Ultrasonic-assisted interface micro-melting warm rolling method for magnesium / titanium composite plate with large thickness ratio

Abstract

The application belongs to the field of rolling of composite plates, and particularly relates to a large-thickness-ratio magnesium / titanium composite plate ultrasonic-assisted interface micro-melt warm rolling composite method, which comprises the following steps: S3, installing an upper roller heating device above the upper roller and a lower roller heating device below the lower roller, starting the upper roller heating device and the lower roller heating device to respectively rotate and heat the upper roller and the lower roller, starting a rolling mill to make the upper roller and the lower roller rotate at a speed of 1.8-2.4 r / s, making the upper roller and the lower roller have uniform temperature in the circumferential direction, and starting the rolling of the composite plate blank after the upper roller and the lower roller are heated to the specified temperature respectively; the upper roller heating device and the lower roller heating device are used to heat the upper roller and the lower roller respectively, so that the upper roller and the lower roller have a certain temperature, and the temperature of the composite plate blank is prevented from being reduced due to heat dissipation of the upper roller and the lower roller in the rolling deformation area during the rolling of the composite plate, so that the composite forming of the composite plate blank is affected.

Description

Technical Field

[0001] This invention belongs to the field of composite plate rolling, specifically relating to an ultrasonic-assisted interfacial micro-melting warm rolling composite method for magnesium / titanium composite plates with a large thickness ratio. Background Technology

[0002] With the development of aerospace technology, human exploration has reached deep space. New spacecraft place higher demands on the performance of engineering materials, making metal composite plates, which possess the superior properties of various metals, a focus of attention. Magnesium and magnesium alloys, as the lightest metallic structural materials in industrial applications (density approximately 1.74 g / cm³), are particularly noteworthy. 3 Magnesium alloys possess advantages such as good formability, high specific stiffness and strength, and good damping and vibration reduction performance, making them highly promising for applications in high-tech fields. However, their low absolute strength, poor room temperature plasticity, and poor corrosion resistance are bottlenecks hindering their large-scale application. Titanium and its alloys, on the other hand, are lightweight, high-strength, wear-resistant, and corrosion-resistant, and are widely used in aerospace and other highly corrosion-resistant fields. Therefore, by using a thick magnesium alloy as the base layer and an extremely thin titanium alloy as the cladding layer, a high-ratio magnesium / titanium composite plate (magnesium / titanium thickness ratio of 20:1 or higher) can be prepared. This plate possesses the excellent corrosion resistance and surface toughness of titanium alloys with almost no loss of magnesium alloy areal density, making it highly promising for application in aerospace vehicles where density and overall performance requirements are stringent.

[0003] Currently, the main preparation methods for magnesium / titanium composites include explosive bonding, rolling bonding, and diffusion bonding. Explosive bonding utilizes the shock wave generated by an explosion to instantly bond the interface, offering low cost. However, the interface is prone to defects such as cracks and pores under the explosive shock wave, resulting in uneven bonding and potential environmental pollution. Diffusion bonding includes direct solid-state diffusion bonding and instantaneous liquid-phase diffusion bonding. Given the low solid solubility of titanium and magnesium and the absence of intermetallic compound phases, direct solid-state diffusion bonding requires a long time, limiting the size and shape of the product and making it unsuitable for large-scale industrial production. Instantaneous liquid-phase diffusion bonding generates a liquid phase through a eutectic reaction between the parent material and the intermediate layer, achieving bonding through isothermal solidification and composition homogenization of the liquid phase. This method offers significant advantages for joining dissimilar materials like titanium and magnesium, which have low solid solubility and lack intermetallic compound phases. However, limitations in product shape and size, as well as production continuity, remain significant challenges. Hot rolling composite methods for preparing magnesium / titanium composite plates offer advantages such as simple processes, good production continuity, and large product dimensions. However, due to the significant difference in plastic deformation capabilities between titanium and magnesium alloys, bonding is difficult. The high rolling temperatures and large reduction rates (critical reduction rate per pass approximately 40%) easily lead to defects such as warping and uneven thickness in the composite plates. Furthermore, for the preparation of magnesium / titanium composite plates with large thickness ratios, the large reduction rate not only significantly affects the thickness ratio of the finished product but also causes cracking of the extremely thin outer cladding, posing a significant challenge to high-quality composite materials and engineering applications. Therefore, overcoming the size and efficiency limitations of existing preparation technologies to achieve efficient and high-quality bonding of magnesium / titanium composite plates with large thickness ratios has become crucial for promoting the forming and application of this type of layered metal composite material. Summary of the Invention

