performed on a universal mechanical testing machine (model CMT5105). Due to the relatively thick aluminum plate, the lower end of the aluminum plate is fixed and the upper end of the titanium strip is clamped during the peel test to stretch and peel the specimen, and the peel strength of the titanium-aluminum composite strip is obtained through data analysis and processing.

[0065] Table 1: Test parameter table of titanium-aluminum composite strip in Examples 1-6 and Comparative Examples 1-3

[0066] As can be seen from Examples 1-6 and Comparative Examples 1-3 in combination with Table 1, when the surface roughness of the titanium strip after polishing is controlled to be 1-8 microns, the mechanical strength and bonding strength of the titanium-aluminum composite strip prepared are both relatively good.

[0067] As can be seen from Examples 6, 4, and Comparative Example 3 in combination with Table 1, after polishing the titanium strip to a surface roughness of 4-6 microns and then performing laser etching treatment in argon, the mechanical strength of the titanium-aluminum composite strip prepared in Example 6 is improved compared to that in Examples 4 and Comparative Example 3, and the bonding strength of the titanium-aluminum composite strip prepared in Example 6 is significantly improved compared to that in Examples 4 and Comparative Example 3. Therefore, polishing the titanium strip to a surface roughness of 4-6 microns and then performing laser etching treatment in argon can improve the mechanical strength and bonding strength of the titanium-aluminum composite strip.

[0068] Example 7 differs from Example 6 in that the preheating temperature of the polished titanium strip is 20°C.

[0069] Example 8 differs from Example 6 in that the preheating temperature of the polished titanium strip is 100°C.

[0070] Example 9 differs from Example 6 in that the preheating temperature of the polished titanium strip is 200°C.

[0071] Example 10 differs from Example 6 in that the preheating temperature of the polished titanium strip is 400°C.

[0072] Comparative Example 4 differs from Example 6 in that the preheating temperature of the polished titanium strip is 10°C.

[0073] The difference between Comparative Example 5 and Example 6 is that the preheating temperature of the polished titanium strip is 500°C.

[0074] Table 2: Test parameter table of titanium-aluminum composite strip in Examples 6-10 and Comparative Examples 4-5

[0075] In combination with Examples 6-10 and Comparative Examples 4-5 and in combination with Table 2, it can be seen that the preheating temperature of the polished titanium strip is controlled to be 20-400°C, which can ensure that the mechanical strength and bonding strength of the prepared titanium-aluminum composite strip are both relatively good. Preferably, the preheating temperature of the polished titanium strip is controlled to be 400°C. When the preheating temperature of the polished titanium strip is too high, an oxide layer is easily formed on the surface of the titanium strip, which is not conducive to the improvement of the overall interlayer bonding strength.

[0076] The difference between Example 11 and Example 8 is that the casting speed is 0.5 m / min.

[0077] The difference between Example 12 and Example 8 is that the casting speed is 1.5 m / min.

[0078] The difference between Example 13 and Example 8 is that the casting speed is 2.0 m / min.

[0079] The difference between Comparative Example 6 and Example 8 is that the casting speed is 0.25 m / min.

[0080] The difference between Comparative Example 7 and Example 8 is that the casting speed is 2.5 m / min.

[0081] Table 3: Test parameter table of titanium-aluminum composite strip in Examples 8, 11-13 and Comparative Examples 6-7

[0082] In combination with Examples 8, 11-13 and Comparative Examples 6-7 and in combination with Table 3, it can be seen that the casting speed in S1 is controlled to be 0.5-2.0 m / min, and the mechanical strength and bonding strength of the prepared titanium-aluminum composite strip are both relatively good. From the comprehensive consideration of production efficiency and product performance, it is relatively good that the casting speed in S1 is controlled to be 1.0-1.5 m / min.

[0083] The difference between Example 14 and Example 1 is that the thickness of the titanium-aluminum composite strip crude product is 12 mm, in which the thickness of the titanium strip is 3 mm and the thickness of the aluminum strip is 9 mm.

[0084] The difference between Example 15 and Example 1 is that the thickness of the titanium-aluminum composite strip crude product is 12 mm, in which the thickness of the titanium strip is 3.5 mm and the thickness of the aluminum strip is 8.5 mm.

[0085] Comparative Example 8 differs from Example 1 in that the thickness of the titanium-aluminum composite strip crude product is 12 mm, wherein the thickness of the titanium strip is 5 mm and the thickness of the aluminum strip is 7 mm.

[0086] Comparative Example 9 differs from Example 1 in that the thickness of the titanium-aluminum composite strip crude product is 12 mm, wherein the thickness of the titanium strip is 6 mm and the thickness of the aluminum strip is 6 mm.

[0087] Table 4: Test parameter table of titanium-aluminum composite strips in Example 1, Examples 14-15 and Comparative Examples 8-9

[0088] It can be seen from the combination of Example 1, Examples 14-15 and Comparative Examples 8-9 and Table 4 that when the thickness ratio of the titanium strip to the aluminum strip in the titanium-aluminum composite strip crude product is 1:(2-3), the mechanical strength and the bonding strength of the obtained titanium-aluminum composite strip are both relatively good. Considering the energy consumption cost and the product performance comprehensively, the thickness ratio of the titanium strip to the aluminum strip is preferably 1:2.

[0089] Example 16 differs from Example 15 in that the roller cooling water flow is 3300 L / h.

[0090] Example 17 differs from Example 15 in that the roller cooling water flow is 3700 L / h.

[0091] Example 18 differs from Example 15 in that the roller cooling water flow is 4000 L / h.

[0092] Comparative Example 10 differs from Example 15 in that the roller cooling water flow is 2800 L / h.

[0093] Comparative Example 11 differs from Example 15 in that the roller cooling water flow is 4200 L / h.

[0094] Table 5: Test parameter table of titanium-aluminum composite strips in Examples 15-18 and Comparative Examples 10-11

[0095] It can be seen from the combination of Examples 15-18 and Comparative Examples 10-11 and Table 5 that when the roller cooling water flow in S1 is 3000-4000 L / h, the mechanical strength and the bonding strength of the obtained titanium-aluminum composite strip are both relatively good. The effect of the roller cooling water flow in S1 on the mechanical strength and the bonding strength of the titanium-aluminum composite strip is relatively obvious, and preferably, the roller cooling water flow in S2 is 4000 L / h, and the comprehensive performance of the titanium-aluminum composite strip is good.

[0096] Example 19 differs from Example 18 in that: S2. The specific preparation method of the primary titanium-aluminum composite strip crude product is as follows: the obtained titanium-aluminum composite strip crude product is subjected to a large deformation amount hot finish rolling treatment, the deformation amount is 50%, the rolling speed is 1.0 m / min, and the thickness of the primary titanium-aluminum composite strip crude product is 6 mm.

[0097] Example 20 differs from Example 18 in that: S2. The specific preparation method of the primary titanium-aluminum composite strip crude product is as follows: the obtained titanium-aluminum composite strip crude product is subjected to a large deformation amount hot finish rolling treatment, the deformation amount is 50%, the rolling speed is 2.0 m / min, and the thickness of the primary titanium-aluminum composite strip crude product is 6 mm.

[0098] Example 21 differs from Example 18 in that: S2. The specific preparation method of the primary titanium-aluminum composite strip crude product is as follows: the obtained titanium-aluminum composite strip crude product is subjected to a large deformation amount hot finish rolling treatment, the deformation amount is 50%, the rolling speed is 2.5 m / min, and the thickness of the primary titanium-aluminum composite strip crude product is 6 mm.

[0099] Example 22 differs from Example 18 in that: S2. The specific preparation method of the primary titanium-aluminum composite strip crude product is as follows: the obtained titanium-aluminum composite strip crude product is subjected to a large deformation amount hot finish rolling treatment, the deformation amount is 50%, the rolling speed is 3.0 m / min, and the thickness of the primary titanium-aluminum composite strip crude product is 6 mm.