[0004] This invention addresses the above-mentioned problems by providing an ultrasonic-assisted interfacial micro-melting warm rolling composite method for magnesium / titanium composite plates with a large thickness ratio.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] An ultrasonic-assisted interfacial micro-melting warm rolling composite method for magnesium / titanium composite plates with large thickness ratios includes the following steps:

[0007] S1, pretreatment of billet, specifically includes:

[0008] S11, the thick magnesium alloy plate and titanium strip are annealed, heat-insulated, cleaned and polished to ensure that the thickness of the thick magnesium alloy plate, titanium strip and intermediate foil is uniform and the surface is free of rust.

[0009] S12, cut the thick magnesium alloy plate, titanium strip and intermediate foil into the same length and width respectively, then use sandpaper to polish the thick magnesium alloy plate, titanium strip and intermediate foil respectively, then use acetone to ultrasonically clean the thick magnesium alloy plate, titanium strip and intermediate foil for 15 minutes to remove surface oil, and then use a fan to dry the surface of the plate.

[0010] S13, after cleaning and drying, combines a thick magnesium alloy plate, an intermediate foil, and a titanium strip into a composite slab.

[0011] S2, place the composite slab in a box-type vacuum heat treatment furnace and introduce an inert protective atmosphere to heat the composite slab. After the composite slab is heated to the specified temperature, remove the composite slab.

[0012] S3. Install upper roll heating devices and lower roll heating devices above the upper roll and below the lower roll respectively. Start the upper roll heating devices and lower roll heating devices to rotate and heat the upper roll and lower roll respectively. Start the rolling mill to make the upper roll and lower roll rotate at a speed of 1.8 to 2.4 r / s to make the upper roll and lower roll have uniform temperature in the circumferential direction. After the upper roll and lower roll are heated to their respective specified temperatures, the rolling of the composite slab begins.

[0013] S4. Ultrasonic vibration is applied to the upper and lower rolls by an ultrasonic vibration system. The heated composite slab is fed into the rolling mill. Under the assistance of the ultrasonic vibration system, the composite slab is subjected to one-pass composite rolling to obtain a preliminary high-thickness magnesium / titanium composite plate.

[0014] S5. The initially formed high-thickness magnesium / titanium composite plate is placed in a box-type vacuum heat treatment furnace for furnace cooling. After cooling, it is cut, leveled, polished and cleaned to obtain the final high-thickness magnesium / titanium composite plate product.

[0015] Furthermore, in step S11, the thick magnesium alloy plate is any one of AZ31, AZ61, or AZ80, the intermediate foil is pure Al strip or pure Zn strip, and the titanium strip is any one of TA1, TA2, TC4, TC6, or TC10. The annealing and heat preservation in step S11 involves placing the thick magnesium alloy plate in a box-type vacuum heat treatment furnace and holding it at 300℃~500℃ for 30~60 minutes, and placing the titanium strip in a box-type vacuum heat treatment furnace and holding it at 800℃~1000℃ for 60~90 minutes.

[0016] Furthermore, in step S12, the length of the thick magnesium alloy plate, the intermediate foil, and the titanium strip after cutting is 60–250 mm, and the width is 50–150 mm. Simultaneously, the thickness of the thick magnesium alloy plate is 5–15 mm, the thickness of the intermediate foil is 0.02–0.1 mm, and the thickness of the titanium strip is 0.05–0.2 mm.

[0017] Furthermore, in steps S11, S2, and S5, the box-type vacuum heat treatment furnace must be purged with an argon atmosphere, with an argon pressure of 0.95–1 MPa and an argon purity of 99.99%.