[0100] Example 23 differs from Example 18 in that: S2. The specific preparation method of the primary titanium-aluminum composite strip crude product is as follows: the obtained titanium-aluminum composite strip crude product is subjected to a large deformation amount hot finish rolling treatment, the deformation amount is 50%, the rolling speed is 4.0 m / min, and the thickness of the primary titanium-aluminum composite strip crude product is 6 mm.

[0101] Example 24 differs from Example 18 in that: S2. The specific preparation method of the primary titanium-aluminum composite strip crude product is as follows: the obtained titanium-aluminum composite strip crude product is subjected to a large deformation amount hot finish rolling treatment, the deformation amount is 50%, the rolling speed is 5.0 m / min, and the thickness of the primary titanium-aluminum composite strip crude product is 6 mm.

[0102] Comparative Example 12 differs from Example 18 in that: Example 20 differs from Example 18 in that: S2. The specific preparation method of the primary titanium-aluminum composite strip crude product is as follows: the obtained titanium-aluminum composite strip crude product is subjected to a large deformation amount hot finish rolling treatment, the deformation amount is 50%, the rolling speed is 0.4 m / min, and the thickness of the primary titanium-aluminum composite strip crude product is 6 mm.

[0103] The difference between Comparative Example 13 and Example 18 is that: the difference between Example 20 and Example 18 is that: S2. The specific preparation method of the primary titanium-aluminum composite strip crude product is as follows: the obtained titanium-aluminum composite strip crude product is subjected to large deformation amount hot finishing treatment, the deformation amount is 50%, and the rolling speed is 6 m / min. The thickness of the primary titanium-aluminum composite strip crude product is 6 mm.

[0104] Table 6: Test parameter table of titanium-aluminum composite strip in Examples 18-24 and Comparative Examples 12-13

[0105] It can be seen from Examples 18-24 and Comparative Examples 12-13 in combination with Table 6 that the casting and rolling speed in S2 is controlled to be 0.5-5.0 m / min, and the mechanical strength and bonding strength of the titanium-aluminum composite strip are relatively good. Preferably, the casting and rolling speed in S2 is 2-3 m / min, and the comprehensive performance of the obtained titanium-aluminum composite strip is excellent, and the production efficiency is relatively fast.

[0106] The difference between Example 25 and Example 21 is that: S3. The specific preparation method of the secondary titanium-aluminum composite strip crude product is as follows: the obtained primary titanium-aluminum composite strip crude product is subjected to 1 time of cold finishing treatment, the roughness of the work roll in the cold finishing treatment is 0.5 μm, and the total deformation amount is 4%, so that the secondary titanium-aluminum composite strip crude product with a thickness of 5.76 mm is obtained.

[0107] The difference between Example 26 and Example 25 is that:

[0108] S3. The specific preparation method of the secondary titanium-aluminum composite strip crude product is as follows: the obtained primary titanium-aluminum composite strip crude product is subjected to 2 times of cold finishing treatment, the roughness of the work roll in the cold finishing treatment is 0.5 μm, and the total deformation amount of the cold finishing treatment steps is 4%, so that the secondary titanium-aluminum composite strip crude product with a thickness of 5.76 mm is obtained.

[0109] The difference between Comparative Example 14 and Example 26 is that: S3. The specific preparation method of the secondary titanium-aluminum composite strip crude product is as follows: the obtained primary titanium-aluminum composite strip crude product is subjected to 1 time of cold finishing treatment, the roughness of the work roll in the cold finishing treatment is 0.5 μm, and the total deformation amount is 6%, so that the secondary titanium-aluminum composite strip crude product with a thickness of 5.64 mm is obtained.