[0018] Furthermore, in step S2, the heating temperature of the box-type vacuum heat treatment furnace is 350–550°C, and the holding time is 10–30 min.

[0019] Furthermore, in step S3, the normal distance between the induction coil in the upper roll heating device and the upper roll and the normal distance between the induction coil in the lower roll heating device are both 3-5 mm, and the frequency of the induction heating power supply in the upper roll heating device and the lower roll heating device is 1000-2000 Hz, and the current density is 30-100e5A / m2.

[0020] Furthermore, in step S3, the upper and lower rolls are heated at different temperatures. The roll near the titanium strip is heated to 400-500°C, and the roll near the thick magnesium plate is heated to 200-300°C, thus creating a specific temperature difference.

[0021] Furthermore, in step S4, the vibration frequency of the ultrasonic vibration system is 15-30kHz, the amplitude is 5-15μm, the reduction rate of one-pass composite rolling is 5%-15%, and the rolling speed is 0.01-0.05m / s.

[0022] Furthermore, in step S5, the furnace cooling temperature is 300℃~500℃, and the time is 30~90min.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] This invention applies ultrasonic vibration to the upper and lower rolls during the rolling and bonding process of thick magnesium / titanium composite plates using an ultrasonic vibration system. Under suitable eutectic temperature range and vibration / rolling force, the oxide film on the surfaces to be bonded to the thick magnesium alloy plate and titanium strip is broken up. The high-strength bonding of the thick magnesium alloy plate and titanium strip is achieved by using the intermediate foil material to undergo element diffusion, low-melting-point eutectic reaction and isothermal solidification with the thick magnesium alloy plate and titanium strip, thus realizing dynamic and continuous rolling of thick magnesium / titanium composite plates.

[0025] This invention significantly accelerates the eutectic reaction and element diffusion through ultrasonic vibration, resulting in uniform composition of the bonding interface, refined grains, and shortened phase transformation time. This improves the bonding interface stability and mechanical properties of high-thickness-ratio magnesium / titanium composite plates, inhibits cracking of the composite plates, and significantly improves the quality of high-thickness-ratio magnesium / titanium composite plates.

[0026] This invention heats the upper and lower rolls separately using an upper roll heating device and a lower roll heating device, ensuring that the upper and lower rolls have a certain temperature. This prevents the temperature of the composite slab from dropping due to heat dissipation from the upper and lower rolls in the rolling deformation zone during composite rolling, which would affect the composite forming of the composite slab. At the same time, the temperature of the upper and lower rolls can be controlled independently, allowing the upper and lower rolls to generate specific temperature differences. This ensures the temperature gradient in the thickness direction while providing additional heat to the composite slab, indirectly adjusting the temperature distribution in the bonding and non-bonding areas of the composite slab.

[0027] This invention utilizes ultrasonic-assisted interfacial micro-melting warm rolling to composite high-thickness magnesium / titanium composite plates, avoiding the problems of large thickness ratio loss, cracking of the cladding titanium strip, and high requirements for rolling mill performance caused by the large reduction rate and rolling force required by traditional rolling methods. It also provides an alternative to the diffusion composite method, which suffers from low preparation efficiency and small finished product size, and achieves high-quality rolling composite of high-thickness magnesium / titanium composite plates with small reduction and dynamic continuity.

[0028] This invention can use different materials for the intermediate layer foil to achieve different interfacial bonding strengths as needed, thus enabling customized development;

[0029] This invention utilizes the acoustic flow and cavitation effect of ultrasonic vibration to break the oxide film on the surface of thick magnesium alloy plates and titanium strips, and extrudes excess eutectic liquid phase to reduce the thickness of the intermediate foil, thereby achieving rapid and effective connection in an atmospheric environment. During rolling composite, it can reduce forming load, improve the forming performance of high-thickness magnesium / titanium, improve the surface quality of composite slabs, and significantly reduce residual stress generated during composite forming. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the device of the present invention;

[0031] Figure 2 This is a microscopic schematic diagram of the composite interface of the high-thickness-ratio magnesium / titanium composite plate product in Embodiment 1 of the present invention;

[0032] Figure 3 This is a microscopic schematic diagram of the composite interface of the high-thickness-ratio magnesium / titanium composite plate product in Embodiment 2 of the present invention;

[0033] In the diagram, ultrasonic vibration system-1 and rolling mill-2 are shown. Detailed Implementation

[0034] To further illustrate the technical solution of the present invention, the present invention will be further described below through embodiments.

[0035] Example 1

[0036] S1, pretreatment of billet, specifically includes:

[0037] S11, AZ31 magnesium alloy thick plate, TC4 titanium strip and 1060 aluminum foil are annealed, heat-preserved and cleaned and polished to ensure that the thickness of AZ31 magnesium alloy thick plate, TC4 titanium strip and 1060 aluminum foil is uniform and the surface is free of rust; the annealing and heat preservation are carried out by placing AZ31 magnesium alloy thick plate in box-type vacuum heat treatment furnace and holding it at 300℃ for 45min, and placing TC4 titanium strip in box-type vacuum heat treatment furnace and holding it at 800℃ for 60min.

[0038] S12, cut AZ31 magnesium alloy thick plate, TC4 titanium strip and 1060 aluminum foil into the same length and width, with length and width of 80mm and 50mm respectively, and thickness of 8mm, 0.1mm and 0.03mm respectively. Then, use sandpaper to polish AZ31 magnesium alloy thick plate, TC4 titanium strip and 1060 aluminum foil respectively. After that, use acetone to ultrasonically clean the thick magnesium alloy plate, titanium strip and intermediate foil for 15 minutes to remove surface oil. Then use a fan to dry the surface of the board.

[0039] S13, after cleaning and drying, combine AZ31 magnesium alloy thick plate, TC4 titanium strip and 1060 aluminum foil into a composite slab.

[0040] S2. Place the composite slab in a box-type vacuum heat treatment furnace and introduce an argon atmosphere with an argon pressure of 1 MPa and an argon purity of 99.99%. Heat the composite slab to a temperature of 550℃ and hold it for 10 minutes. Once the composite slab has been heated to the specified temperature, remove it from the furnace.

[0041] S3, an upper roll heating device and a lower roll heating device are installed above the upper roll and below the lower roll, respectively. The normal distance between the induction coil of the upper roll heating device and the normal distance between the induction coil of the lower roll heating device and the lower roll heating device is 3mm. The frequency of the induction heating power supply in the upper roll heating device and the lower roll heating device is 1000Hz, and the current density is 50e. 5 A / m 2The upper and lower roll heating devices are started to rotate and heat the upper and lower rolls respectively. The rolling mill is started to rotate the upper and lower rolls at a speed of 1.8 r / s to make the temperature of the upper and lower rolls uniform in the circumferential direction. The rolling temperature of the rolls near the titanium strip is 400℃, and the rolling temperature of the rolls near the thick magnesium plate is 200℃. After the upper and lower rolls are heated to their respective designated temperatures, the rolling of the composite slab begins.

[0042] S4. Ultrasonic vibration is applied to the upper and lower rolls through an ultrasonic vibration system. The heated composite slab is fed into the rolling mill. Under the assistance of the ultrasonic vibration system, the composite slab is subjected to one-pass composite rolling to obtain a pre-formed high-thickness magnesium / titanium composite plate. The vibration frequency of the ultrasonic vibration system is 20kHz, the amplitude is 15μm, the reduction rate of one-pass composite rolling is 5%, and the rolling speed is 0.01m / s.

[0043] S5. The initially formed high-thickness magnesium / titanium composite plate is placed in a box-type vacuum heat treatment furnace for furnace cooling at a temperature of 300℃ for 30 minutes. After cooling, it is cut, leveled, polished and cleaned to obtain the final high-thickness magnesium / titanium composite plate product.

[0044] Interface observation was performed on the high-thickness-ratio magnesium-titanium composite plate prepared in this embodiment, such as... Figure 2 As shown in the figure, the composite plate has a large thickness ratio and good interfacial bonding quality. There is a eutectic layer between the upper titanium strip and the lower magnesium plate. The thickness of the eutectic layer is uneven, which is mainly due to the extrusion effect during the rolling process.