[0110] The difference between Comparative Example 15 and Example 26 is that: S3. The specific preparation method of the secondary titanium-aluminum composite strip crude product is as follows: the obtained primary titanium-aluminum composite strip crude product is subjected to 2 times of cold finishing treatment, the roughness of the work roll in the cold finishing treatment is 0.5 μm, the single deformation amount is 6%, and the total deformation amount is 12%, so that the secondary titanium-aluminum composite strip crude product with a thickness of 5.28 mm is obtained.

[0111] Example 27 differs from Example 26 in that the specific preparation method of the secondary titanium-aluminum composite strip rough product is as follows: the obtained primary titanium-aluminum composite strip rough product is subjected to 1 time of cold finish rolling treatment, the roughness of the work roll in the cold finish rolling treatment is 0.5 μm, and the total deformation amount is 5%, so that the secondary titanium-aluminum composite strip rough product with a thickness of 5.7 mm is obtained.

[0112] Example 28 differs from Example 26 in that the specific preparation method of the secondary titanium-aluminum composite strip rough product is as follows: the obtained primary titanium-aluminum composite strip finished product is subjected to 2 times of cold finish rolling treatment, the roughness of the work roll in the cold finish rolling treatment is 0.5 μm, and the total deformation amount is 5%, so that the secondary titanium-aluminum composite strip rough product with a thickness of 1.0 mm is obtained.

[0113] Example 29 differs from Example 26 in that:

[0114] The specific preparation method of the secondary titanium-aluminum composite strip rough product is as follows: the obtained primary titanium-aluminum composite strip rough product is subjected to 3 times of cold finish rolling treatment, the roughness of the work roll in the cold finish rolling treatment is 0.5 μm, and the total deformation amount is 4%, so that the secondary titanium-aluminum composite strip rough product with a thickness of 5.76 mm is obtained.

[0115] Table 7: Test parameter table of titanium-aluminum composite strips in Examples 21, 25-29 and Comparative Examples 14-15

[0116] It can be seen from Examples 21, 25-29 and Comparative Examples 14-15 and Table 7 that the obtained primary titanium-aluminum composite strip finished product is subjected to 1 to 2 times of cold finish rolling treatment with a small deformation amount, the roughness of the work roll in the cold finish rolling treatment is ≤0.5 μm, the single-pass deformation amount is ≤5%, and the total deformation amount is 2-12%, so that the prepared titanium-aluminum composite strip has excellent mechanical strength and bonding strength. From the comprehensive consideration of production efficiency and product performance, the number of cold finish rolling treatments is preferably controlled to be 1 or 2. As seen from Example 29, increasing the number of cold finish rolling treatments has little effect on the performance, but increasing the number of cold finish rolling treatments increases the cost, so the number of cold finish rolling treatments should not be too much. As seen from Comparative Example 14 and Comparative Example 15, the deformation amount of single-pass cold finish rolling treatment should not be too large and should be controlled to be within 5%. After analysis, cold finish rolling treatment reduces the composite effect of the composite material, so cold finish rolling treatment is mainly used to adjust the thickness accuracy of the composite material, and a large deformation amount of cold finish rolling treatment has a huge impact on the performance of the composite material, especially the peel strength decreases greatly. Comprehensive analysis shows that the number of cold finish rolling treatments should be controlled to be within 2, and the deformation amount of single-pass cold finish rolling treatment should be ≤5%.

[0117] In summary, the titanium-aluminum solid-liquid composite prepared in the application has good mechanical strength and bonding strength, through optimization of the preparation process parameters, the tensile strength of the prepared titanium-aluminum solid-liquid composite strip is greater than or equal to 300 MPa, the yield strength is greater than or equal to 200 MPa, the composite surface shear strength is greater than or equal to 180 MPa, the elongation is greater than or equal to 20%, and the peeling strength is greater than or equal to 60 N / mm, application in the 3C consumer electronics field helps to improve the appearance quality of the smart phone and also can greatly reduce the weight of the body, and meets the lightweight design requirements of the smart phone.