[0045] Example 2

[0046] S1, pretreatment of billet, specifically includes:

[0047] S11, AZ61 magnesium alloy thick plate, TC6 titanium strip and zinc foil are annealed, heat-preserved and cleaned and polished to ensure that the thickness of AZ61 magnesium alloy thick plate, TC6 titanium strip and zinc foil is uniform and the surface is free of rust; the annealing and heat preservation are carried out by placing AZ61 magnesium alloy thick plate in box-type vacuum heat treatment furnace and holding it at 400℃ for 50min, and placing TC6 titanium strip in box-type vacuum heat treatment furnace and holding it at 900℃ for 60min.

[0048] S12, cut AZ61 magnesium alloy thick plate, TC6 titanium strip and zinc foil into the same length and width, with length and width of 80mm and 50mm respectively, and thickness of 8mm, 0.1mm and 0.03mm respectively. Then, use sandpaper to polish AZ61 magnesium alloy thick plate, TC6 titanium strip and zinc foil respectively. After that, use acetone to ultrasonically clean the thick magnesium alloy plate, titanium strip and intermediate foil for 15 minutes to remove surface oil. Then use a fan to dry the surface of the plate.

[0049] S13, after cleaning and drying, combine AZ61 magnesium alloy thick plate, TC6 titanium strip and zinc foil into a composite slab.

[0050] S2. Place the composite slab in a box-type vacuum heat treatment furnace and introduce an argon atmosphere with an argon pressure of 1 MPa and an argon purity of 99.99%. Heat the composite slab to a temperature of 550℃ and hold it for 10 minutes. Once the composite slab has been heated to the specified temperature, remove it from the furnace.

[0051] S3, an upper roll heating device and a lower roll heating device are installed above the upper roll and below the lower roll, respectively. The normal distance between the induction coil of the upper roll heating device and the normal distance between the induction coil of the lower roll heating device and the lower roll heating device is 5mm. The frequency of the induction heating power supply in the upper roll heating device and the lower roll heating device is 1500Hz, and the current density is 80e. 5 A / m 2 The upper and lower roll heating devices are started to rotate and heat the upper and lower rolls respectively. The rolling mill is started to rotate the upper and lower rolls at a speed of 2 r / s to make the temperature of the upper and lower rolls uniform in the circumferential direction. The rolling temperature of the rolls near the titanium strip is 450℃, and the rolling temperature of the rolls near the thick magnesium plate is 300℃. After the upper and lower rolls are heated to their respective specified temperatures, the rolling of the composite slab begins.

[0052] S4. Ultrasonic vibration is applied to the upper and lower rolls through an ultrasonic vibration system. The heated composite slab is fed into the rolling mill. Under the assistance of the ultrasonic vibration system, the composite slab is subjected to one-pass composite rolling to obtain a pre-formed high-thickness magnesium / titanium composite plate. The vibration frequency of the ultrasonic vibration system is 20kHz, the amplitude is 15μm, the reduction rate of one-pass composite rolling is 5%, and the rolling speed is 0.01m / s.

[0053] S5. The initially formed high-thickness magnesium / titanium composite plate is placed in a box-type vacuum heat treatment furnace for furnace cooling at a temperature of 400℃ for 60 minutes. After cooling, it is cut, leveled, polished and cleaned to obtain the final high-thickness magnesium / titanium composite plate product.

[0054] Interface observation was performed on the high-thickness-ratio magnesium-titanium composite plate prepared in this embodiment, such as... Figure 3 As shown in the figure, the composite plate has good interfacial bonding quality, with a Mg-Zn eutectic layer between the upper titanium strip and the lower magnesium plate, and the thickness of the eutectic layer is relatively uniform.

[0055] Example 3

[0056] S1, pretreatment of billet, specifically includes:

[0057] S11, AZ80 magnesium alloy thick plate, TC10 titanium strip and 1235 aluminum foil are annealed, heat-preserved and cleaned and polished to ensure that the thickness of AZ80 magnesium alloy thick plate, TC10 titanium strip and 1235 aluminum foil is uniform and the surface is free of rust; the annealing and heat preservation are carried out by placing AZ80 magnesium alloy thick plate in box-type vacuum heat treatment furnace and holding it at 500℃ for 60min, and placing TC10 titanium strip in box-type vacuum heat treatment furnace and holding it at 1000℃ for 80min.

[0058] S12, cut AZ80 magnesium alloy thick plate, TC10 titanium strip and 1235 aluminum foil into the same length and width, with length and width of 80mm and 50mm respectively, and thickness of 8mm, 0.1mm and 0.03mm respectively. Then, use sandpaper to polish AZ80 magnesium alloy thick plate, TC10 titanium strip and 1235 aluminum foil respectively. After that, use acetone to ultrasonically clean the thick magnesium alloy plate, titanium strip and intermediate foil for 15 minutes to remove surface oil. Then use a fan to dry the surface of the board.

[0059] S13, after cleaning and drying, combine AZ80 magnesium alloy thick plate, TC10 titanium strip and 1235 aluminum foil into a composite slab.

[0060] S2. Place the composite slab in a box-type vacuum heat treatment furnace and introduce an argon atmosphere with an argon pressure of 1 MPa and an argon purity of 99.99%. Heat the composite slab to a temperature of 550℃ and hold it for 10 minutes. Once the composite slab has been heated to the specified temperature, remove it from the furnace.

[0061] S3, an upper roll heating device and a lower roll heating device are installed above the upper roll and below the lower roll, respectively. The normal distance between the induction coil of the upper roll heating device and the normal distance between the induction coil of the lower roll heating device and the lower roll heating device is 5mm. The frequency of the induction heating power supply in the upper roll heating device and the lower roll heating device is 2000Hz, and the current density is 100e. 5 A / m 2The upper and lower roll heating devices are started to rotate and heat the upper and lower rolls respectively. The rolling mill is started to rotate the upper and lower rolls at a speed of 2.4 r / s to make the temperature of the upper and lower rolls uniform in the circumferential direction. The rolling temperature of the rolls near the titanium strip is 500℃, and the rolling temperature of the rolls near the thick magnesium plate is 300℃. After the upper and lower rolls are heated to their respective designated temperatures, the rolling of the composite slab begins.

[0062] S4. Ultrasonic vibration is applied to the upper and lower rolls through an ultrasonic vibration system. The heated composite slab is fed into the rolling mill. Under the assistance of the ultrasonic vibration system, the composite slab is subjected to one-pass composite rolling to obtain a pre-formed high-thickness magnesium / titanium composite plate. The vibration frequency of the ultrasonic vibration system is 20kHz, the amplitude is 15μm, the reduction rate of one-pass composite rolling is 5%, and the rolling speed is 0.01m / s.

[0063] S5. The initially formed high-thickness magnesium / titanium composite plate is placed in a box-type vacuum heat treatment furnace for furnace cooling at a temperature of 500°C for 80 minutes. After cooling, it is cut, leveled, polished and cleaned to obtain the final high-thickness magnesium / titanium composite plate product.