Claims

1. A titanium-aluminum solid-liquid composite having a narrow aspect ratio, characterized by: The narrow-width titanium-aluminum solid-liquid composite material comprises a titanium strip and an aluminum strip formed by casting and rolling of liquid aluminum, the titanium strip is made of pure titanium or titanium alloy, the aluminum strip is one of 1 series pure aluminum, 3 series aluminum alloy, 5 series aluminum alloy and 6 series aluminum alloy, the peeling strength between the titanium strip and the aluminum strip is greater than or equal to 60 N / mm, the tensile strength of the narrow-width titanium-aluminum solid-liquid composite material is greater than or equal to 300 MPa, the yield strength is greater than or equal to 200 MPa, the shear strength of the composite surface is greater than or equal to 180 MPa, and the elongation is greater than or equal to 20%.

2. The titanium-aluminum solid-liquid composite material of claim 1, wherein: The preparation method of the narrow-width titanium-aluminum solid-liquid composite material is as follows: firstly, titanium-aluminum composite strip crude products are obtained by casting and rolling of titanium strips and liquid aluminum, then the titanium-aluminum composite strip crude products are subjected to large deformation heat finish rolling to obtain first-level titanium-aluminum composite strip crude products, the heat finish rolling temperature is 400-600 DEG C, after cooling treatment, small deformation cold finish rolling is performed to obtain second-level titanium-aluminum composite strip crude products, finally, the second-level titanium-aluminum composite strip crude products are straightened and polished to obtain finished products of the narrow-width titanium-aluminum solid-liquid composite material.

3. The titanium aluminide solid-liquid composite of claim 2 wherein: The thickness ratio of the titanium strip to the aluminum strip in the titanium-aluminum composite strip crude product is 1:(2-3).

4. The titanium aluminide solid-liquid composite of claim 2 wherein: The deformation amount of the titanium-aluminum composite strip crude product in the large deformation heat finish rolling process is 50-70%.

5. A narrow-width titanium-aluminum solid-liquid composite material according to claim 2, characterized in that: In the small deformation cold finish rolling process, the cold finish rolling is performed once or twice, and the deformation amount of the first-level titanium-aluminum composite strip crude product in the single cold finish rolling process is less than or equal to 5%.

6. The titanium aluminide solid-liquid composite of claim 2 wherein: The specific preparation method of the titanium-aluminum composite strip crude product is as follows: aluminum alloy is melted to obtain aluminum liquid, the obtained molten aluminum liquid flows out through a forebox and a casting nozzle, contacts a running titanium strip, and is cast and rolled under a casting and rolling machine to form the titanium-aluminum composite strip crude product, the surface roughness of the titanium strip is 1-8 microns, the preheating temperature of the titanium strip is 20-500 DEG C, the casting and rolling speed is 0.5-2.0 m / min, and the roller cooling water flow rate is set to 3000-4000 L / h.

7. The titanium aluminide solid-liquid composite of claim 6 wherein: In the casting and rolling, the temperature of the molten aluminum liquid is 665-700 DEG C, and the casting speed is 0.5-2.0 m / min.

8. The titanium aluminide solid-liquid composite of claim 2 wherein: The specific preparation method of the titanium-aluminum composite strip crude product is as follows: aluminum alloy is melted to obtain aluminum liquid, the obtained molten aluminum liquid flows out through a forebox and a casting nozzle, contacts a running titanium strip, and is cast and rolled under a casting and rolling machine to form the titanium-aluminum composite strip crude product, the surface roughness of the titanium strip is 1-8 microns, the preheating temperature of the titanium strip is 20-500 DEG C, the casting and rolling speed is 0.5-2.0 m / min, and the roller cooling water flow rate is set to 3000-4000 L / h.

9. The titanium aluminide solid-liquid composite of claim 8 wherein: In the casting and rolling, the temperature of the molten aluminum liquid is 665-700 DEG C, and the casting speed is 0.5-2.0 m / min.

10. The titanium aluminide solid-liquid composite of claim 9 wherein: The thickness ratio of the titanium strip to the aluminum strip in the titanium-aluminum composite strip crude product is 1:2.

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