[0064] The foregoing has shown and described the main features and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0065] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An ultrasonic-assisted interfacial micro-melt warm rolling compounding method for a large thickness ratio magnesium / titanium composite plate, characterized in that: The method comprises the following steps: S1, blank pre-treatment, specifically comprising: S11, annealing and holding, cleaning and polishing treatment are respectively performed on the large-thickness magnesium alloy plate and the titanium strip to ensure that the large-thickness magnesium alloy plate, the titanium strip and the intermediate layer foil are uniform in thickness and free of rust on the surface; S12, the large-thickness magnesium alloy plate, the titanium strip and the intermediate layer foil are cut into the same length and width, and then the large-thickness magnesium alloy plate, the titanium strip and the intermediate layer foil are polished using sandpaper, and then the large-thickness magnesium alloy plate, the titanium strip and the intermediate layer foil are cleaned in acetone for 15 minutes using ultrasonic waves to remove surface oil stains, and then the surface of the plate is dried using a fan; S13, after cleaning and drying, the large-thickness magnesium alloy plate, the intermediate layer foil and the titanium strip are combined into a composite plate blank; S2, the composite plate blank is placed in a box-type vacuum heat treatment furnace, and an inert protective atmosphere is introduced, the composite plate blank is heated, and the composite plate blank is taken out after the composite plate blank is heated to a specified temperature; S3, an upper roller heating device and a lower roller heating device are respectively installed above the upper roller and below the lower roller, the upper roller heating device and the lower roller heating device are started, the upper roller and the lower roller are respectively rotated and heated, the rolling mill is started, the upper roller and the lower roller are rotated, the rotating speed is 1.8-2.4 r / s, the temperature of the upper roller and the lower roller is uniform in the circumferential direction, and the rolling of the composite plate blank is started after the upper roller and the lower roller are heated to the specified temperature respectively; S4, the ultrasonic vibration system is used to apply ultrasonic vibration to the upper roller and the lower roller, the heated composite plate blank is sent into the rolling mill, and one-pass composite rolling of the composite plate blank is performed under the assistance of the ultrasonic vibration system to obtain a preliminarily formed large-thickness magnesium / titanium composite plate; S5, the preliminarily formed large-thickness magnesium / titanium composite plate is placed in a box-type vacuum heat treatment furnace for furnace cooling, and after the cooling is completed, the preliminarily formed large-thickness magnesium / titanium composite plate is cut, leveled, polished and cleaned to obtain a final large-thickness magnesium / titanium composite plate product.

2. The ultrasonic-assisted interfacial micro-melt warm roll bonding method of claim 1, wherein: The large-thickness magnesium alloy plate in the step S11 is any one of AZ31, AZ61 or AZ80, the intermediate layer foil is a pure Al strip or a pure Zn strip, the titanium strip is any one of TA1, TA2, TC4, TC6 or TC10, and the annealing and holding in the step S11 is that the large-thickness magnesium alloy plate is placed in a box-type vacuum heat treatment furnace and held at 300-500 DEG C for 30-60 min, and the titanium strip is placed in a box-type vacuum heat treatment furnace and held at 800-1000 DEG C for 60-90 min.

3. The ultrasonic-assisted interfacial micro-melt warm roll bonding method of claim 1, wherein: The length of the large-thickness magnesium alloy plate, the intermediate layer foil and the titanium strip after cutting in the step S12 is 60-250 mm, the width is 50-150 mm, the thickness of the large-thickness magnesium alloy plate is 5-15 mm, the thickness of the intermediate layer foil is 0.02-0.1 mm, and the thickness of the titanium strip is 0.05-0.2 mm.

4. The ultrasonic-assisted interfacial micro-melt warm roll bonding method of claim 2, wherein the magnesium / titanium composite plate has a large thickness ratio. Argon atmosphere needs to be introduced into the box-type vacuum heat treatment furnace in the steps S11, S2 and S5, the argon gas pressure is 0.95-1 MPa, and the mass purity of the argon is 99.99%.

5. The method according to claim 1, wherein the method is characterized by: The heating temperature of the box-type vacuum heat treatment furnace in the step S2 is 350-550 ℃, and the holding time is 10-30 min.

6. The method according to claim 1, wherein the method is characterized by: The normal distance between the induction coil in the upper roller heating device and the upper roller is 3-5 mm, and the normal distance between the induction coil in the lower roller heating device and the lower roller is 3-5 mm. 5 A / m 2 .

7. The method according to claim 1, wherein the method is characterized by: In the step S3, the upper and lower rollers are heated at different temperatures, the heating temperature of the roller close to the titanium strip side is 400-500 ℃, and the heating temperature of the roller close to the magnesium plate side is 200-300 ℃, so that a temperature difference is generated.

8. The ultrasonic-assisted interfacial micro-melt warm roll bonding method of claim 1, wherein: In the step S4, the vibration frequency of the ultrasonic vibration system is 15-30 kHz, the amplitude is 5-15 μm, the reduction rate of one-pass composite rolling is 5%-15%, and the rolling speed is 0.01-0.05 m / s.

9. The method according to claim 1, wherein the method is characterized by: In the step S5, the temperature of the furnace cooling is 300 ℃-500 ℃, and the time is 30-90 min.

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